منابع مشابه
The ecological setting of North Sea fisheries
Fisheries research has traditionally been largely concerned with direct interactions between fishing activ ities and individual fish stocks with a view of optimizing yields. This single species approach has been the basis for the common fisheries policy of the EEC aimed at managing fish stocks by means of catch quota. Although exploitation is undoubtedly a most important factor in the populatio...
متن کاملHind-Casting the Quantity and Composition of Discards by Mixed Demersal Fisheries in the North Sea
Many commercial fisheries seek to maximise the economic value of the catch that they bring ashore and market for human consumption by discarding undersize or low value fish. Information on the quantity, size and species composition of discarded fish is vital for stock assessments and for devising legislation to minimise the practice. However, except for a few major species, data are usually ext...
متن کاملThe Impact of Subsidies on the Ecological Sustainability and Future Profits from North Sea Fisheries
BACKGROUND This study examines the impact of subsidies on the profitability and ecological stability of the North Sea fisheries over the past 20 years. It shows the negative impact that subsidies can have on both the biomass of important fish species and the possible profit from fisheries. The study includes subsidies in an ecosystem model of the North Sea and examines the possible effects of e...
متن کاملModelling potential impacts of bottom trawl fisheries on soft sediment biogeochemistry in the North Sea†
Bottom trawling causes physical disturbance to sediments particularly in shelf areas. The disturbance due to trawling is most significant in deeper areas with softer sediments where levels of natural disturbance due to wave and tidal action are low. In heavily fished areas, trawls may impact the same area of seabed more than four times per year. A single pass of a beam trawl, the heaviest gear ...
متن کاملThe value of information in fisheries management: North Sea herring as an example
We take a decision theoretical approach to fisheries management, using a Bayesian approach to integrate the uncertainty about stock dynamics and current stock status, and express management objectives in the form of a utility function. The value of new information, potentially resulting in new control measures, is high if the information is expected to help in differentiating between the expect...
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ژورنال
عنوان ژورنال: Nature
سال: 1908
ISSN: 0028-0836,1476-4687
DOI: 10.1038/077523a0