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Description:A state-space stock assessment model was applied to last year’s Georges Bank yellowtail flounder data with three different values of natural mortality. The model results had small retrospective patterns and fit the indices well. There was a consistent, strong pattern in the residuals between observed and predicted total catch in weight, despite the residuals for catch at age not showing a strong pattern. This pattern was for the predicted total catch to be well below the observed catch early in the assessment period and well above the observed catch in recent years. The three models consistently estimated low recent adult biomass and recruitment and high fishing mortality rate over the entire assessment period. The adult biomass and recruitment results are consistent with the other state-space model application being presented at this meeting (WP08). The total mortality rate, fishing plus natural mortalities, is also consistently estimated by the two sets of state-space models.
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Rights Information:Public Domain
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