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Aquaculture - Science topic

Explore the latest questions and answers in Aquaculture, and find Aquaculture experts.
Questions related to Aquaculture
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I am looking for some studies where they have used this technology in aquaculture and worked with live animals. I am trying to see if I can use this technology inside water.
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Thank you for the suggestion and references Mariana. I appreciate your help. I will take a look into it.
Thank you..
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Hi!
I'm in the initial phase of my PhD in aquaculture and this is the phase of isolating the bacterial strain that I'm going to work with. I'm trying to isolate a bacteria (Rubrivivax gelatinosus) from the water in Pfennig media, but my sample is contaminating with different fungi strains. Do you know which antifungal I can add to the culture medium to purify my bacterial strains?
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Hi!!!
In my research i used chloramphenicol to prevent unwanted fungal and bacterial growth and u can also use cyclohixamind
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Dear Scholars/Scientists/Researchers,
What is the genus name of white leg shrimp? Some authors state species name as Litopenaeus vannamei and some as Penaeus vannamei? Are these two names of the same species?
Thank you for your answers.
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Whiteleg shrimp (Litopenaeus vannamei, synonym Penaeus vannamei), also known as Pacific white shrimp or King prawn, is a species of prawn of the eastern Pacific Ocean commonly caught or farmed for food.
Whiteleg shrimp - Wikipedia
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Land use Classifications of different types of water bodies through hyperspectral data.
Can i distinguish Coastal waters, inland waters, ponds, and inland aquaculture?
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Yes. A review of hyperspectral remote sensing and its application in vegetation and water resource studies
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I'm interested in how different concentrations of vitamins might affect the fish. I have many different brands of food that I would like to test. Vitamins are usually shown as either IU/kg or IU/g but the values between diets that are supposed to be similar are very different. For example, my understanding is that if one of my diets says 1000 IU/kg that means that 1kg of feed will have 1000 IU of vitamin A. Another one of my diets says 30 IU/g so that means that in 1000g (1kg) I would find 3000 IU.
Am I correct? I ask because I would like to be able to convert these values to the same units to be able to compare them. Thank you.
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David Guerra ..... It is more common to get the confusion with regard to the unit used for some of the vitamins (vit A, D E, etc) and a few Minerals when they are added with the feed. For better understanding of this myth, it is better to keep the following points in mind:
1. IU stands for International Unit, which is totally different from Mg or Mcg... or any measurable mass or volume
2. IU is not to be measured by mass or weight or volume, rather it is used to denote the effect or impact of the particular component at that specific IU
3. IU can be converted to Mg or Mcg.. vice-versa is also possible.. But to be clear that when IU is to be converted to Mg or Mcg, it has to be divided by the Conversion Factor, while the Mg or Mcg is converted to IU, it has to be multiplied by the Conversion Factor...
4. Now it must be clear that, for knowing the volume to be added or incorporated, each IU should be dived by the Conversion Factor to get the Mg or Mcg equivalent.
5. More important point is that each ingredient bearing IU will have different Conversion Factor, e.g., Vit A - Retinol will have a CF different from Beta Carotene... Therefore depending on the ingredient, the CF has to be applied and used.
In extract, it has to be borne in mind that IU is a measure of biological activity of that particular substance and is specific to each substance in a class or group of substances named with the same title...
Hope the above might be of some use to get a clarification...
Dr js....
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I am reading about pilot projects of seed production of Ostrea edulis, found only some abstract from old paper mentioning north Spain, but I don't know if it is actually working in the mariculture companies on the Med.
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Sustainable large‐scale production of European flat oyster ...
https://onlinelibrary.wiley.com › doi › full › raq
by B Colsoul · 2021
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Despite the high quality of fish-based ingredients in aquafeeds, reported unsustainability caused by their use in aquaculture, have raised global concerns and effort for replacing them.
Among the potential candidates ( insect meal & oil vs plant meal & oil vs microalgae meal & oil : Spirulina , Chlorella, etc. ), which ones have no side effects or don’t generate new environmental impacts ?
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Kindly, share info about Mobile Apps used in Aquaculture and their functions. Thank you very much in advance!
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Do humans who eat food prepared in a restaurant face a higher risk of contracting an illness than those who eat packaged food?
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Thanks for nice question and very well answered by Prof Barbara, would like to add that : Food can be contaminated when it is handled, stored or prepared incorrectly!, Care in processing, transport, storage, preparing and serving of food is necessary to reduce the risk of contamination. The holistic approach of your question should be investigated in each country due to their own conditions probably.
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We have procured metronidazole powder ( active ingredient) for an aquaculture experiment. The purpose is to study the effect of metronidazole on gut flagellates. But we have a problem with dissolving metronidazole in pure water.
Could someone suggest how it could be done?
Regards
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It is only slightly soluble in pure water. However, it is soluble in acidic solutions (at pH 1.2). Read the article below
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Does anyone know a full list of genetically modified (GM) farmed fish species?
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Also, kindly check:
Sustainable use of CRISPR/Cas in fish aquaculture: the biosafety perspective
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The use of synthetic hormones for fish sex reversal has led to environmental concerns.
