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Fish recruitment and environment

AuthorsLarrañeta, M. G.
Issue Date1988
PublisherConsejo Superior de Investigaciones Científicas (España)
CitationLong term changes in marine fish populations: a symposium in Vigo, España, 18-21 Nov. 1986 (19889
AbstractThe 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.
Description16 páginas, 4 figuras, 2 tablas, 1 apéndice
Appears in Collections:(IIM) Libros y partes de libros
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