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Aquaculture Management - Science topic
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Questions related to Aquaculture Management
Give me technical guide on decreasing salinity level in Larval rearing tank. I want to drop down salinity level from 25 PPT to 0 ppt in 7 days duration in L.Vannamei Laraval's PL stage in larval rearing tank by adding Fresh water source. While decreasing salinity level PL s get stressed. How to avoid/ reduce stress in L.Vannamei PLs during that process. To balance Minerals loss, I add calcium carbonate & Magnesium cloride into the water to make PLs feel less shock from the sudden salinity level change. Is there any formula for how much calcium & Magnesium or any other minerals need to be added into the water for every salinity PPT downing to make PLs strong?
What Causes the green color change? Because Diatoms are produce brown color tint in the tank. Does It lead high mortality rate in shrimp post larvae in larval rearing tank
In shrimp hatchery, usually water exchange takes place after animal reached postlarvae stage. So how to retain the probiotic microbiome again quickly in order to avoid pathogenic bacteria's bloom???
Is it only Balancing input C:N ratio, Promoting suspended-growth nitrification or any other management practices.
An alternative livelihood can be generated from marine algae.
Stock assessment and management of fishable marine resources are ultimately based on fishing mortality. If the populations of fishable marine resources appear overexploited, the solution generally recommended to policy makers is to reduce fishing effort. Wisely, many policy makers take into account the mortality of the fishermen through measures such as "loss of income" etc .. Unfortunately policymakers, pressed by the fishermen’s lobby, often excessively favour the fishermen in fear of losing support.
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?
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.
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?
Dear acquaintances: Anybody with an experience of farming with Mugil cephalus (mullet) fish; its growth performance, diet composition, appropriate culture systems, water quality parameters suitable range, breeding, diseases, management etc? I Will highly appreciate it if you attach reference documents too.
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.
what is the difference between monitoring and maintenance of water quality such as pH,EC, Salinity and alkalinity in aquaculture and aquaponics.
The fish are kept under a re-circulatory system, fed on 0.25 mm Skretting at an interval of 1 hour everyday, and the excess feed (if any) is siphoned out regularly. Average water temperature is 28 degrees centigrade .
Generally, to maintain ecological status, five factors are considered for a river ecosystem:
1. flowing water that is mostly unidirectional
2. a state of continuous physical change
3. many different (and changing) microhabitats
4. variability in the flow rates of water
5. plants and animals that have adapted to live within water flow conditions.
During water distribution of trans border water resources, only water is considered irrespective of water ecology. If we want to consider river ecology, especially for maintaining fish population, and want to estimate minimum water flow, what procedure may be adopted to identify minimum required flow?
There is a directive in Ghana by the Ministry of Fisheries and Aquaculture Department to ban all imports on ornamental fishes and Tilapia species including gametes-eggs and milts from now to the close of the year as an immediate response to halt the spread of the virus which is said to be prevalent in Africa, South America and Asia, especially in farmed Tilapia. This is a blow against the global Tilapia industry.
Kindly share your views on the new virus, ways of preventing it and other references. Thanks in advance. Best regards
I am working on integrated fish farming system. The size of pond is about 0.1 hectare. I need to study the growth of fish at different interval. The size of fish stocked are not uniform. Please suggest me how sampling can be done. should I keep some fishes in cages. what statistical design will be implement
Estuary, definition, extension
Referring to traditional aquaculture in Asia, carrying capacity is the primary basis of natural production in a closed water body, like a pond. Aside from this, fertilization and application of feeds enhance fish production. Pollution caused by pond effluents also needs to be considered for ensuring sustainable aquaculture.
We want to calculate the contribution of nutrients to sediment in salmon farming.
In order to pursue closed mesocosm study on zooplankton and phytoplankton, I'd like to know the amount of innoculum to be inoculated for mesocosm tanks with capacity of 100 liters. Please also advice me with insights about closed mesocosm.
An article stated this:
Addition of a little amount of NaCl in the ambient medium especially in the case of tilapias, might be of advantage, but the system has to be sufficiently modified since conditioning is often done in open waters.
