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Fish stocks indicators, which is normalized as a 0–100 proximity-to-target score, with 100 representing "at target" and 0 being furthest from the target. Stock assessments provide fisheries managers with the information that is used in the regulation of a fish stock. Biological and fisheries data are collected in a stock assessment.
In fisheries science and ecology, stock assessment is an important tool in fisheries management. In particular, to ensure continued, healthy, fish stocks, measurements of the Spawning Stock Biomass (the stock population capable of reproducing) allows sensible conservation strategies to be developed and maintained through the application of ...
Carl Walters (born 1944) is an American-born Canadian biologist known for his work involving fisheries stock assessments, the adaptive management concept, and ecosystem modeling. [1] Walters has been a professor of Zoology and Fisheries at the University of British Columbia since 1969. [ 2 ]
Fisheries managers use stock assessments to help determine if a stock is overfished, measuring the maximum sustainable yield. [25] If a stock is designated as overfished, annual catch limits need to be low enough to allow stocks to rebuild. [23] Worldwide, about one-third of fish stocks are being fished at biologically unsustainable levels. [26]
This means that decisions about stock management can also be made by the people doing the harvesting. [1] The best practice is to standardise the effort employed (e.g. number of traps or duration of searching), which controls for the reduction in catch size that often results from subsequent efforts. [2]
In fisheries terms, maximum sustainable yield (MSY) is the largest average catch that can be captured from a stock under existing environmental conditions. [21] MSY aims at a balance between too much and too little harvest to keep the population at some intermediate abundance with a maximum replacement rate.
Ray Hilborn (born 1947) is a marine biologist and fisheries scientist, known for his work on conservation and natural resource management in the context of fisheries.He is currently professor of aquatic and fishery science at the University of Washington.
Today, due to the pre-allocation of catch that accompanies IFQs, the season lasts nearly eight months and boats deliver fresh fish at a steadier pace. However, halibut stocks have been in continuous decline for over a decade, as poor stock assessments leading to overfishing have caused a substantial decline in biomass. Additionally, despite the ...