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Understanding pelagic stingray (Pteroplatytrygon violacea) by-catch by Spanish longliners in the Mediterranean Sea

Published online by Cambridge University Press:  11 August 2015

José C. Báez ,
Guillermo Ortuño Crespo ,
Salvador García-Barcelona ,
José M. Ortiz De Urbina  and
David Macías
José C. Báez*
Affiliation:
Instituto Español de Oceanografía, Centro Oceanográfico de Málaga, Puerto pesquero s/n Fuengirola, Málaga, Spain Investigador asociado de la Facultad de Ciencias de la Salud, Universidad Autónoma de Chile, Chile
Guillermo Ortuño Crespo
Affiliation:
Instituto Español de Oceanografía, Centro Oceanográfico de Málaga, Puerto pesquero s/n Fuengirola, Málaga, Spain
Salvador García-Barcelona
Affiliation:
Instituto Español de Oceanografía, Centro Oceanográfico de Málaga, Puerto pesquero s/n Fuengirola, Málaga, Spain
José M. Ortiz De Urbina
Affiliation:
Instituto Español de Oceanografía, Centro Oceanográfico de Málaga, Puerto pesquero s/n Fuengirola, Málaga, Spain
David Macías
Affiliation:
Instituto Español de Oceanografía, Centro Oceanográfico de Málaga, Puerto pesquero s/n Fuengirola, Málaga, Spain
*
Correspondence should be addressed to:J.C. Báez, Instituto Español de Oceanografía, Centro Oceanográfico de Málaga, Puerto pesquero s/n Fuengirola, Málaga, Spain email: jcarlos.baez@ma.ieo.es
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Abstract

The pelagic stingray Pteroplatytrygon violacea is known to be a frequent by-catch in longline fisheries worldwide. This study analysed the eco-geographic, technical and temporal parameters that affect pelagic stingray by-catch by the Spanish surface drifting longline fleet that operates in the Mediterranean Sea. Between 2000 and 2013, 3007 longline fishing operations were monitored. Over this period, we recorded 57 574 pelagic stingray by-catches by this fleet. Two gear types were involved in 96.05% of the pelagic stingray by-catch observed: traditional surface longliners targeting swordfish (LLHB) and surface drifting longliners targeting albacore (LLALB). We obtained two statistically significant explanatory models for the two types of gear. In both cases, two of the most important variables were fisheries being sited over the continental shelf and fishing during the summer season. The LLHB explanatory model included the following variables: number of hooks, latitude where setting started, distance between the ends of the longline, and the spring season. Regarding the LLHB, we found an association between the Capture per Unit Effort of pelagic stingray from favourable sets per year and the North Atlantic Oscillation in the previous year.

Keywords

By-catchlonglinepelagic stingrayPteroplatytrygon violacea
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 96 , Issue 7 , November 2016 , pp. 1387 - 1394
Copyright
Copyright © Marine Biological Association of the United Kingdom 2015 

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