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Understanding pelagic stingray (Pteroplatytrygon violacea) by-catch by Spanish longliners in the Mediterranean Sea
Báez, J.C.; Ortuño Crespo, G.; García-Barcelona, S.; Ortiz de Urbinaa1, J.M.; Macías, D. (2016). Understanding pelagic stingray (Pteroplatytrygon violacea) by-catch by Spanish longliners in the Mediterranean Sea. J. Mar. Biol. Ass. U.K. 96(7): 1387-1394. https://hdl.handle.net/10.1017/S0025315415001253
In: Journal of the Marine Biological Association of the United Kingdom. Cambridge University Press/Marine Biological Association of the United Kingdom: Cambridge. ISSN 0025-3154, more
Peer reviewed article  

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Keywords
    By catch; Longline; Pteroplatytrygon violacea (Bonaparte, 1832) [WoRMS]; Marine
Author keywords
    Pelagic stingray

Authors  Top 
  • Báez, J.C.
  • Ortuño Crespo, G.
  • García-Barcelona, S.
  • Ortiz de Urbinaa1, J.M.
  • Macías, D.

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.

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