Salt is removed with water in open waters. Does anyone know how the system can be modified? or has other methods?
Some contradictions I'm facing:
Sodium bicarbonate is highly alkaline, does that mean it increases water pH? Fish excretes ammonia during transportation, it gets toxic when pH is high, why would people still add sodium bicarbonate into water?
Sodium bicarbonate produces carbon dioxide when react with water, carbon dioxide produces carbonic acid when react with water, doesn't that decrease the water pH? To what level will the pH decrease? It harms fish's respiration if the water is too acidic.
Hope someone can help me with this!
Dear researchers would like to know the possibility of arabian seabream Acanthopagrus arabicus (latus) and sobaity Sparidentex hasta cultivated in concrete tanks and what better stocking densities and water flow rate.
I am working on a data whose sample size is very small (about 10). I know bootstrapping can help generate accurate standard errors of the mean etc. I however wanted to save the bootstrapped sample that SPSS generates which it uses for the determination of the confidence intervals. The idea was to play around with this generated data itself. There seem to be no way around this in SPSS, or is there?
I need the steps for each measurement, the equations, the interpretations and the specific measurement and weighting techniques. Please ask if you need additional information.
We have been monitoring a temperate lake during the winter and observing Daphnia under the ice, when normally they would not be found in the water column. Some of which still have asexual eggs. The system is hyper-eutrophic which is leading us to think perhaps food conditions still permit growth even though temperature is cold.
Has anyone else observed Daphnia in winter or under the ice in lakes? Thanks.
I need some information about present situation of Gammarus species in aquaculture industry and their economy importance.
Though i am working on fish from past few years, presently i have shiftd my focus towards aquatic plants. In this connection, I want to conduct a growth studies as well as effect of differnet manure on various aquatic spp.
with reference to extreme weather events
To be applied to aquaculture. The largest I've found in the literature is 10L for this species.
I would like to connect with some researcher with a view to obtaining information.
Organic shrimp farming is not fully stable in Vietnam. I am very much interested to see how organic aquaculture has developed in the world.
For the recommended water quality parameters (DO, salinity, alkalinity, and others) for shrimp (L. vannamei or P. monodon) is used as the fixed parameters during a crop.
Based on experience/research/papers. Does anyone know about the specific water quality parameters (DO, salinity, alkalinity, and others) for the specific stage of shrimp culture? For example, how about the optimal water quality parameters for the first 30 days of culture, for the period between day 30-60 of culture crop and continue until harvest?
Thank you very much for helping.
I want to compare my result with standard water quality parameter for reference point of view i need the information.You can suggest if you did research practically. Thanking you Regard Brijesh
I had 3 data group. environmental data (Temperature, Oxygen, pH, EC and Turbidity), zooplankton community and growth rate of a fish. All data belonged to a one pool. Now I tried to find a best model to describe the relationship between number of zoopnaktons, environmental data and growth rate of the fish. what is best statistical method? Is GLM applicable?
Thanks for your help
I do have papers from the USA and Canada, however I am looking for other parts of the world where shellfish aquaculture is present and thriving such as China, Spain etc..
I am undertaking my thesis research onshrimp culture using the new biofloc technology. How do I set up a new biofloc system? Anyonewho can assist me with literature and videos on how to set up a biofloc system?
Most of the papers I read said that they've done 3 months feeding period to test the experimental feed to the fish fingerlings. What is the significance for this 3 months period?
Mainly from EU regulations and directives, or from FAO guidelines.
Dear Friends, I am trying ECOSYSTEM based modelling of Zuari Estuary (Goa, Southwest coast of India) with about 24 ecological groups. The basic inputs were provided and the model was mass balanced (adjusting the biomass of four groups) with Eco trophic efficiencies were kept under one. However, the respiration values are showing negative values and it is given as an error in result display. How should i adjust the input data (Diet matrix or Biomass which has to be adjusted) for making the respiration values to positive and within one.
We're doing a research on the effects of WSSV on Penaeus monodon species cultured in the Philippines.
