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

ABSTRACT This 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 analy...

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Autores principales:	Vieira,Juliana M.S., Costa,Paulo A.S., Braga,Adriana C., São-Clemente,Ricardo R.B., Ferreira,Carlos E.L., Silva,Jodir P.
Lenguaje:	English
Publicado:	Pontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del Mar 2021
Materias:	Euthynnus alletteratus little tunny age growth reproduction size age structure southwestern Atlantic
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2021000500773
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spelling	oai:scielo:S0718-560X20210005007732021-11-25Age, growth, and maturity of little tunny, Euthynnus alletteratus (Rafinesque, 1810) in southeastern BrazilVieira,Juliana M.S.Costa,Paulo A.S.Braga,Adriana C.São-Clemente,Ricardo R.B.Ferreira,Carlos E.L.Silva,Jodir P. Euthynnus alletteratus little tunny age growth reproduction size age structure southwestern Atlantic ABSTRACT This 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.info:eu-repo/semantics/openAccessPontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del MarLatin american journal of aquatic research v.49 n.5 20212021-11-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2021000500773en10.3856/vol49-issue5-fulltext-2689
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Euthynnus alletteratus little tunny age growth reproduction size age structure southwestern Atlantic
spellingShingle	Euthynnus alletteratus little tunny age growth reproduction size age structure southwestern Atlantic Vieira,Juliana M.S. Costa,Paulo A.S. Braga,Adriana C. São-Clemente,Ricardo R.B. Ferreira,Carlos E.L. Silva,Jodir P. Age, growth, and maturity of little tunny, Euthynnus alletteratus (Rafinesque, 1810) in southeastern Brazil
description	ABSTRACT This 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.
author	Vieira,Juliana M.S. Costa,Paulo A.S. Braga,Adriana C. São-Clemente,Ricardo R.B. Ferreira,Carlos E.L. Silva,Jodir P.
author_facet	Vieira,Juliana M.S. Costa,Paulo A.S. Braga,Adriana C. São-Clemente,Ricardo R.B. Ferreira,Carlos E.L. Silva,Jodir P.
author_sort	Vieira,Juliana M.S.
title	Age, growth, and maturity of little tunny, Euthynnus alletteratus (Rafinesque, 1810) in southeastern Brazil
title_short	Age, growth, and maturity of little tunny, Euthynnus alletteratus (Rafinesque, 1810) in southeastern Brazil
title_full	Age, growth, and maturity of little tunny, Euthynnus alletteratus (Rafinesque, 1810) in southeastern Brazil
title_fullStr	Age, growth, and maturity of little tunny, Euthynnus alletteratus (Rafinesque, 1810) in southeastern Brazil
title_full_unstemmed	Age, growth, and maturity of little tunny, Euthynnus alletteratus (Rafinesque, 1810) in southeastern Brazil
title_sort	age, growth, and maturity of little tunny, euthynnus alletteratus (rafinesque, 1810) in southeastern brazil
publisher	Pontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del Mar
publishDate	2021
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2021000500773
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Age, growth, and maturity of little tunny, Euthynnus alletteratus (Rafinesque, 1810) in southeastern Brazil

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