Standardized CPUE Indices for Greenland Halibut and American Plaice in NAFO Divisions 3LMNO Based on Spanish Commercial Catch Rates
Standardized cpue series using a Generalized Linear Model for Greenland halibut and American plaice in Division 3LMNO, based on catch and effort data from the Spanish trawl fleet since 1990 at depth intervals are presented. In the case of the Greenland halibut series, the largest proportion of the v...
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| Format: | Report |
| Language: | English |
| Published: |
2001
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| Subjects: | |
| Online Access: | http://hdl.handle.net/10508/885 http://hdl.handle.net/10261/328646 |
| Summary: | Standardized cpue series using a Generalized Linear Model for Greenland halibut and American plaice in Division 3LMNO, based on catch and effort data from the Spanish trawl fleet since 1990 at depth intervals are presented. In the case of the Greenland halibut series, the largest proportion of the variance (45%) is explained by the factor ‘depth’, while in the American plaice on it is the factor ‘vessel’ (51%). The general trend observed in the Greenland halibut standardized CPUE in all divisions is a sharp increase in the indices from about 600 m, attaining maximum values between 900-1 000 m, and then decreasing at depths beyond 1 200 m. American plaice CPUE values at depths less than 500 m are very small in all divisions. The American plaice cpue series show two peaks one between 100-200 m. and the other between 400-500 m, decreasing sharply thereafter. The larger values in this species are observed in Div. 3L and 3N, while very small ones are in Div. 3M at any depth. |
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