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Changes in population structure and growth of skipjack tuna, Katsuwonus pelamis during 30 years of exploitation in the southwestern Atlantic

dc.contributoren-US
dc.contributores-ES
dc.creatorGarbin, Thais
dc.creatorCastello, Jorge P.
dc.date2017-03-09
dc.date.accessioned2020-11-05T13:35:26Z
dc.date.available2020-11-05T13:35:26Z
dc.identifierhttp://lajar.ucv.cl/index.php/rlajar/article/view/vol42-issue3-fulltext-13
dc.identifier10.3856/vol42-issue3-fulltext-13
dc.identifier.urihttps://revistaschilenas.uchile.cl/handle/2250/158581
dc.descriptionThe skipjack tuna is the main tuna species caught in Brazil with pole and live-bait. Samples taken during 1984-1986 and the 2004-2009 periods provided length, weight and age data. A comparison of the population structure was made showing a decrease in the median and means of fork length in the 80`s (median: 55 cm) and recent years (median: 51 cm), an increased participation of smaller individuals (40 cm) in recent catches, a high variability of lengths in each year class and a decrease of the condition factor K. These results indicate alterations in the population structure and dynamics. The von Bertalanffy growth parameters calculated for the recent years were L∞ = 925 mm; k = 0.16 year-1; to = -2.9. CPUE data for the studied period seems to be stable (mean annual catch of 20,000 ton). However, the unit of effort used in Brazil (fishing days) does not reflect changes in fishing power and technology properly as occurred during 30 years of exploitation. It is concluded that the present situation requires a close monitoring of the fishery.en-US
dc.descriptiones-ES
dc.formatapplication/pdf
dc.languageeng
dc.publisherPontificia Universidad Católica de Valparaísoen-US
dc.relationhttp://lajar.ucv.cl/index.php/rlajar/article/view/vol42-issue3-fulltext-13/464
dc.relationhttp://lajar.ucv.cl/index.php/rlajar/article/downloadSuppFile/vol42-issue3-fulltext-13/123
dc.relationhttp://lajar.ucv.cl/index.php/rlajar/article/downloadSuppFile/vol42-issue3-fulltext-13/124
dc.relationhttp://lajar.ucv.cl/index.php/rlajar/article/downloadSuppFile/vol42-issue3-fulltext-13/125
dc.sourceLatin American Journal of Aquatic Research; Vol 42, No 3 (2014); 534-546en-US
dc.sourcePlataforma para envío de artículos - Latin American Journal of Aquatic Research; Vol 42, No 3 (2014); 534-546es-ES
dc.source0718-560X
dc.source0718-560X
dc.subjectKatsuwonus pelamis; skipjack; population structure; weight-length relationship; condition factor; growth; CPUE; southwestern Atlanticen-US
dc.subjectes-ES
dc.titleChanges in population structure and growth of skipjack tuna, Katsuwonus pelamis during 30 years of exploitation in the southwestern Atlanticen-US
dc.titlees-ES
dc.typeinfo:eu-repo/semantics/article
dc.typeinfo:eu-repo/semantics/publishedVersion
dc.typeen-US
dc.typees-ES


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