Is the use of phytohormones a sustainable solution?
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Based on the following link it has been concluded that the use of phytochemicals as a viable alternative to 17-methyltestosterone in the production of monosex tilapia an economically important food fish holds a great prospect:
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Please suggest island based topic
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I am also agreed with Erick Arturo Betanzo Torres. Priorities for the next decade should be considered. However, aquaculture and fisheries represent a wide disciplines with diversified research scopes. Every aspects such as nutrition, water quality, fish health etc are most important to address. Nature should be protected to conserve our aquatic biodiversity including environmental issues.
Aquaculture of high yielding and high value species also is the need of future decades, because, if we would be able to supply sufficient aquatic product from aquaculture, it will support to conserve and manage the natural biodiversity.
We should have some innovative as well as climate smart technologies to increase the growth and production of warm water fish even from cold climatic area, because the price of warmwater fish is relatively lower than coldwater species and it will support to easy access of people having general/lower income level and enhance the small scale aquaculture.
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"The development and validation of a medium density SNP genotyping assay in Shrimp" is a research proposal I'm currently working on. Given the restricted budget allotted (9,600 USD) to the project, I'd like to know ahead of time how much it might probably cost me.
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sorry
outside my area of expertise
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Hi. By reference of a book I am looking for the aquaCalc 1.0 software. It is to facilitate the calculations of an aquaculture facility. I already have the user manual (1998), is it possible to get the software in some way? Anyone know him?
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Hello, Tzachi. Bill Manci and I (FTAI.com) are interested in the latest version of the WQ Map which we think might work well in a freshwater aquaponic facility we are assisting development of. Do you have any suggestions?
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1.list of scopus journals in fisheries and Aquaculture
2.list of WoS journals in fisheries and Aquaculture
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Best aquatic science journals that are scopus indexed-
Hope it helps. All the best.
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new research trends and gaps in fisheries marketing and economics
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Dear D.W. L.U. De Silva,
I propose the following research topic in the field of marketing and fisheries economics: Improving research techniques for marine fish populations and ocean ecosystems with the use of new ICT information technologies, Industry 4.0 and satellite technologies. Analysis of the state of fish populations in the seas and oceans, taking into account the issues of sustainability analysis, protection of the biosphere of marine and ocean ecosystems, implementation of the sustainable development goals and green economy. Analysis of determinants of the possibility of increasing expenditures and the scale of social campaigns with the use of new online media, including social media portals promoting the idea of ​​sustainability, protection of the biosphere of marine and ocean ecosystems, implementation of sustainable development goals, green circular economy, social environmental responsibility, reduction of greenhouse gas emissions e.t.c.
Best regards,
Dariusz
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There is a fresh water source with around 80 mg/L of Calcium to be used for Salmon farming (onshore) in an industrial large scale. As you know, at this level the water is moderately hard. Do you think this amount of Calcium (80 mg/l) is detrimental to fish (Alevin, Parr, or Smolt)? How about its effects on scaling or clogging the pipes and heat exchangers and so on?
If yes, which method would you suggest to eliminate/remove Calcium economically feasible: chemical precipitation, membrane separation, ion exchange, inhibiting scaling, or ....?
(As we know, there are many reports on the benefit of Calcium at low levels (10 mg/L) in fish hatchery, but could not find any reliable source for higher levels of hardness).
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Foliow
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I am making a research on the above topic and would like to know what I should look out for. Topic- Is inconsistency in government policies and poor regulations affecting the aquaculture development in Nigeria?. 
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I don't know anything about Nigeria, but in India, it does.
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I'm at the last year at college of aquaculture and I wanna know ideas for graduation project topics about aquaculture, fish feed processing, fish products and so on.
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You should study only in the area you like most. Also your institution has to have the facilities. As aquaculture is a promising field , it has lots of opportunities. The area that warrants more research are aquaponics, prebiotic or probiotic in feed, RAS etc.
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Dear acquaintances,
Anybody with an experience of farming of both Penaues monodon and Penaeus vannamei together. What will be the economics ?? Require expert opinions!!!
Thanks in advance.
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I did not do that. But I am not positive about that because
1- the difference in dietary requirement between these two shrimp. Monodon needs higher dietary protein than vannamei. You can not feed them separately, instead you should a single diet for them both. Low protein causes health deterioration in monodon and high protein increase ammonia production by vannamei.
2- monodon is an aggressive species and will show antagonostic behaviors toward other species. I guess high mortality in cannamei may occur
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Hi ,
I am doing a study on the valuation of quinoa and its co-products in fish feed, I would like to know how you eliminate saponin.
Thanks
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Pls give some highlights on Integrated Aquaculture
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Under IMTA production, the uneaten feed and wastes of one species are recaptured and converted into feed, fertilizers, and energy to another species. IMTA can promote aquaculture sustainability, with environmental, economic, and social advantages. https://www.frontiersin.org/articles/10.3389/fmars.2020.00156/full
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Dear Researchers,
I need the latest statistical information of both marine and inland (fisheries production and aquaculture) by country. I would be very happy if you share this information. Thank you so much,
Sincerely.
