An assessment of NAFO roughhead grenadier Subarea 2 and 3 stock
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AuthorsGonzález-Costas, F. (Fernando)
The aim of this paper is to present the status of NAFO roughhead grenadier Subarea 2 and 3 stock based on different assessments models using all the available information. Different assessment methods have been applied based on the data available: Extended Survivors Analysis, a Stock-Production Model Incorporating Covariates (ASPIC) and a qualitative assessment based on survey and fishery information. XSA results are considered uncertainties due to the low Fishing mortality estimated compare with the natural mortality level assumed and the high number of iterations needed to reach the convergence. ASPIC results make sense with historical data available for this stock despite the uncertainty in the B1/K parameter and the low contrast index value. Although all these problem both models results present a very similar trend in the fishing mortality and biomass values and are comparable to the qualitative assessment base on the surveys information. Biomass presents in all methods a general ...
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