Northern Shrimp (Pandalus borealis) on Flemish Cap Surveys 2003 and 2004
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AuthorsCasas-Sánchez, J.M. (José Miguel); Río-Iglesias, J.L. (José Luis) del; González-Troncoso, D. (Diana)
Since 1988, a stratified random summer bottom trawl survey in Flemish Cap (NAFO Regulatory Area of Div. 3M) was conducted by UE. Since 2003 the trawl vessel was replaced, the new vessel was calibrated and the indexes transformed. The lack of time has no permitted to transform the biomass and abundance shrimp indexes of the whole time series. So, the indexes in the series from 1988 to 2002 have not been changed by now and only the 2003 and 2004 indexes from the R/V Vizconde de Eza have been transformed to the R/V Cornide de Saavedra scale, to make them comparable to the results obtained in previous years. The shrimp catches taken with the same gear type Lofoten by both vessels from comparative fishing trials were very different, not only in weight but also in number. These results were interpreted on main differences between both vessels: trawl winch with an automatic control of the warp tension, higher vertical opening in the net and trawl warp length longer in the new vessel. Also, in ...
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