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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. The depth strata surveyed was extended to 1464 m. The main propose of the surveys was obtain abundance and biomass indices and population structure for the commercial species in...
| Main Authors: | , , |
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| Other Authors: | |
| Format: | Text |
| Language: | English |
| Published: |
2003
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| Subjects: | |
| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.519.5652 http://archive.nafo.int/open/sc/2003/scr03-008.pdf |
| Summary: | Since 1995, a stratified random spring bottom trawl survey in the NAFO Regulatory Area of Div. 3NO was conducted by Spain. The depth strata surveyed was extended to 1464 m. The main propose of the surveys was obtain abundance and biomass indices and population structure for the commercial species in the area. 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 abundance, biomass and length distribution for Greenland halibut are presented for the period 1996-2000, and the no-transformed data for the years 2001 and 2002. The standard deviation are shown for abundance and biomass. A decreasing in Greenland halibut biomass is observed in last years. A high percent of juvenile individuals shows a good recruitment in recent years. Material and methods Survey design and gear used The surveys on NAFO Regulatory Area of Div. 3NO was initiated by Spain in 1995. Until 2001, the surveys was carried out in spring (May), on board the Spanish vessel C/V Playa de Menduiña (338 GT and 800 HP) using bottom trawl net type Pedreira. Since that year, the R/V Vizconde de Eza replaced the C/V Playa de Menduíña as the research vessel for the trawl, using bottom trawl net type Campelen. The main specifications and geometry of these |
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