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Mortality estimates of Scyliorhinus canicula in the Cantabrian sea using tag-recapture data

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Survival and recovery rates were obtained for small‐spotted catshark Scyliorhinus canicula in the Cantabrian Sea (north of Spain) based on tagging data. A total of 7656 specimens were tagged from 1993 to 2001. Recovery models for multiyear tagging studies were applied using the programme Mark. The best model fitted was achieved considering constant survival and recovery rates following the Brownie parameterization. The outputs were a survival rate (S) 0·89 and a recovery rate (f) 0·006. The reduced parameterization (S and r) provided very similar results, 0·89 and 0·06 respectively. The total finite mortality estimated was therefore Z = 0·11.

Keywords: Cantabrian Sea; Scyliorhinus canicula; mortality; recovery rate; tagging

Document Type: Regular Paper


Affiliations: Instituto Español de Oceanografía. Apdo. 240. Santander 39080, Spain

Publication date: April 1, 2005


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