Results for the Roughead Grenadier from the Spanish Surveys Conducted in the NAFO Regulatory Area of Divisions 3NO, 1997-2004
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Since 1995, a stratified random spring bottom trawl survey in the NAFO Regulatory Area of Div. 3NO was conducted by Spain. In 2001, the trawl vessel was replaced; so, the time series indices were transformed. The transformed entire series of mean catches, biomass and length distribution for Roughead grenadier are presented for the period 1997-2000, and the no-transformed data for the years 2002-2004. In 2001, there are data from the two vessels. The summed biomass based on conversion of the length frequencies are presented and compared to the estimates from the method used to convert the CPUE. The indices of this species remains stable along the years, although an increasing is observed in last year (2004).
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