The incidental capture of seabirds by Spanish drifting longline fisheries in the western Mediterranean Sea

Valeiras, J.; Camiñas, Juan Antonio

doi:10.3989/scimar.2003.67s265

Cited by 18 publications

(25 citation statements)

References 4 publications

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“…Spain undertakes both pelagic and demersal longlining in the Mediterranean, respectively directed at swordfish and tuna, and hake and breams of the genera Pagrus, Pagellus and Dentex (Folsom, 1997;Raymakers and Lynham, 1999;Valeiras and Camiñas, 2003;Belda and Sánchez, 2001). Longline fishing undertaken around the Columbretes (43 vessels) and Balearic Islands, in the Gulf of Valencia, has been reported to kill seabirds, primarily Cory's shearwaters and Audouin's and yellow-legged gulls, as well as Balearic shearwaters, northern gannets, a European shag Phalacrocorax aristostelis and a great skua Catharacta skua (Mayol, 1986;Aguilar, 1998;Sánchez and Belda, 2000a;Belda and Sánchez, 2001).…”

Section: Spainmentioning

confidence: 99%

“…Twenty-one birds (nine Cory's shearwaters, one northern gannet and 11 yellow-legged gulls) were reported caught, giving a catch rate of 0.013 birds/1000 hooks (Valeiras and Camiñas, 2003). Nothing is known about seabird mortality from Spanish pelagic longline vessels operating elsewhere in the Mediterranean Sea, although it is assumed to occur (Raymakers and Lynham, 1999).…”

Section: Spainmentioning

confidence: 99%

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Seabird mortality from longline fishing in the Mediterranean Sea and Macaronesian waters: a review and a way forward

et al. 2003

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SUMMARY: A country-by-country review of seabird mortality from longline fishing in the Mediterranean Sea and in Macaronesian waters shows a paucity of data. Of 12 Mediterranean countries known to undertake longlining, seabird mortality is only reported for six: France, Greece, Italy, Malta, Spain and Tunisia. Seabird mortality from longlining has been reported from the Azores (Portugal) but not from the other Macaronesian Islands. Only for one country, Spain, is information on the levels of mortality available, suggesting that 4-6% of the local breeding population of Cory's shearwater Calonectris diomedea may be killed annually, a level considered unsustainable for the long-term persistence of colonies. Cory's shearwater is the most commonly affected species, although a number of Larus gull species are also being caught. There is insufficient knowledge to conclude whether any seabird species is at conservation risk within the region, but concern is expressed for Cory's shearwater. It is recommended that Mediterranean and Macaronesian countries conduct assessments of their longline fisheries and seabird mortality in terms of the Food and Agriculture Organization's International Plan of ActionSeabirds. Regional fishery organisations, such as ICCAT and GFCM, should commence the collection of seabird mortality data. A "longline action plan" for the affected seabird species should be produced.Key words: seabirds, longline fishing, conservation, Mediterranean, Macaronesia. RESUMEN: MORTALIDAD DE AVES MARINAS EN PALANGRES DEL MAR MEDITERRÁNEO E ISLAS MACARONESIAS: REVISIÓN Y PRO-PUESTAS DEFUTURO. -Este trabajo presenta una revisión de la escasa información disponible sobre mortalidad de aves marinas en las flotas palangreras del mar Mediterráneo y Macaronesia. De los 12 países mediterráneos que disponen de flota palangrera tan sólo 6 han aportado información sobre mortalidad de aves marinas: Francia, Grecia, Italia, Malta, España y Túnez. También se sabe que existe mortalidad de aves marinas en las islas Azores (Portugal) pero no en el resto de las islas de la Macaronesia. Tan sólo España dispone de información sobre niveles de mortalidad. Es posible que entre el 4-6% de la población reproductora local de pardela cenicienta Calonectris diomedea muera en el palangre anualmente, un nivel que se considera insostenible para la persistencia a largo plazo de las colonias. La pardela cenicienta es la especie más afectada, aunque también se capturan gaviotas del género Larus. Aunque no se sabe lo suficiente como para concluir si alguna especie de ave marina está amenazada localmente por el palangre, se sugiere que la pardela cenicienta sí puede estarlo. Se recomienda que los países mediterráneos y macaronésicos lleven a cabo valoraciones de sus pesquerías de palangre y de la mortalidad de aves marinas en los términos de los planes internacionales de acción de la FAO. Las organizaciones pesqueras

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Section: Spainmentioning

confidence: 99%

Section: Spainmentioning

confidence: 99%

Seabird mortality from longline fishing in the Mediterranean Sea and Macaronesian waters: a review and a way forward

et al. 2003

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“…The fishing grounds include a large area of the western Mediterranean between 36º and 44ºN and 02ºW and 05ºE. The strongest fishing effort is carried out around the Balearic Islands and in the Ibiza Channel (Camiñas and de la Serna, 1995;Camiñas and Valeiras, 2001;Valeiras and Camiñas, 2003).…”

