Age and growth of the blue shark, Prionace glauca Linnaeus, 1758, in the Northwest coast off Mexico

The blue shark is one of the main species caught in the artisanal fisheries in the northwest coast of Mexico. The age and growth was estimated by counting the growth bands on vertebral centra stained with silver nitrate from 204 sharks. Shark sizes ranged from 81 to 270 cm total length (TL), with a...

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Autores principales:	Blanco-Parra,María del Pilar, Galván-Magaña,Felipe, Márquez-Farías,Fernando
Lenguaje:	English
Publicado:	Universidad de Valparaíso. Facultad de Ciencias del Mar 2008
Materias:	Fisheries Baja California Sur growth bands silver nitrate vertebrae
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-19572008000300010
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spelling	oai:scielo:S0718-195720080003000102009-04-09Age and growth of the blue shark, Prionace glauca Linnaeus, 1758, in the Northwest coast off MexicoBlanco-Parra,María del PilarGalván-Magaña,FelipeMárquez-Farías,Fernando Fisheries Baja California Sur growth bands silver nitrate vertebrae The blue shark is one of the main species caught in the artisanal fisheries in the northwest coast of Mexico. The age and growth was estimated by counting the growth bands on vertebral centra stained with silver nitrate from 204 sharks. Shark sizes ranged from 81 to 270 cm total length (TL), with a mean of 165 ± 35 cm and a sex ratio of 2:1 between males and females. Male lengths ranged from 81 to 270 cm TL (mean 150.4 ± 32.3 cm, n=593) and female lengths ranged from 90 to 252 cm TL (mean 162.7 ± 37.5 cm, n=324). The relationship between TL and the vertebral centrum radio (CR) was linear indicating a positive relationship between the vertebral centrum growth and body growth. IAPE estimated value was 3.0%. Maximum age estimated for males was 16 years and for females, 12 years. The majority of the sharks in the catches were juveniles of age four (134 ± 13 cm TL) and age seven (174 ± 21 cm TL) from which 19% were males and 22% were females. The von Bertalanffy growth parameters were: L∞ = 299.85 cm TL, K = 0.10 years-1 and t0 = -2.44 years for males and L∞ = 237.5 cm TL, K = 0.15 years-1 and t0 = -2.15 years for females; differences in growth were found between sexes. Growth parameters were within the range of previous values reported for blue sharks in the Pacific Ocean.info:eu-repo/semantics/openAccessUniversidad de Valparaíso. Facultad de Ciencias del MarRevista de biología marina y oceanografía v.43 n.3 20082008-12-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-19572008000300010en10.4067/S0718-19572008000300010
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Fisheries Baja California Sur growth bands silver nitrate vertebrae
spellingShingle	Fisheries Baja California Sur growth bands silver nitrate vertebrae Blanco-Parra,María del Pilar Galván-Magaña,Felipe Márquez-Farías,Fernando Age and growth of the blue shark, Prionace glauca Linnaeus, 1758, in the Northwest coast off Mexico
description	The blue shark is one of the main species caught in the artisanal fisheries in the northwest coast of Mexico. The age and growth was estimated by counting the growth bands on vertebral centra stained with silver nitrate from 204 sharks. Shark sizes ranged from 81 to 270 cm total length (TL), with a mean of 165 ± 35 cm and a sex ratio of 2:1 between males and females. Male lengths ranged from 81 to 270 cm TL (mean 150.4 ± 32.3 cm, n=593) and female lengths ranged from 90 to 252 cm TL (mean 162.7 ± 37.5 cm, n=324). The relationship between TL and the vertebral centrum radio (CR) was linear indicating a positive relationship between the vertebral centrum growth and body growth. IAPE estimated value was 3.0%. Maximum age estimated for males was 16 years and for females, 12 years. The majority of the sharks in the catches were juveniles of age four (134 ± 13 cm TL) and age seven (174 ± 21 cm TL) from which 19% were males and 22% were females. The von Bertalanffy growth parameters were: L∞ = 299.85 cm TL, K = 0.10 years-1 and t0 = -2.44 years for males and L∞ = 237.5 cm TL, K = 0.15 years-1 and t0 = -2.15 years for females; differences in growth were found between sexes. Growth parameters were within the range of previous values reported for blue sharks in the Pacific Ocean.
author	Blanco-Parra,María del Pilar Galván-Magaña,Felipe Márquez-Farías,Fernando
author_facet	Blanco-Parra,María del Pilar Galván-Magaña,Felipe Márquez-Farías,Fernando
author_sort	Blanco-Parra,María del Pilar
title	Age and growth of the blue shark, Prionace glauca Linnaeus, 1758, in the Northwest coast off Mexico
title_short	Age and growth of the blue shark, Prionace glauca Linnaeus, 1758, in the Northwest coast off Mexico
title_full	Age and growth of the blue shark, Prionace glauca Linnaeus, 1758, in the Northwest coast off Mexico
title_fullStr	Age and growth of the blue shark, Prionace glauca Linnaeus, 1758, in the Northwest coast off Mexico
title_full_unstemmed	Age and growth of the blue shark, Prionace glauca Linnaeus, 1758, in the Northwest coast off Mexico
title_sort	age and growth of the blue shark, prionace glauca linnaeus, 1758, in the northwest coast off mexico
publisher	Universidad de Valparaíso. Facultad de Ciencias del Mar
publishDate	2008
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-19572008000300010
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Age and growth of the blue shark, Prionace glauca Linnaeus, 1758, in the Northwest coast off Mexico

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