Some published literature gives examples of tray-type cage that uses a small mesh size as the floor and a larger mesh size to make up the walls and roof. I have not found examples of this design being used at large scales.
Another option is to use abalone-type cages.
Does anyone have further ideas for suspending specifically sea-cucumbers?
I am looking for out-door aquaculture technique which takes advantage of gravity so as to conserve energy inputs. Are there such techniques available, I am particularly interested in algae. Any comments in this aspect is highly appreciative.
In case of commercial fish farming poly and mono-culture (carp, tilapia, pangus, catfish, or exotic carp). How does species selection (eg. size, ratio, species, seasons) and crop rotation affect the productivity and growth of fish in commercial farming?
Please don,t hesitate to explain in detailed. Thanks in advance.
the idea is to evaluate the limit for shrimp aquaculture growth in coastal systems (lagoons, estuaries), based in their size, nutrients loading, type of aquaculture system (extensive, intensive, hyperintensive) or any other indicator
Transportation of brooders or seeds (egg,fry, larvae) is very critical in aquaculture process. Due to poor managing practices mass mortality can be happened during transportation. What are the parameters to be monitored or measured during (before or after) transportation of fish?
with reference to Indian Major Carp culture.
using only ground water, with reference to growth.
Why has seed production of portunid crabs (Scylla serrata& Portunus pelagicus) not reached commercial level on par with penaeid shrimps?
With reference to inland aquaculture.
Please provide information on research status on multitrophic aquaculture system. m.
I try to identify this species but in sequentiation analysis indicate that is M. sallei but morphological is similar to M. leucophaeata.
In GIS which model is most suitable for site selection of aquaculture ponds?
I am thinking of including it as an ingredient in an experimental aquarium diet.
I try to control algal blooms in fish farms using rice straw. Which of the different released substances from rice straw, and how can I analyze it?
I have been trying to find out what company/research center that may be able to provide nauplii of white shrimp (L. vannamei) in the US for my research. I have contacted Hawaii and Florida with no luck so far. If you have any contacts that I can connect to, it would be much appreciated
Thank you very much in advance.
We want to know if there are different effects in feed consumption of Leucaena leaf meal inoculated with B. circulans extracted from the soil and B. circulans extracted from the gut of Labeo rohita (rohu).
What are peoples perception about Total Quality Management in relation to Aquaculture production?
The motive is to develop spatial planning tools to support the ecosystem approach (considering bio-physical and socio-economic factors, suitability of cultured species, scale of operations and farming technologies employed) to aquaculture and fisheries development. But, as a beginner, I would like to know what are the spatial planning tools widely used in these kind of research. Any kind of help is greatly appreciated.
With reference to semi-intensive shrimp farming. Thank you.
I want to quantify stress levels in noble crayfish (Astacus astacus), kept in different light conditions. Most studies on crustacean stress seem to focus on the effect of acute stressors. Can anyone suggest physiological parameters in hemolymph or tissue that indicate chronic stress?
For artificial shelters (reefs) which materials (wood, concrete, plastic tube, pvc) are more friendly or familiar with environment? specially for crayfish.
Could you please tell me in maximum range for intensive culture how many fish like Cyprinus carpio (common carp) or Oreochromis sp. (tilapia) can be used in a square meter?
I've encountered several journal articles and studies that show aquaculture water quality is not usually studied on its own and the studies show results are tied to specimen immune response.
If so, does it result in fungal contamination of the system?
We started feeding Liquifry and the other empty tanks started to have fungal growth. Was wondering if anyone had any experience with this. Thanks!
If you have any experience (or know someone who has it) in the production/reproduction of Atractosteus tropicus, and want to share it, I will thank you a lot.
There is a little literature about it, but I want to hear field experience about the environmental, nutritional and management requirements of this fish.
Barnabas (1980) proposed a system for collecting zooplankton in lagoons using autonomous and stationary devices, for which I tried to estimate the cost of installation, but would there be another way that is more efficient?