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Dear Yavuz,
Do you need more information than is available from the FAO statistics?
They are quite comprehensive and something of a "gold standard"
Martyn
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I have what I believe to be several novel species of parasites, including some type of predatory marine isopod, that infected the Florida aquarium aquaculture supply chain. I have searched existing scientific literature and have found nothing that describes that species I have in my possession. They are incredibly hard to kill, and can live in soap, survive low concentrations of bleach, vinegar, and 3% hydrogen peroxide. Some of these parasites have translucent exoskeletons and burrow beneath the substrate to ambush prey using some type of proboscis to extend out of the substrate. Others lack an exoskeleton and instead are fluid, able to change shape to camouflage within plants or macroalgae, fit into empty shells, or attach to gastropods like hermit crabs and snails bodies and either kill them to eat immediately, allow them to live while attached to them, or lay their eggs within them to burst out at a later when conditions are suitable. They also seem to be able to use parts of their prey that they don't eat as parts of their own body. I have a 10 gallon tank filled with a wide variety of these parasites and a 2.5 gallon tank filled with what I think is a single isolated species of this parasite that burst out of a single hermit crab's abdomen. I also saved the cleaning supplies that these parasites managed to burrow into, some that were filled with soap. I do not have the expertise or equipment to properly identify these parasites or study them in any way besides direct observation. Would any researcher want to obtain these samples for study? I can give you more details on the parasite's specific behaviors and appearance if desired. Based on how fast these parasites reproduce and how quickly they can wipe out an entire aquarium, I believe that these species should be studied properly not only to identify and describe their species, but to also start to find ways to kill them without killing everything else in the tank. I have received similar types of parasites from 2 different Floridian aquaculture companies inadvertently and I fear that these parasites may have already infiltrated the aquarium supply chain. Therefore, it is important that these parasites be studied so that the economic damage they have the potential to bring to the aquarium aquaculture industry can be mitigated. Please feel free to call my at 763-245-9880 or email me at robic018@umn.edu if you wish to learn more or figure out the logistics of getting these samples to you.
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Yes Fasciola gigantica and Fasciola hepatica larvae were found in snails Radix acuminata in aquatice medium.
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The aquaculture industry's endeavour to avoid diseases casing microbes/carrier/macro predator to keep the farm-reared animals healthy to achieve good profit in the aquaculture business. Has the subsurface intake system has the ability to solve this problem?
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I am aiming to determine the ADC values of a commercial fish feed, but I do not have a steam pelleter or extruder available to me. Ideally, the pellets could be coated with some inert marker.
Does anyone know of a type of marker that can be used like this in Nile tilapia?
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You could use endogenous markers in feed such as Acid Insoluble Ash or Hydrolysis resistant organic matter.
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I could find treatment strategy or guidelines on humans but not on fishes. Could you suggest me some related to fishes?
Thank you
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Dear all,
we are trying to improve the representation of land use information in the regional climate model WRF for 1. aquaculture and 2. rice paddies in the Mekong River region (Vietnam). The major question is which existing land use class (from MODIFIED_IGBP_MODIS_NOAH classification) corresponds best to those?
If none of the predefined classes is suitable, we could add new classes to the LANDUSE.TBL, but we would need the parameters from experiments or from literature, i.e. albedo (ALBD %), soil moisture (SLMO × 100%), surface emissivity (SFEM %), surface roughness length (SFZ0 × 10 −2 m), thermal inertia (THERIN × 4.184 × 10 2 J/m 2 Ks 1/2 ), and surface heat capacity (SFHC × 10 6 J/m 3 K) for aquaculture and rice paddies, respectively.
Thank you very much for all kind of helpful suggestions.
Cheers, Patrick
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Please see the attached file if it is helpful:
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What are the most relevant SMART objectives to propose for monitoring aquaculture projects (finfish and shellfish hatcheries and also on growing in coastal ecosystems)?
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App based monitoring of different parameters can be an effective approach
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I am growing biofilms for some aquaculture work, and I need to send the biofilm samples off for bacterial DNA analysis. What is the best way to preserve biofilms so they can be shipped to another lab? The biofilms are from seawater and adult sea urchins. Thanks in advance.
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Hi All friends and researcher in the world , supporting me by your opinion , if you have studies , information
Will the rapid expansion of aquaculture and its demand for fish meal and fish oil threaten wild fish stocks?
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Wild fish can't easily threatened. Because of enormous amount. Only a few rare species which lives in limited environment!
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We are conducting a respirometer trial with salmonids and want to access SDA variables in relation to temperature. We are wondering, if we can measure the Maximum metabolic rate (MMR) and the SDAcoefficient at the same time? We believe, measuring the MMR would add oxygen consumption, that is not directly related to SDA, but we would love to have the MMR as a measurement of potential growth. Is there a way, to measure both (e.g. by Q10 values, SDA values)?
