An analytical assessment of NAFO roughhead grenadier Subareas 2 and 3 stock.
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Catch and research survey data from 1992-2005 on the roughhead grenadier stock in NAFO Subareas 2 and 3 are fitted to the eXtended Survivors Analysis (XSA) model. The model results indicated that the stock biomass has been increasing from 1996 to 2005. The biomass estimated for the beginning of 2005 was around 70.000 tonnes, the highest in the time series. Fishing mortality has declined since 1999 and showed the lowest value in the time series in 2005. Over the last few years, there have been two years with very good recruitment at age 3, which may increase the exploitable biomass in the future. The assessment results showed that the current roughhead grenadier Subarea 2 and 3 stock status is healthy. While the analysis indicated that there was a clear retrospective pattern in the model estimates (i.e., fishing mortality being underestimated and total biomass overestimated), the sensitivity analysis showed that the results were robust to the model set up. Although the short ...
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