Section: Methodsmentioning

confidence: 99%

“…fishing strategies, and fleet dynamics (see Valeiras and Camiñas, 2003). We classified the fleet into six boat strata with some differences in structure and target species (Table 1).…”

Section: Target Speciesmentioning

confidence: 99%

“…As the catch per unit effort (CPUE) measure we used the index R (number of incidental catches / number of hooks -3 ), R dead (number of direct turtle mortalities / number of hooks -3 ) (Yeung, 1998;Laurent et al, 2001;Valeiras and Camiñas, 2003;Lewison et al, 2004), F rate (number of incidental catches / number of fishing operations), and F dead (number of direct mortalities / number of fishing operations). We tested the inter-annual differences in R and F within boat strata and gear, and differences in R, R dead , F, and F dead among boat strata and gears with data from all years pooled together, using the chi-squared (χ 2 ) test.…”

Section: Target Speciesmentioning

confidence: 99%

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Differential loggerhead by-catch and direct mortality due to surface longlines according to boat strata and gear type

et al. 2006

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SUMMARY: Surface longline gears are used to fish different species, mainly albacore Thunnus alalunga (Bonnaterre, 1788), bluefin tuna Thunnus thynnus (Linnaeus, 1758), and swordfish Xiphias gladius Linnaeus, 1758, and are considered highly dangerous for threatened marine turtles. Loggerheads Caretta caretta (Linnaeus, 1758) can be incidentally captured by surface longlines. A number of captured individuals die during the fishing operation, which we consider direct mortality due to fishing. We analysed the relative loggerhead by-catch and direct mortality associated with each type of boat and gear from April to December during the period 1999-2004 in the Spanish surface longline fleet that fishes in the western Mediterranean Sea, an important fishing area for this fleet. We used different indices to compute the catch per unit effort (CPUE) according to the number of hooks and to the number of fishing operations for each type of boat and gear. Both bycatch and direct mortality differed significantly according to the type of boat and gear. With respect to the number of hooks, boats longer than 12 m not using a roller and targeting bluefin tuna captured the highest number of loggerheads, whereas boats longer than 12 m with a roller that targeted swordfish caused the highest direct mortality. With respect to the number of fishing operations, boats longer than 12 m without a roller that targeted albacore captured the highest number of loggerheads; the highest direct mortality was caused by this type of boat and by boats longer than 12 m using a roller and targeting swordfish.Keywords: Caretta caretta, drifting longline, fisheries, incidental capture, pre-release mortality, sea turtle. -El palangre de superficie es usado para la pesca de diferentes especies, fundamentalmente atún blanco Thunnus alalunga (Bonnaterre, 1788), atún rojo Thunnus thynnus (Linnaeus, 1758) y pez espada Xiphias gladius Linnaeus, 1758, y es considerado altamente peligroso para las tortugas marinas amenazadas. La tortuga boba Caretta caretta (Linnaeus, 1758) puede ser capturada incidentalmente por el palangre de superficie y un número considerable de ellas puede morir durante la operación de pesca, y son consideradas como muertas directamente en el palangre. En este trabajo se analizan la capturas incidentales y la mortalidad directa relativa asociada a cada tipo de barco y aparejo de pesca, desde abril a diciembre durante el periodo 1999-2004, en la flota palangrera española en el Mediterráneo occidental, una importante área de pesca para esta flota. Se usaron diferentes índices para calcular las capturas por unidad de esfuerzo (CPUE) de acuerdo al número de anzuelos y al número de operaciones de pesca para cada tipo de barco y aparejo. Tanto las capturas no dirigidas de la tortuga boba como la mortalidad directa presentan diferencias significativas en función del tipo de barco y aparejo. Con respecto al número de anzuelos, los barcos mayores de 12 m de eslora sin rulo y especie objetivo atún rojo presentaron el mayor número de capturas relativ...

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Cory’s shearwater by-catch in the Mediterranean Spanish commercial longline fishery: implications for management

et al. 2014

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The incidental capture of seabirds by Spanish drifting longline fisheries in the western Mediterranean Sea

Cited by 18 publications

References 4 publications

Seabird mortality from longline fishing in the Mediterranean Sea and Macaronesian waters: a review and a way forward

Seabird mortality from longline fishing in the Mediterranean Sea and Macaronesian waters: a review and a way forward

Differential loggerhead by-catch and direct mortality due to surface longlines according to boat strata and gear type

Cory’s shearwater by-catch in the Mediterranean Spanish commercial longline fishery: implications for management

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