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Hi Philipp, I would advise against measuring these variables (MMR and SDA) at the same time. In my experience, I believe this would confound your results. MMR is the maximum metabolic rate attainable, and it is already affected by numerous other parameters such as temperature and hypoxia, for example (see ). With SDA, you have a lot of variables you could measure (such as peak metabolic rate during SDA, SDA duration, SDA factorial scope, etc.). When you are studying aerobic contributions to SDA, it is best to have the fish moving as little as possible. I've recently published some work on SDA in salmonids (brook charr), hopefully you will find the methodology helpful.
If the goal is to measure both of these, I would recommend measuring MMR first, letting the fish return to SMR, then beginning your SDA trials.
Best wishes,
Nicole
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Hi All , If you have or information for Aquaculture or Aquaculture farming Standards in your country Can help to putting as world Aquaculture Standers for all country .
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Agree with Amin Marandi.
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Can anyone tell me or share any papers that would explain what's the benefit (or maybe a disadvantage) of a metagenic life cycle in jellyfish cultivation?
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Suggestions for India’s Blue Economy
This is regarding India’s Blue Economy Policy. We are happy to see lot detailed information on India’s Blue economy Policy. Definitely we can get good economy from our oceanic region by promoting mariculture activities and other related aspects. We like to add some suggestions under Marine Fisheries, Aquaculture and Increasing sustainable marine capture fisheries.
Artificial reef deployment and Fish Aggregating Devices : Based on our NIOT experience in the following projects, Artificial reef deployment including High rise artificial reef and Fish Aggregating Devices for Tuna fishing, we can strongly recommend Artificial reef is the best method of restoration of marine biodiversity and to create new fishing grounds and the same artificial structures can protect the coast from cyclone or Tsunami when deployed in deep waters near coast.
Fish Aggregating Devices will also be helpful to increase the marine resources in our ocean waters apart from Tuna fishing in deep sea areas.
Artificial Floating Islands or Multipurpose floating platforms: Mariculture is the best method for marine conservation and to utilize the ocean surface for our economy. But due to heavy waves and rough sea in our Indian coast, we can’t carry intensively. By creating Artificial floating Islands or Multipurpose floating platforms, we can perform more open sea cage aquaculture and other related Ocean activities like Ocean Energy, desalination plants and Deep sea ports etc
Island Development: When comparing with main land coastal region, Andaman and Nicobar coast is more suitable for mariculture activites, so we should concentrate more on Islands for this kind development.
Integrated Mariculture : Further our approach should be Integrated farming by including seaweed and other marine organisms like bivalves near the open sea cage aquaculture to get full benefits by utilizing organic waste or nutrients released from fish feed waste and excretion.
Sea ranching: The old method of sea ranching should be considered to restore the marine organisms and conservation
Monitoring Marine Bioinvasion for Ocean Health; Prevention of marine bioinvasion is important in near future to maintain ocean health and that should be monitored, because that also one kind biological pollution. Already NIOT is working on Ballast Water Treatment Technology Test Facility to minimize bioinvasion.
Tuna Research Centre: Under Deep Sea Mission we can promote Tuna Research Centre for Tuna fishing and deep sea fishing.
Alternative Jobs to fishermen community: Alternative job and other related training must be encouraged to avoid more people depend on marine natural resources for their livelihood to minimize the degradation or total loss of biological resources
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An important national development issue, indeed.
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Hi all,
I would need to quantify amino acids present in hepatic vein of a fish. Do I also need to record the blood pressure to get the exact AA levels in the fish blood?
Thanks.
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Hi,
This type of leech was found recently in our farm but we couldn't recognize it.
Can anyone help us?
Sincerely,
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it looks a bit like a horse leech, I know that one, Haemopis sanguisuga, but it's ventral side is greenish in color
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Hello all,
With all the lockdown regulations, sales and trade may not be as it was before, goods and services are impacted; fish and fish products and services are not left out.
Would you kindly share your thoughts, opinions, experiences, and/or research on the various ways the Covid-19 pandemic has impacted Fisheries and Aquaculture, across its value chain?
Positively or adversely.
Thank you,
Precious Preye Ayawei
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I produced Glycerol monolaurate in lab scale, with a melting point of about 37 C. Now I want to use this product as animal feed additives. However the melting point of 37 makes the product difficult to be sold as solid nor as liquid. Now I need to convert this product to be liquid at room temperature, what do you suggest? Kindly put into consideration that the final product is feed additive.
One suggestion is to mix with a another material with very low melting point.
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I will do experiments in aquaponics for integrating tilapia and lettuce.
Can I use polyethylene tank and black color??or must be fiberglass and other color??
The problem I can not buy fiberglass.
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I following the best answer.
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Dear Community,
I am looking into the economic sustainability/feasibility of producing small-sized fish (tilapia and catfish) in pond farming aquaculture. I have made a list of parameters which may be needed (Growth rates, stocking density, survival rate, feeding rate, market price., etc.), though I am not sure whether I am on the right track.
I can't really find an existing model either. Any comment is welcome.
Best wishes,
Nuri Max Steinmann
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I following the best answer.
