Results for Greenland halibut from the surveys conducted by Spain in the NAFO Regulatory Area of Divisions 3NO, 1996-2003

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 in the realization of the trawls; so, the time series indices was transformed. The transformed entire series of mean catches, abundance, b...

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Bibliographic Details
Main Authors: González-Troncoso, D. (Diana), Román-Marcote, E. (Esther), Paz, X. (Xabier)
Format: Report
Language:English
Published: Centro Oceanográfico de Vigo 2004
Subjects:
Greenland
North Atlantic
Northeast Atlantic
Online Access:http://hdl.handle.net/10508/594
Description
Summary: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 in the realization of the trawls; so, the time series indices was transformed. The transformed entire series of mean catches, abundance, biomass and length distribution for Greenland halibut are presented for the period 1996-2000, and the no-transformed data for the years 2001-2003. The standard deviation are shown for abundance and biomass. The summed abundance and biomass based on conversion of the length frequencies are presented and compared to the estimates from the method used to convert the CPUE. A decreasing in Greenland halibut biomass and abundance is observed in last years (2000-2003). A high percent of juvenile individuals could indicate a good recruitment in recent years.

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