Seabird attendance and incidental mortality at shrimp fisheries in Golfo San Jorge, Argentina

Many seabirds are attracted to trawl vessels to make use of fishery waste, and often this attraction results in increased incidental mortality. We assessed seabird attendance and associated incidental mortality at the Argentine red shrimpPleoticus muelleritrawl fishery in Golfo San Jorge, Argentina....

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Published in:Marine ecology. Progress series (Halstenbek) 2011-06, Vol.432, p.125-135
Main Authors: González-Zevallos, Diego, Yorio, Pablo, Svagelj, Walter S.
Format: Article
Language:English
Subjects:
Breeding
Coasts
Fisheries
Fisheries science
Mortality
Penguins
Sea birds
Seasons
Shrimp
Trawlers
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container_title Marine ecology. Progress series (Halstenbek)
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description Many seabirds are attracted to trawl vessels to make use of fishery waste, and often this attraction results in increased incidental mortality. We assessed seabird attendance and associated incidental mortality at the Argentine red shrimpPleoticus muelleritrawl fishery in Golfo San Jorge, Argentina. Information on seabird numbers was gathered in the autumn and winter 2006 and spring 2008, while information on seabird incidental captures was obtained for the period 2005–2007. Eighteen seabird species attended vessels, and the 2 most frequent and abundant seabirds (percent occurrence, median no. haul–1) were the kelp gullLarus dominicanus(>94%, 94%,
doi_str_mv 10.3354/meps09146
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Considering the fishery’s fishing effort during each month, the estimated total mortality in the study period was 895 (95% CI: 572 to 1339) penguins and 172 (95% CI: 69 to 305) cormorants. Over 95% of the recorded mortality occurred in 2005, the year when the trawling moratorium generally implemented in the area was not enforced. No interactions with warp cables were recorded. Results highlight the relevance of complying with the current moratorium scheme, as adjusting it to the penguin and cormorant breeding seasons may by a potentially effective management tool. 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subjects Breeding
Coasts
Fisheries
Fisheries science
Mortality
Penguins
Sea birds
Seasons
Shrimp
Trawlers
title Seabird attendance and incidental mortality at shrimp fisheries in Golfo San Jorge, Argentina
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