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hi dear scientists;
I had two ponds of fish, ( 1 for catfish , and other for tilapia ), the water was renewed at a same time for tilapia and catfish , after 2 days the catfish were dead, any sign of illness, the quality of the spring water is good.
this white layer appeared after the death of the catfish, then became a condence, it is a sign of presence of chlorine or mucus related to the defense of catfish ?
please who has an explanation?
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I following the best answer.
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The affected fish (O. niloticus) are three months old. The infected fish were taken for a public display after which this infection started. Water quality parameter for the tank where the fish were stocked are as follows:
D.O. - 6.3 mg/l at 86% sat
Temperature - 25°C
Ph - 8.25
The infection was observed to start from blinding one eye then spread to the other, then the fish stops feeding and dies. The fish died after two weeks from the time of the first observation of infection.
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I following the best answer.
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Hi, I am stuck in isolation in South Africa during this corona virus outbreak. Please could you share some reading material on tilapia culture, cage culture and best management practices in Aquaculture.
Thank you in advanced
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I following the best answer.
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Hello.here is Mr. Laid DARDABOU a PhD Algerian student. I'm gonna work for the same thematic as yours. Can we get a collaboration to expand the geographical area of the project? For my case I did chose the BSF and the moringa to be tested on broiler and aquaculture. Thanks in advance.
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Im watching this update
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The State of World Fisheries & Aquaculture 2020 from FAO is now available online (Please find attached). In this horrid time of global pandemic, please comments on the ongoing problems and future prospects of world fisheries - particularly I am interested to know, where we stand and where to go from here and how - considering how covid'19 is impacting/would impact the sector. Thanks. Dr. Mostafa Hossain, SAFS, UW, Seattle
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The State of World Fisheries & Aquaculture 2020 will continue to demonstrate the significant and growing role of fisheries and aquaculture in providing food, nutrition and employment.
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Are there particular impacts on aquaculture?
Also, how does the increase in zooplankton abundance correlate with fish population? Is it also somehow related to the effects of eutrophication?
Will highly appreciate your response on this matter. Thank you so much and have a great day!
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Hi Kathleen,
With a high population density of plankton-eating fish, ie with an unbalanced fish stock, large species of zooplankton, especially daphnia (Daphnia magna, D. pulicaria), disappear, we take them here as a component above 0.7 mm, which have the greatest predation pressure on autotrophic organisms. Instead, a small zooplankton (D. galeata, D. longispina, etc. and the genus Bosmina) may multiply, the predation pressure of which is limited by size. On the other hand, even with the presence of large daphnias and at the same time sufficient nutrients, especially phosphorus, those species of autotrophs that are unable to filter out can and often do occur. These are algae and cyanobacteria that form colonies, cenobia or fibers, but do not form vegetation turbidity. Therefore, even after the revitalization of stagnant waters, when the supply of nutrients from the basin is not solved - fish, wintering, siltation, cyanobacteria can develop into water flowers, so the top-down effect may not work. With increasing predation pressure of fish, the share of other groups, mostly small, zooplankton - copepoda, rotatoria - also increases. However, the main cause of eutrophication is the excessive supply of nutrients, especially phosphorus, inland waters. In general, however, it is a complex problem.
Today, 15.12., Temperature 3 ° C, I found the evident development of cyanobacteria in the highly eutrophic waters used as fishing grounds, while the water looks clean and transparent with good transparency.
Emil
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Impressive sharings! Regarding on that matter,somehow people use kind of tamarind whichever in paste or liquid to get rid offlavor on flesh fish,wondering is it live fish can be done that way after post-harvest before being distribute into market?
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Ervynna Christy Bandong and Simon C. Wilson In Bangladesh, the fish farmer moves the fish from pond to river cage one week before marketing and it shows that the off-flavor improvement and customer satisfaction.
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Which species is suitable for growing aquatic live food? In fact, a species that has been considered in recent years?
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Daphnia is an important food source in the freshwater aquaculture and ornamental fish industrycan be used in mariculture as replacement live feed for Artemia.
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I am thinking to investigate the roles of a specific gene during the embryonic development stages in a crab species. I was just wondering to ask about the possibility of gene knock-down or over-expression before hatching in aquatic animals.
Dose any have some experience regarding the drug/chemical/RNAi delivery into eggs in any aquatic animals?
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One problem you may face is that you do not have a genome or transcriptome. In that case you would need to sequence the part of the genome so that you can design the morpholino or CRISPR in order to perform knockdown (morpholino) or knockout (CRISPR). Unfortunately with CRISPR even if you do that you will not know what other sites in the genome the sgRNA has targetted - so maybe try both morpholino and CRISPR showing that both give the same phenotype.
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This species was isolated from freshwater pond here in Perlis, Malaysia. Unfortunately, I'm not certain about the name for this species. The size of this microalgae in range 2.5-3.5 micron. Is this Oocystis sp.?
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It can be the chlamydomonas sp.
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I want to know how to make probiotic in different concentration. I am planning to probiotic experiment with different concentration. I also want to know how to make the freeze dry probiotic powder with a definite concentration.
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Dear researcher,
Using McFarland standard we can workout for the turbidity matching for a particular number of cells per ml by performing TVC and use that concentration for the desired experimentation. The same can be use for freeze dry powder preparation by the method of choice.
