Questions related to Fisheries Sustainability
I started a project to study local natural resource management systems. One of the aims is to measure the readiness of indigenous peoples' institutions. I need some input and suggestions on suitable variables and methods.
Can anyone give an idea - how is the hydraulic circuit playing a role in the development of aquaculture / fisheries? How can the knowledge on hydraulic circuits help? Why is it important?
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'm very interested to obtain information about current state and further development of freshwater aquaculture (trends, topics, main problems, etc.). I will be very thankful for any ideas concerning this topic.
Would greatly appreciate if anyone can point me in the direction of a harvest strategy for a recreational fishery - working or not.
Thanks in advance and happy to discuss
catch means discard+landing, in this case can we use data of landing to estimate MSY
Aquaculture is accounting for more production volume globally, especially as in China. There is however an impression that aquaculture causes much more environmental pollution.
I have tried to address how management plans for fisheries can be local in relevance to the context that CFP (Common Fisheries Policy) guides. Is there any proof that such plans can be local for fishing management practices?
Fish farms to produce nearly two thirds of global food fish supply by 2030
Washington/Rome – A new joint report by World Bank, FAO, and the International Food Policy Research Institute, looks at prospects for fisheries and aquaculture — or fish farming — that will provide close to two thirds of global food fish consumption by 2030, as catches from wild capture fisheries level off and demand from an emerging global middle class, especially in China, substantially increases.
These are among the key findings of "Fish to 2030: Prospects for Fisheries and Aquaculture." The report highlights the extent of global trade in seafood which tends to flow heavily from developing to developed countries.
According to FAO, at present 38 percent of all fish produced in the world is exported and in value terms, over two thirds of fishery exports by developing countries are directed to developed countries. The "Fish to 2030" report finds that a major and growing market for fish is coming from China which is projected to account for 38 percent of global consumption of food fish by 2030. China and many other nations are increasing their investments in aquaculture to help meet this growing demand.
Asia — including South Asia, South-East Asia, China and Japan — is projected to make up 70 percent of global fish consumption by 2030. Sub-Saharan Africa, on the other hand, is expected to see a per capita fish consumption decline of 1 percent per year from 2010 to 2030 but, due to rapid population growth of 2.3 percent in the same period, the region's total fish consumption will grow by 30 percent overall.
The report predicts that 62 percent of food fish will come from aquaculture by 2030 with the fastest supply growth likely to come from tilapia, carp, and catfish. Global tilapia production is expected to almost double from 4.3 million tons to 7.3 million tons a year between 2010 and 2030. "The fast-moving nature of aquaculture is what made this a particularly challenging sector to model - and at the same time, embodies the most exciting aspect of it in terms of future prospects for transformation and technological change," said one of the report's authors Siwa Msangi of IFPRI. "Comparing this study to a similar study we did in 2003, we can see that growth in aquaculture production has been stronger than what we thought."
The World Bank's Director of Agriculture and Environmental Services, Juergen Voegele, said the report provides valuable information for developing countries interested in growing their economies through sustainable fish production, though he warns that carefully thought out policies are needed to ensure the resource is sustainably managed. "Supplying fish sustainably — producing it without depleting productive natural resources and without damaging the precious aquatic environment — is a huge challenge," he said. "We continue to see excessive and irresponsible harvesting in capture fisheries and in aquaculture, disease outbreaks among other things, have heavily impacted production. If countries can get their resource management right, they will be well placed to benefit from the changing trade environment."
Fisheries and aquaculture are a vital source of jobs, nutritious food and economic opportunities, especially for small-scale fishing communities. Yet threats from large-scale disease outbreaks in aquaculture and climate change-related impacts could dramatically alter this.
Árni M. Mathiesen, Assistant Director-General of FAO's Fisheries and Aquaculture Department, emphasized that unlocking the potential of aquaculture could have long-lasting and positive benefits. "With the world's population predicted to increase to 9 billion people by 2050 - particularly in areas that have high rates of food insecurity — aquaculture, if responsibly developed and practiced, can make a significant contribution to global food security and economic growth," he said.
To download the report, go to www.fao.org/docrep/019/i3640e/i3640e.pdf.
I am seeking citable examples of fisheries MISmanagement due to stock assessments using poor quality indices of stock size. Particularly if the indices were fisheries independent and misrepresented patterns in stock abundance because standardization (or lack of) did not effectively account for variation in sampling efficiency. Examples could include incorrect standardization or a lack of standardization.
Any leads would be greatly appreciated!
I am conducting a study in which I identified the species per catch of two different fishing techniques and now I want to test if there is any significance in the composition of the species between those two techniques and maybe at a later stage incorporate the season. While searching in other studies I identified Bray-Curtis dissimilarity as a common technique but since I am not feeling very comfortable with my statistical skills I would like to know if this is the best way or there are more techniques.
Management of a renewable natural resource such as stock of fish is key to sustainability of the resource. While simulating the population of a renewable resource such as fish stock, we expect the system (Stock & harvest) to converge to a steady state equilibrium (i.e. initial stock is in the basin of attraction). However, this is often not the case since there is a likelihood of experiencing a complex dynamic behavior including deterministic chaos where steady state equilibrium is never reached. Consequently, managing a fishery becomes a nightmare. What are some of the key determinants of such complex dynamic behaviors & how should a resource economist deal with such problems as far as managing a renewable natural resource is concerned?
