Assessment of Roughhead Grenadier, Macrourus berglax, in NAFO Subareas 2 and 3
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According the autumn Canadian survey (2J+3K) and the Spanish 3NO survey, the roughhead grenadier total biomass indices would indicate a general increasing trend from 1995 onwards. The catch / biomass (C/B) indexes obtained using the Canadian autumn survey and the Spanish 3NO biomass index in the period 1995-2004 show a clear decrease trend from 1995 to 2004, due to an increasing trend in the survey biomass and a decreased of catches. The Z estimate from the catch curve based upon commercial catch at age data (1992-2004) was 0.355 for ages 8 to 20, the value estimate from the catch curve of the UE Flemish Cap survey (1994-2004) was 0.511 for the same ages and 0.394 for the catch curve of the Spanish 3NO survey data (1997-2004). The Separable VPA (Pope and Shepherd, 1982) stock assessment model was fitted to the stock data, years 1993 to 2004 and ages 3 to 20, for the roughhead grenadier Subarea 2 and 3. The model seems to fit adequately the data. The results of the Separable VPA ...
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