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How to identify Nonpoint sources of water pollution in the Delta region?
Is there any hydrological model for identifying non-point sources of water pollution in agriculture and aquaculture based delta regions?
Eg: Western Godavari Delta.
Can I apply the SWAT model to Delta regions for identifying NonPoint sources of water pollution? (No streams but only canals and drains)
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I think a thorough visit is required to the area for the same along with recent activity track by google map. There may be several activities that can be a potential non-point source, so a direct investigation is recommend.
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While comparing several biogeochemical parameters measured in different stations of the same estuary, or two different aquaculture ponds within the same wetland, reviewers have asked for carrying out repeated measures ANOVA instead of students t-test. I would like to know more about the applicability of repeated measures ANOVA, like when can it be applied? why is it better than students t-test (independent samples)? and most essentially when can we not consider this test?
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Now that was such a lucid explanation and so easy to understand. You cleared many of my doubts, Sir. I really appreciate it.
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Among various factors, the temperature is one of the most crucial factor for enzyme activity. For most of the enzyme assay, researcher use 37oC or normal room temperature as incubation temperature. If we consider the poikilothermic animals like fish, it's natural enzyme activity depends on habitat temperature and each fish (tropical, temperate, polar or cold water species) has their optimum temperature at which it grows best and we know growth is nothing but a consequence of optimum (good) metabolism.
So, is it right to use the mentioned assay temperature for enzyme activity of fish irrespective of its natural habitat?
Or,
Do the researchers need to modify the assay temperature according to optimum natural habitat temperature of fish?
Please provide your suggestions.
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We may not adopt a single temperature for fish enzymes such as 37ºC in case of human samples. It should be specific the species as fish is not a single species. Again, we need to find optimum temp for each of the enzymes as well. For convenience, we can select a constant temperature for all enzyme assays, which can be selected based on the optimum temperature for growth of that species. In the following publication, you will find an optimum range of temperature for digestive enzymes, however its quite a wide one (45-65ºC) https://scialert.net/fulltext/?doi=jfas.2017.264.272#:~:text=The%20optimum%20temperatures%20for%20both,water%20temperature%20of%20the%20swamp.
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I am doing an in vitro research on the Nitrogen cycle in aquaculture pond water. For my experimental facilitation, I want to remove ammonia nitrogen from water without hampering the biomass of microbiota and other nitrogenous compounds. Can anyone please help me with possible solutions?
Thank you in advance.
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In the alternative, you may use Deep-Water-Culture technique of aquaponics to grow some useful vegetables which biologically utilize ammonia-nitrogen in form of nutrients. You may quantify the nutrients by running the proximate analysis of the vegetables after harvest. Read further. Thanks. @
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Hi everyone,
Zoea 2 syndrome is currently the greatest loss of shrimp larvae across worldwide. By searching various articles and the discussions had with experts in aquaculture, the reasons behind Zoea 2 syndrome was not clear and the experts say that it may be due to the algal quality, nauplii quality and water quality of which the exact factor was not know, can anyone elaborate on the exact causative agent of zoea 2 syndrome in vannamei and the best control measures to prevent it apart form best bio-security practices would be highly appreciated and if any articles pertaining to zoea 2 syndrome in vannamei would be highly appreciated.
Thanks & Regards
Dr Vishnu Kiran Manam
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Thank you
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I'm PhD graduated in fisheries. Have some experiences in crustaceans propagation, trout egg hatchery, larval rearing in RAS system, aquaculture in the floating HDPE cages in Caspian Sea and etc.
You can find my curriculum vitae in the attachment. All my fisheries research and activities are mentioned there, in brief.
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I am looking for a funded PhD position in Aquaculture/Fisheries. Preferred locations are Germany and Canada. I have an MSc. Fisheries Science from Universiti Putra Malaysia and a B. Fisheries and Aquaculture from University of Agriculture Makurdi Nigeria.
My research interests are in the areas of RAS, Aquaponics, Biofloc and wastewater aquaculture.
Kindly find my CV attached for your reference.
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If I have 10 kg of fish and produced 7.5 g ammonia per day from waste.
And according to the data each in literature each 0.57g of ammonia need 1 square meter of biofilter material such as bioballs to convert per day.
That mean this 7.5g ammonia need 13.3m2 of specific surface area of bioballs inside the biofilter tank.
the volume needed from convert this ammonia(7.5g) around 0.0443 m3
0.57g..........need............... 1m2
7.5g ..............need............... ??
Then we need 13.3m2 of specific surface area of bioballs to convert 7.5 g of NH3
If we used bio balls as biofilter materials which is have 600m2/m3 specific surface area and the volume needed from convert this ammonia(7.5g) around 0.0443 m3
The specific surface area 600m2/m3
And can convert as 600m2/1000L
The for 13.2m2
600m2................ 1000L
13.3m2 ...................???
According to the calculation we need 22L from bioballs to convert 7.5 g.
The question is how we can put 22L of bioballs.
I mean put bioballs in container size 22L and fill by bioballs materials or what I must to do.