I'm in literature search with the increase in the protein content in fish (mackerel and sardines), over the last decade.
In recent years, the results of our analyzes showed a clear evolution of the protein content:
We passed from 11.4g / 100g (2008) to 18g / 100g (2014) => this is much more a variation due to a change of diet, or a laying period.
Because of an evolution of the species?
What assumptions can we emit?
What are the causes of variability in the protein content in both species?
thanks for your help
How have dynamics in fisheries governance affected food and nutrition security for riparian communities. What is the best model or theory or approach?
I'm currently drafting, "A review of the feasibility of restoring and maintaining stocks above BMSY levels within mixed-species fisheries" for
an NGO. In my opinion it's ecologically impossible either to manage or maintain multiple fish stocks simultaneously at BMSY because of multi-species interactions?
Also the majority of organisations that manage fish stocks do so on a stock/species by stock/species basis ? Multi-species advice is indeed issued, e.g. ICES, but the real management actions (e.g. quota-setting) is still really based on single species assessments. Someone might have to decide whether to kill more cod to get more herring ? Is that true or are there any organisations around the world that issue holistic multi-species advice on their fisheries backed up by management decisions?
The breeding technology is successful but the survival of hatchling to fry is very low in the case of Pangasius hypophthalmus. It needs to solve by proper research. The science behind the low survival is clear but the technique to increase the survival is lacking.
We recently completed an assessment of an overfished U.S. stock under a rebuilding plan. The rebuilding plan is intended to achieve the spawning potential at 30% of the unfished potential (i.e. SPR30%) in 2017. Our (2015) analysis suggested that the stock could not rebuild to that target, even at fishing mortality = 0. Management council staff argued that under this condition, U.S. National Standard Guidelines (NS1) allow an annual catch limit (ACL) computed using an equilibrium projection at 75% of FSPR30 (the proxy for F at optimal yield). This would delay the rebuilding of the stock for about 60 years, and permit fishing mortality levels that have recently resulted in ongoing depletion. Does anyone else have examples like this? How do other regulatory councils manage under this scenario?
What are the best tool to measure and analyse the environmental impacts based on the indicators?
I need specific environmental indicators and impact categories for the commercial trawling fisheries.
To evaluate the detailed environmental impact and impact categories of the fisheries, what the type of data and information required.
Which deep-sea resources are currently exploited in the Caribbean Sea? Which nations are the main actors and what is the environmental impact?
b value in LWR may vary due to combination of one or more factors such as area / season effect, habitat, age, gonadal maturity, fish condition and fish health while K value in Condition Factor are depending on habitat, food source availability, age and sex of different species. They are somehow inter-related but how can we differentiate them?
This will be essential for adequate fisheries management of most especially developing countries
what is the best management of Mediterranean fisheries within a framework of sustainable development?
Would it be: technical, limited data, scientific, cultural, philosophical, logistical, organizational, structural, personality driven, educational, or ??? What does the community think?
I have begun to study this topic lately and I'm looking for relevant works in the field. I'm especially interested in information related to socioeconomic issues such as drivers, effects, impacts, cultural approaches and so on. I really appreciate all the help you can give me pointing out literature and case studies. Thanks so much. And all the best for all.
I am interested in useful management tools for small-scale fisheries.
I am currently conducting research on a flying fish roe fishery in Taiwan. This is a very unique fishery as it targets the egg instead of the adult fish (i.e., essentially, no fishery for the adults). Fishers collected eggs using straw mats deployed on the sea surface. We can calculate CPUE based on the catch (in terms of weight) and effort (in terms of vessel number, or no. of straw mat deployed) data of the fishery. After several years of data collection, we can now understand the resource trend based on a standardized CPUE series calculated from fishery operations (such as vessel size, targeting vs. non-targeting, etc.) and environmental data (such as SST, rainfall, etc.). However, we also wish to know the possible sustainable yield of the fishery. Thus, we tried to use the CPUE and the data to estimate the MSY for the fishery, but such an approach may violate assumptions of the model as “egg” does not grow, and have a surplus production. An alternative way is to convert eggs caught (in terms of weight) to the biomass of the spawner (as the reproductive biology and the sex ratio of the species are available), and then estimate the MSY of the stock.
I wondering whether such an alternative approach is appropriate and valid for this purpose, and/or whether there are any other better approaches that can be used to estimate the possible sustainable yield of the fishery?
Any of your suggestions will be greatly appreciated.
More precisely, we're trying to identify the detailed species used as bait by pelagic longline fisheries targeting tuna-like species around the globe.
We're trying to evaluate from which fisheries fishermen source their bait and at what cost.
Working on fisheries management, I have been wondering how an institution (governmental or not) can acquire reliable fisheries catch data. How can the problems of under-reporting and mistrust be overcome, especially in the case of species caught illegally, either as by-catch or intentionally?
I am interested in any literature that details any situation where recreational or commercial fishermen and women offered some form of raw data that was used to assess or enhance management of a fishery. Could you please be species specific, or suggest a region, or a segment of a fishery?