Dynamics of a Migratory Fish Population with Applications to the Management of Sablefish
J. Heifetz and T.J. Quinn II
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The reproduction, mortality, and migration of an age-structured fish population can be incorporated into a matrix model. The population projection matrix for such a model describes the dynamics of age classes within regions and the migration among regions. Such a model provides a flexible framework to examine the dynamics of a migratory fish population. The model can be parameterized to include regional specificity in the stock recruitment relationship as well as larval dispersal that is decoupled from local reproduction. The subject of oriented movement, where young fish tend to migrate in the opposite direction of older fish is examined within the context of the sablefish (Anoplopoma fimbria) fishery in the northeast Pacific Ocean. We show that fishing at a common rate among regions may be appropriate for the pooled population but may be detrimental to the population in a given region. As an alternative, region-specific fishing strategies can be devised to meet fishery management objectives such as maintenance of regional spawning potential.
- Item number: AK-SG-98-01l
- Year: 1998
- DOI: https://doi.org/10.4027/fsam.1998.12