The complete reference of Barnabé is:Barnabé, G. (1980). Système de collecte du zooplancton à l'aide de dispositifs autonomes et stationnaires, in: Billard, R. et al. (1980). La pisciculture en Etang. pp. 215-220
Some culturists collect feral fingerling marine fishes to be cultured. The isopods have been transferred from feral fish to the farmed fish or to fishes in open lakes.
I need to know how to control this mistake in transport in new situations.
My name is Maria Rousou, I am a biologist working at MER Lab Ltd in Cyprus (www.merresearch.com)
I would like to ask for your guidance and advices regarding the open-sea aquaculture annual emissions estimation in coastal water.
According to the Regulation (EC) No 166/2006 of the European Parliament and of the Council concerning the establishment of a European Pollutant Release and Transfer Register and amending Council Directives 91/689/EEC and 96/61/EC” (the ‘E-PRTR Regulation’), fish farms with production capacity of more than 1000 tonnes of fish or shellfish per year need to submit to the National authorities their annual TN, TP and TOC releases in sea water.
The E-PRTR guidelines and references cited within, state that the annual TP and TN emissions can be estimated by using the mathematical formula
L = 0,01 x (ICi - PCf)
L : phosphorus (P) or nitrogen (N) discharge to water body (tonnes/year)
I : feed used (tonnes/year)
Ci : P or N content in feed (%)
P : production (tonnes/year)
Cf : P or N content in produced organisms (%)
For the TOC determination (as Total C or COD/3), the guidelines state to carry out water analysis following ISO 1484:1997.
However, no further information is provided on how frequently the samplings should be and how to use these snap-shot data to determine the TOC annual emissions in sea water. Using the mathematical equation stated above without validation could lead to over or underestimation of emissions.
Do you have any guidelines/advises on possible ways to determine fish-farm TOC annual emissions releases in seawater?
Please keep in mind that the regulation requests that the estimations must be done at lowest costs.
I am trying to evaluate the amount of MT which could be used as a minimal single dose/amount required per day to each fish to have an effect on sex reversal. What is a minimal amount of MT per fish to effect the sex reversal?
In the mixture of feed and hormones, how does this hormone attach to the feed after alcoholic evaporation? Is there any bonding?
Also, I would like to know the mechanisms of effects once the hormones enter the blood stream, where is it acting?
For many reasons, for walleye larvae production, we need to increase light scattering effect in the tank water column. This is actually possible by adding suspended solids like clay, resulting in an increase in turbidity and therefore in light diffusion in the water column. However, this addition of clay causes some filtration problems in a recirculating system and it's why I'm looking for an alternative idea : dissolved matter like dyes? Mirrors setup? A kind of screen over the tank ? Special light diffuser?
Is there any other methods except Bomb Calorimeter for finding the amount of energy in diet?
I've put a drop of water from the bed of my walleye larvae tank under the microscope at 400X and i've seen these rod-like bacterias. By its shaking mouvements, do you think this is Flexibacter columnaris (see the video : http://youtu.be/SYH4wZCw8wM) ? This is not appear to be "flexible", so I guess it's not. I've no sign of disease on fish for the moment. The bacterias seems to feed on food residue. (Freshwater: Temperature = 18°C, [O2] = 8mg/L.)
Sustainability is a word constantly being used in describing various aquaculture systems, defining goals for aquaculture etc, but what does this really mean? Does it demand no environmental impact, or no net energy usage, or no fish-based feed ingredients, or what?
It seems to be the favorite phrase by politicians and legislators, and we scientists use it constantly as well, but what do we really mean when we use it?
Offlavor is a big issue in fish marketing and caused by many reasons such as geosmin from filamentous bluegreen algae, benthos, pollution etc. Consumers don't prefer such fish and as a result, producers lose market. There should be a way to solve this problem. Can anyone make any suggestions?
I would like to verify if adjusting the pH of the water in an emptied Salmon RAS will successfully kill saprolegnia zoospores. Our plan is to adjust the pH to 13, does anyone have any information whether this is sufficient or if there are more suitable alternatives. Thank you.