Abstract
Abstract Stock assessments, which evaluate the effects of fishing on a fishery, are one basis of fishery management decisions. Stock assessments are based on fisheries data (a description of the catch and catching process), research vessel survey data, and qualitative information drawn from the observations of the harvesters and other knowledgeable observers. The fundamental model used as a basis for stock assessments and fishery management decisions takes account of four forces affecting biomass of the exploited population. These are growth, recruitment, natural mortality, and fishing mortality. Recruitment is the major source of variability in production of a fish population. The magnitude of past recruitment is estimated by application of virtual population analysis (VPA) to fisheries data. Future recruitment is predicted from current research vessel survey data and the relationship between survey catch rates and VPA estimates of recruitment during past years.
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