Age, growth and mortality of southern rays bream Brama australis (Bramidae) off the southeastern Pacific coast

The age and growth function and mortality were determined for southern rays bream Brama australis caught in commercial trawls off the coast of central Chile. The results show that this species grows quickly in the first year and reaches the maximum asymptotic length (59 cm) at approximately 8 or 9 y...

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Autores principales:	Oyarzún,Ciro, Cortés,Nelson, Leal,Elson
Lenguaje:	English
Publicado:	Universidad de Valparaíso. Facultad de Ciencias del Mar 2013
Materias:	Bramidae age and growth mortality eastern South Pacific southern rays bream
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-19572013000300014
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spelling	oai:scielo:S0718-195720130003000142014-04-08Age, growth and mortality of southern rays bream Brama australis (Bramidae) off the southeastern Pacific coastOyarzún,CiroCortés,NelsonLeal,Elson Bramidae age and growth mortality eastern South Pacific southern rays bream The age and growth function and mortality were determined for southern rays bream Brama australis caught in commercial trawls off the coast of central Chile. The results show that this species grows quickly in the first year and reaches the maximum asymptotic length (59 cm) at approximately 8 or 9 years old. The von Bertalanffy growth function described B. australis growth satisfactorily with length-at-age determined using otolith analysis. Parameters for the entire population (males and females) were: for length, L∞ = 58.95 cm, K = 0.277 yr-1, t o = -0.371 yr; and for weight, W∞ = 2508.8 g, K = 0.257 yr-1, t o = -0.712 yr. No differences were found in length-at-age between sexes. Estimates of total mortality rates (Z) from maximum age and catch-curve analyses were relatively high (0.9 year-1). The natural mortality rate (M = 0.45 yr-1) is consistent with the life parameters of middle-sized pelagic fish with relatively low exploitation at the time of sampling.info:eu-repo/semantics/openAccessUniversidad de Valparaíso. Facultad de Ciencias del MarRevista de biología marina y oceanografía v.48 n.3 20132013-12-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-19572013000300014en10.4067/S0718-19572013000300014
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Bramidae age and growth mortality eastern South Pacific southern rays bream
spellingShingle	Bramidae age and growth mortality eastern South Pacific southern rays bream Oyarzún,Ciro Cortés,Nelson Leal,Elson Age, growth and mortality of southern rays bream Brama australis (Bramidae) off the southeastern Pacific coast
description	The age and growth function and mortality were determined for southern rays bream Brama australis caught in commercial trawls off the coast of central Chile. The results show that this species grows quickly in the first year and reaches the maximum asymptotic length (59 cm) at approximately 8 or 9 years old. The von Bertalanffy growth function described B. australis growth satisfactorily with length-at-age determined using otolith analysis. Parameters for the entire population (males and females) were: for length, L∞ = 58.95 cm, K = 0.277 yr-1, t o = -0.371 yr; and for weight, W∞ = 2508.8 g, K = 0.257 yr-1, t o = -0.712 yr. No differences were found in length-at-age between sexes. Estimates of total mortality rates (Z) from maximum age and catch-curve analyses were relatively high (0.9 year-1). The natural mortality rate (M = 0.45 yr-1) is consistent with the life parameters of middle-sized pelagic fish with relatively low exploitation at the time of sampling.
author	Oyarzún,Ciro Cortés,Nelson Leal,Elson
author_facet	Oyarzún,Ciro Cortés,Nelson Leal,Elson
author_sort	Oyarzún,Ciro
title	Age, growth and mortality of southern rays bream Brama australis (Bramidae) off the southeastern Pacific coast
title_short	Age, growth and mortality of southern rays bream Brama australis (Bramidae) off the southeastern Pacific coast
title_full	Age, growth and mortality of southern rays bream Brama australis (Bramidae) off the southeastern Pacific coast
title_fullStr	Age, growth and mortality of southern rays bream Brama australis (Bramidae) off the southeastern Pacific coast
title_full_unstemmed	Age, growth and mortality of southern rays bream Brama australis (Bramidae) off the southeastern Pacific coast
title_sort	age, growth and mortality of southern rays bream brama australis (bramidae) off the southeastern pacific coast
publisher	Universidad de Valparaíso. Facultad de Ciencias del Mar
publishDate	2013
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-19572013000300014
work_keys_str_mv	AT oyarzunciro agegrowthandmortalityofsouthernraysbreambramaaustralisbramidaeoffthesoutheasternpacificcoast AT cortesnelson agegrowthandmortalityofsouthernraysbreambramaaustralisbramidaeoffthesoutheasternpacificcoast AT lealelson agegrowthandmortalityofsouthernraysbreambramaaustralisbramidaeoffthesoutheasternpacificcoast
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Age, growth and mortality of southern rays bream Brama australis (Bramidae) off the southeastern Pacific coast

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