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|Title:||The sensitivity of long-term yield targets to changes in fishery age-selectivity|
|Authors:||SCOTT ROBERT; SAMPSON DAVID|
|Citation:||MARINE POLICY vol. 35 no. 1 p. 79-84|
|Publisher:||ELSEVIER SCI LTD|
|JRC Publication N°:||JRC59165|
|Type:||Articles in Journals|
|Abstract:||Maximum sustainable yield (MSY) has been adopted as the primary management goal by several inter-governmental fishery organisations and in the United States it forms the corner-stone of federal fishery management policy. MSY became a strategic goal for the management of Europe's fisheries following the decision of the World Summit on Sustainable Development in 2002. Calculation of MSY requires information on the rate at which biomass increases through growth and reproduction and the rate at which it decreases through natural mortality and fishing. Population-selection, which measures the age-specific rates of fishing mortality, is a key component to the calculation of yield as a function of fishing mortality and MSY yet selection rarely features in either management advice or sensitivity analyses. Effective management of selection can potentially lead to increases in long-term yield, but before any action is taken managers first need to understand what long-term increases are possible. Using a hypothetical stock, equilibrium yield curves were calculated for a number of different scenarios in which the functional form of the population-selection curve varied. The results illustrate the potential extent of variation in MSY and FMSY that may result solely as a consequence of changes in population-selectivity. They show that substantial differences in MSY and FMSY can result from relatively subtle changes in selection. The results are discussed with specific reference to the development of long-term management targets and the mechanisms by which managers might try to influence population-selection.|
|JRC Institute:||Institute for the Protection and Security of the Citizen|
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