Survival of small-spotted catshark (Scyliorhinus canícula, L.) discarded by trawlers in the Cantabrian Sea.
Discards represent a significant percentage of the total catches (up to 35%) in the north of Spain trawl fishery. In the Cantabrian Sea (southern area of the Bay of Biscay), the estimated average total annual catch of small-spotted catshark (Scyliorhinus canicula) is approximately 1500 tn, from whic...
| Autores: | , , , |
|---|---|
| Tipo de documento: | artigo |
| Data de publicação: | 2005 |
| País: | España |
| Recursos: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositório: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/326790 |
| Acesso em linha: | http://hdl.handle.net/10261/326790 |
| Access Level: | Acceso aberto |
| Palavra-chave: | Centro Oceanográfico de Santander Pesquerías |
| Resumo: | Discards represent a significant percentage of the total catches (up to 35%) in the north of Spain trawl fishery. In the Cantabrian Sea (southern area of the Bay of Biscay), the estimated average total annual catch of small-spotted catshark (Scyliorhinus canicula) is approximately 1500 tn, from which 80% is discarded. Several experiments have been carried out in order to estimate the survival-rate of the small-spotted catshark caught by commercial trawlers in this area. The estimate of mean survival-rate from tagging surveys was 90% while from commercial trawlers it was 78%. Several factors potentially influencing the survival-rate (sex, length, maximum depth fished, sorting time and trawl duration) were examined. No significant differences in survival-rates were found between males and females, and no strong relationships between survival-rate and depth fished, sorting time or trawl duration were evident. In commercial trawlers survival-rate was not dependent on the fish length. |
|---|