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Age, growth, and maturity of little tunny, Euthynnus alletteratus (Rafinesque, 1810) in southeastern Brazil

dc.contributorBrazilian Ministry of the Environmenten-US
dc.contributorBrazilian Biodiversity Fund - FUNBIOen-US
dc.contributorMr. Edivaldo dos Santos Ribeiro (Perrota)en-US
dc.creatorVieira, Juliana M.S.
dc.creatorCosta, Paulo A.S.
dc.creatorBraga, Adriana C.
dc.creatorSão-Clemente, Ricardo R.B.
dc.creatorFerreira, Carlos E.L.
dc.creatorSilva, Jodir P.
dc.date2021-10-31
dc.date.accessioned2022-03-08T10:35:25Z
dc.date.available2022-03-08T10:35:25Z
dc.identifierhttp://lajar.ucv.cl/index.php/rlajar/article/view/vol49-issue5-fulltext-2689
dc.identifier10.3856/vol49-issue5-fulltext-2689
dc.identifier.urihttps://revistaschilenas.uchile.cl/handle/2250/179277
dc.descriptionThis is the first attempt to assess life parameters of little tunny Euthynnus alletteratus in the southwestern Atlantic. Fin spines, liver, and gonad information from 345 fishes (330-780 mm fork length) sampled from artisanal landings between March 2018, and February 2019 were used to analyze age, growth, and sexual maturity. Age was estimated by counting and measuring increments in sectioned spines, and the von Bertalanffy growth function was used to fit length-at-age data. There was no significant difference between male and female size distributions. Gonadosomatic index peaked from November to February in both sexes, associated with the South Atlantic Central Water (SACW) upwelling in temperatures between 15-18°C. Reproduction in cold waters has never been reported before and is possibly related to a richer environment for feeding and growth of larvae. The coefficient of variation among successive readings was 9.2%. The oldest fish was 5 years, and one annual increment for 2 and 3-year-old fish was observed to form associated with SACW. Little tunny growing in southeastern Brazil shows a higher growth rate and smaller asymptotic length when compared to most stocks in Mediterranean waters. Growth was not significantly affected by sex, and the von Bertalanffy growth parameters for all fish were L∞ = 791.9 mm, k = 0.42, and t0 = -0.97 yr-1. Length at first maturity is attained by 1-year-old fish of either sex (423-492 mm), suggesting that a small proportion (8%) of juveniles was recorded from fishery landings.en-US
dc.formatapplication/pdf
dc.languageeng
dc.publisherPontificia Universidad Católica de Valparaísoen-US
dc.relationhttp://lajar.ucv.cl/index.php/rlajar/article/view/vol49-issue5-fulltext-2689/1472
dc.rightsCopyright (c) 2021 Latin American Journal of Aquatic Researchen-US
dc.sourceLatin American Journal of Aquatic Research; Vol 49, No 5 (2021); 773-787en-US
dc.sourcePlataforma para envío de artículos - Latin American Journal of Aquatic Research; Vol 49, No 5 (2021); 773-787es-ES
dc.source0718-560X
dc.source0718-560X
dc.subjectEuthynnus alletteratus; little tunny; age; growth; reproduction; size; age structure; southwestern Atlanticen-US
dc.titleAge, growth, and maturity of little tunny, Euthynnus alletteratus (Rafinesque, 1810) in southeastern Brazilen-US
dc.typeinfo:eu-repo/semantics/article
dc.typeinfo:eu-repo/semantics/publishedVersion
dc.typeen-US
dc.typees-ES


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