Integrated Catch-Age Mark-Recapture Model: Application to B.C. Sablefish Stocks
V. Haist
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Description
An integrated catch-age mark-recapture model is described along with its application to two British Columbia sablefish stocks. The model can be implemented with explicit migration or not, and the model structure includes age- and sex-specific depth stratification. Model parameters estimated through the analyses include recruitments, fishery parameters, emigration rates, tag loss rates, and tag reporting rates. The parameters of the catch age and mark-recapture components of the model are estimated simultaneously. The results indicate a high degree of correlation between tag loss and reporting rate but the estimated values for these parameters are precise and robust. The tag attrition rate is greater than would be expected from natural and fishing mortality rates alone. The model accounts for this with high values for the instantaneous tag loss rate (0.26-0.27). These values are significantly higher than would be expected if tag shedding were the major component of tag loss. Implementation of the migration component of the model does not provide a satisfactory fit to the observed tag recovery data, again because the tag attrition rate for migrant fish is greater than model predictions. A multi-stock model that explicitly accounts for immigration as well as emigration may resolve some of the remaining questions.
Item details
- Item number: AK-SG-98-01x
- Year: 1998
- DOI: https://doi.org/10.4027/fsam.1998.24