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Abdel Razzaq M Al Tawaha You can start with the volumetric data and take a wide-mouth measuring beaker to roughly estimate this volume. Again, roughly. So, for a 50% fill volume, take 44 liter reactor. From beaker, fill the media carriers and top it to 22 liters (you can do it in batches for less error). As a rule of thumb, many people start at fill fraction of 0.40-0.55. Now coming to the technicality, the data that you mentioned, i.e., 0.57 g ammonia, we need 1m2 surface area is not true based on volume. Actually, you need to also check the ammonia loading rate per m3. For example, a research done by Harwanto et al, 2011 observed that the areal ammonia removal rates for Kaldness filter media (500 m2/m3) under the ammonia loading rates of 5, 25, and 50 g m-3 day-1 were 64.1, 285.1, and 576.2 mg m-2 day-1, respectively. Hence, you must consider the loading per unit volume of wastewater too while designing. But also, do not forget the rule of thumb. You can also refer my article on MBBR. Best of luck!
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Isn't it amazing that the one region on the world where water is far more abundant than land and livelihoods are highly dependent on the ocean and its resources, that aquaculture has attracted the least research and funding?
With the current issues affecting the globe, it is high time the Caribbean region be given the necessary funding for aquaculture research and development.
This would create employment opportunities for thousands of people and reduce the region's dependency on foreign imports.
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Estimado, creo que si en el caribe aun no se desarrolla la acuicultura considérense unos afortunados. Si bien es cierto la acuicultura se considera como una alternativa mundial sostenible para obtener proteína animal sin depredar el mar, también hay que considerar que realizar la misma cerca o enclavadas en zonas ecológicamente sensibles y vulnerables a los contaminantes como arrecifes o manglares, hacen de esta actividad nada sostenible y poco amigable con el medio ambiente, como lo sucede actualmente en sudamericana. Para citar un ejemplo, lo que sucede con la actividad acuícola langostinera que se ha desarrollado en el pacifico ecuatoriano y peruano, la cual para asentarse ha tenido que talar cantidades muy considerables de bosque de manglar, atentando ecologicamente con el medio dado que los manglares funcionan como zonas de reproducción y precria de muchas especies de peces, invertebrados y aves costeras, y si pensamos que el atentado acaba allí, pues nos equivocamos, entre mas grande es la granja acuícola, mas grande es la contaminación con los efluentes que ellas vierten al ecosistema, si bien es cierto existen normas para regular la emisión de los mismos, pues el control y fiscalización de las mismas es nulo.
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in some aquaculture facilities, you can find labs (microbiological and wet labs) for research objectives. in many cases, you have to do pathogen challenges for better consequences and analysis of your results. so, my exact question is that is it ok to done pathogen challenges in animals, especially fish, farms. If it is not ok, is there any references that cite this content clearly and with convincing reasons?
cheers,
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Hi,
If you want to do pathogen challenge test on fish in farm conditions then the Answer is No. There are many reasons-
1. After challenge test using any pathogen you need to disinfect the whole system (fish + culture water) before discarding. So it will be difficult to treat the whole farm (environmental concerns)
2. I don't know what will be the stocking density of fish or the volume of culture water of your farm, but the amount of LD50 or LC50 required will be expensive, respectively (economic concern)
3. To administer LD50 to huge number of fish is a laborious job (Manpower)
4. Cross contamination with other microbes present in the culture water (Authenticity)
There are many reasons to support that it will be unethical to do challenge test in farm conditions. Better use a controlled system which will be convenient.
Thank you.
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Any burning topics of aquaculture for review article?
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Follow
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What could be the main design challenges in aquaculture engineering? in what kind of aquaculture sector?
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I think...it all about the countries....which really pay attention on the design or not...I mean limitations generate the ideas some time...RAS is not that popular in India but it popular in other countries.... similarly bund breeding is quite famous in India but less in other countries...if we will think about cage western world is leading but still in so many countries...it's not up to the mark...so i think all the aquaculture enngg design need to work out efficiently....
Further I would like to suggest about the vertical farming model...which may be very useful in the coming future..
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It seems world agriculture and food will be dramatically affected by Covid-19. Rather than exports, probably every country will cling to its own resources. I am very curious about what will happen to fisheries and aquaculture (fish meal and fish oil prices).
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Definitely the price of foods would be astronomically high and looking at fisheries and aquaculture food products it would be seriously affected. Even if the supply is available the money to procure the items might not be available and this can discourage the fish farmer who has spent so much to raising the fish to appreciable size without seeing market.
In Nigeria, fish farmers would be forced to sell on credit and the demand might be low as many restaurant business owner would go bankruptcy due to the prolong lockdown which has prevent the business from operating over a long period...
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Dear Everyone,
Could you please suggest me any Organisation/ company/ government that have fund/research grant for international research in aquaculture/ marine biology or related fields? (I can use the fund to do research in any lab/any country).
Thank your so much for your time. I really appreciate you time and answer.
Thao
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WWF
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We are conducting a respirometry trial with trout and want to know, if we can estimate the maximum metabolic rate without directly measuring it with a chasing protocol. We can´t trigger a MMR response because we want to measure the SDA over the full duration and it would add oxygen comsumption, not related to SDA.
