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Fish recruitment and environment
|Authors:||Larrañeta, M. G.|
|Publisher:||Consejo Superior de Investigaciones Científicas (España)|
|Citation:||Long term changes in marine fish populations: a symposium in Vigo, España, 18-21 Nov. 1986 (19889|
|Abstract:||The stock-recruitment relationship must be seen as the annual response, measured as survival, of the pre-recruits to environmental condictions, and of the existing population. This response has a real meaning. Every point represents an equilibrium state, which is not the case for example with the empirical points of the CPUE relationship.|
The ecological significance of the parameters of the stock-recruitment model of Ricker are analysed. It is not practical to search for a single stock-recruitment curve; there must be a distinct curve for each environmental atate of the fishery. Conversely, one can use the stock-recruitment curves to examine the ecological state of the fishery.
These ideas have been applied to the cod fishery of NAFO Divisions 2J3KL, and lead to the following conclusions: 1) In this fishery, salinity as a hydrographical signal is more closely related to recruitment variations than water temperature. 2) Hydrographic changes modify the stock-recruitment relation more as a result of chnages in primary production, than through any direct effect of salinity or temperature on the pre-recruits. 3) From the point of view of fisheries management, natural changes in productivity will have more impact on maximum sustainable yield than on the value of Fmax.
|Description:||16 páginas, 4 figuras, 2 tablas, 1 apéndice|
|Appears in Collections:||(IIM) Libros y partes de libros|
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|Larrañeta_fish_recruitment_1988.pdf||1,45 MB||Adobe PDF|