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Article . 2012
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An interview-based assessment of the incidental capture and mortality of sea turtles in Mozambique´s Sofala Bank commercial shrimp fishery

Authors: Brito, A.;

An interview-based assessment of the incidental capture and mortality of sea turtles in Mozambique´s Sofala Bank commercial shrimp fishery

Abstract

Trawling for penaeid shrimps in Sofala Bank (central Mozambique) has been suggested to have major effects on the size of sea turtle populations. A total of 39 commercial fishers, fishery observers and enforcers were interviewed to assess the level of sea turtle catches in fishing operations and reported that at least 1,735±1,235 sea turtles are caught each fishing season of about seven months. Green turtle (Chelonia mydas, 48.4%), the loggerhead turtle (Caretta caretta, 25.8%) were the most common species, but catches also comprised the olive ridley (Lepidochelys olivacea),the hawksbill turtle (Eretmochelys imbricata) and the leatherback (Dermochelys coriacea). Over 54.8% of the incidents occur within a few miles of the small islands forming the Primeiras and Segundas archipelago in the northern one fifth section of the fishery. About 86% of the animals are hauled alive and around 14% (265±184)drown in the net each fishing season. While these rates of mortality are high owing to tow times lasting 3 hrs on average, they are lower than the ones reported in Australia and the US Gulf of Mexico and North Atlantic trawl fisheries. These results should be validated by onboard observations to be carried out during one fishing season before they can be considered for management. O arrasto comercial para camarões peneídeos do Banco de Sofala (centro do Moçambique) tem sido referido como tendo efeitos negativos sobre a população de tartarugas marinhas. Foram conduzidas 39 entrevistas com mestres de pesca, amostradores e fiscais de pesca para avaliar o nível de impacto desta pescaria sobre a população destas espécies, que reportaram que pelo menos 1.735±1.235 tartarugas marinhas são acidentalmente pescadas durante uma campanha de pesca de cerca de sete meses. A tartaruga verde (Chelonia mydas, 48,4%), a tartaruga cabeçuda (Caretta caretta, 25,8%) tem sido as mais frequentes, mas também tem sido pescadas a tartaruga olivácea (Lepidochelys olivacea), tartaruga de bico (Eretmochelys imbricata) e a tartaruga coriácea (Dermochelys coriacea). Mais de 54,8% dos incidentes ocorrem nas proximidades do Arquipélago das Primeiras e Segundas, uma quinta parte da área de pesca. Cerca de 86% das tartarugas são pescadas vivas e cerca de 14% (265±184) afogam-se na rede em cada campanha de pesca. Embora estas taxas de mortalidade possam ser elevadas, devido ao tempo de arrasto de três horas em média, as mesmas são mais baixas que as reportadas na Austrália e nos EUA. Estes resultados devem ser validados por observações a bordo da frota durante uma campanha de pesca completa, antes que possam ser considerados para a gestão da pescaria. Instituto Nacional de Investigação Pesqueira Published sea turtles incidental capture shrimps trawling

Keywords

Marine turtles, Shrimp fisheries, Prawns and shrimps, Trawling

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
Average
Average
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