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You can estimate MMR as 21*SMR/Pcrit (kPa).
Seibel, B. A. and C. Deutsch. 2020. Oxygen supply capacity in animals evolves to meet maximum demand at the current oxygen partial pressure regardless of size or temperature. J. Exp. Biol. 10.1242/jeb.210492
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I research fresh water algae (chlorella vulgareis).
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My Chlorella vulgaris culture crashed after it was invaded by protists which I couldn't identify. I think they were there in the starter culture. They exhibited amoeboid movement, as shown here under the microscope.
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I am currently looking data for infrastructure investment for marine transport, government expenditure or investment on fisheries or aquaculture, government expenditure on gas and oil exploration, government expenditure of harbour development ?
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Contact these SA departments
Department of Public Enterprises;
Department of Trade and Industry ;
Department of Agriculture Forestry and Fisheries
Department of Transport
Good luck
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Could anyone suggest if any published papers related to the utilization of single cell proteins that mainly derived from fungal species, in particular Aspergillus in aquaculture practice?
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Here's a paper about Aspergillus used on soybean meal fermentation for animal feed. It is not directly applicable to aquaculture feed though but could be a reference
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Probiotics are working of life (living organisms, esp. bacteria) for life, by life and in life's suitable niche. They favour friends and ward off enemies, boosts immunity, maintain balance of the microbiome in gut. We can find its wide applications in the field of aquaculture.
You all please present probiotics' application in diverse fields of environmental management in tackling pollutants and toxicants. Discuss in detail and share relevant resources about how they act to fulfill the goal
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Probiotics are very useful in all fields of research. it is proven that some species of lactobacillus bacteria have the potential to absorb heavy metals from the water and make it useful. in addition to cleansing and purification of water, there are many practical applications of these probiotics in aquaculture and phytoremediation. probiotics are also involved in sanitizing the hospital surfaces and disinfecting them.
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innovation in fishing and aquaculture for direct human consumption, direct problems, suggestions for hypotheses?
In my city, there is a high rate of anemia in children, which is very worrying. The issue of creating food alternatives in high concentrations of iron is not enough, the consumer must feel the product is pleasant.
suggestions
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In my opinion, the cause of anemia needs to be investigated first. If children have anemia in general, this may not be caused by nutrition. First of all, intestinal parasites should be investigated (threadworm, tapeworms, taeniae, etc.). If this is not an issue, it should be investigated what prevents iron absorption. In addition to seafood, green vegetables and dried legumes are also important sources of iron. But first, the source of the problem should be determined.
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Hi All,
at the Museum of Nature South Tyrol, in Bolzano / Bozen, Italy, we're keeping in aquarium for more than 10,5 years 3 American horseshoe crabs Limulus polyphemus.
What is the maximum longevity of American horseshoe crab in aquarium?
Thank you!
Sincerely,
Massimo
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Dear Daniel Taylor,
many thanks for your reply! I didn't know this paper. It is for me very interesting.
Sincerely,
Massimo
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as you know, micro-algae can change pH and make problems in aquaculture. i want to know how can i maintain pH in range of 6-8 or what materials can do it.
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If your system's pH rises, it means that microalgae culture is performing photosynthesis (which requires CO2 as a basic supply); in this case, a 0.5% CO2 supplementation would be convenient.
On the other hand, if your system pH is low (approximately 6), the CaCO3 addition is recommended.
Of course, these reagents can be expensive and unviable depending on the system size - but in my best opinion, they are best recommended for no damage to microalgae culture.
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Is there any way to calculate the volume of freshwater usage in brackish aquaculture (i.e. shrimp farming) ? If not, is there any research with empirical data about it?
I concern about freshwater demand because in coastal area, farmers usually extract freshwater from groundwater to mix with saline water. The amount can be significant to some extent.
Thank you.
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hi, you need to know the optimal concentration for shrimp farming, and the concentration of salty water, preferably use demineralized water, fresh water contains an amount of salt. after you make a rule of 3 to know the volume needed and you use a device to confirm the concentration. good luck
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I want to do the following
1. Prepare a stock solution for Gramoxone pesticide (it is labelled 276g paraquat dichloride/L).
2. How do I determine the concentrations to be used in a fish toxicity experiment?
Can anyone help?
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According to the MSDS for Gramoxone, the 96-h LC50 for paraquat-dichloride for rainbow trout is 55 mg/L, so multiplied by 1000/276 gives you the approximate LC50 for the formulated product. For bluegill sunfish the LC50 for paraquat-dichloride is 13 mg/L. So, if it is necessary to repeat this vertebrate testing, you would want to space your concentration around the LC50. For aspects of test design you can use the OECD Test guideline 203 acute fish.
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I am looking for an article in which a plant or combination of plants with a low dose (0.001 of food) is used to improve both growth and the immune performance of rainbow trout. The lowest dose of the crude plant as a supplement in the articles I dealt with was 0.01, But I'm looking for plants with a lower dose (about 0.001 or lower).
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