Stock Structure Of The Cod Fisheries
Stock Structure of the Cod Fisheries
Introduction
Fisheries management deals with populations or "stocks", usually in reference to geography. A stock is a population or a portion of a population, all members of which are characterised by similarities that are not heritable, but are induced by the environment. A stock may or may not include members of several different sub-populations. Subpopulations are a fraction of a population that is itself genetically self-sustaining. It is the smallest natural self-perpetuating unit. Although differences between sub-populations may be small they are heritable (Iverson, 1996). Members of a subpopulation segregate at spawning time, whereas members of a stock need not.
Effective management and resistance to exploitation, depend partly on how well these identified divisions reflect the lives and behaviour of fish. The fish in different stocks may differ in their size and growth rate, in the range they occupy, in their habits of migration and......
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