Age and growth of the swordfish (Xiphias gladius Linnaeus, 1758) in the southeastern Pacific off Chile (2001)

The age and growth of swordfish (Xiphias gladius) in the southeastern Pacific off Chile were estimated for 511 males and 632 females using samples collected from longline fisheries in 2001. Lower jaw fork length (LJFL) measurements ranged from 100 to 265 cm for males and 116 to 289 cm for females. A...

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Autor principal:	Cerna,José F
Lenguaje:	English
Publicado:	Pontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del Mar 2009
Materias:	age growth swordfish Xiphias gladius Chile southeastern Pacific
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2009000100005
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spelling	oai:scielo:S0718-560X20090001000052009-04-22Age and growth of the swordfish (Xiphias gladius Linnaeus, 1758) in the southeastern Pacific off Chile (2001)Cerna,José F age growth swordfish Xiphias gladius Chile southeastern Pacific The age and growth of swordfish (Xiphias gladius) in the southeastern Pacific off Chile were estimated for 511 males and 632 females using samples collected from longline fisheries in 2001. Lower jaw fork length (LJFL) measurements ranged from 100 to 265 cm for males and 116 to 289 cm for females. Age estimates were obtained using cross sections of the second anal fin ray. Both the monthly average marginal increment and the analysis of the edge type indicated periodicity in the formation of growth bands, with the hyaline band forming in the summer (December-March). The relationship between the ray radius and LJFL was nonlinear. The growth was modeled using standard and generalized Von Bertalanffy equations. Swordfish growth was best described by the standard equation, with the foliowing parameters: L∞ = 279 cm, K = 0.158, t0 = -2.65 for males, and L∞ = 321 cm, K = 0.133, t0 = -2.46 for females. The analysis of growth curves revealed that females are significantly larger than males. A comparison of growth rates between differ-ent studies shows that swordfish in the southeastern Pacific off Chile grow faster than those from the north-western Pacific (Taiwan), southwestem Pacific (Australia), and other regions (Atlantic Ocean, Mediterranean Sea), but their growth rates are very similar to those of the swordfish from the central North Pacific (Hawaii).info:eu-repo/semantics/openAccessPontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del MarLatin american journal of aquatic research v.37 n.1 20092009-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2009000100005en
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	age growth swordfish Xiphias gladius Chile southeastern Pacific
spellingShingle	age growth swordfish Xiphias gladius Chile southeastern Pacific Cerna,José F Age and growth of the swordfish (Xiphias gladius Linnaeus, 1758) in the southeastern Pacific off Chile (2001)
description	The age and growth of swordfish (Xiphias gladius) in the southeastern Pacific off Chile were estimated for 511 males and 632 females using samples collected from longline fisheries in 2001. Lower jaw fork length (LJFL) measurements ranged from 100 to 265 cm for males and 116 to 289 cm for females. Age estimates were obtained using cross sections of the second anal fin ray. Both the monthly average marginal increment and the analysis of the edge type indicated periodicity in the formation of growth bands, with the hyaline band forming in the summer (December-March). The relationship between the ray radius and LJFL was nonlinear. The growth was modeled using standard and generalized Von Bertalanffy equations. Swordfish growth was best described by the standard equation, with the foliowing parameters: L∞ = 279 cm, K = 0.158, t0 = -2.65 for males, and L∞ = 321 cm, K = 0.133, t0 = -2.46 for females. The analysis of growth curves revealed that females are significantly larger than males. A comparison of growth rates between differ-ent studies shows that swordfish in the southeastern Pacific off Chile grow faster than those from the north-western Pacific (Taiwan), southwestem Pacific (Australia), and other regions (Atlantic Ocean, Mediterranean Sea), but their growth rates are very similar to those of the swordfish from the central North Pacific (Hawaii).
author	Cerna,José F
author_facet	Cerna,José F
author_sort	Cerna,José F
title	Age and growth of the swordfish (Xiphias gladius Linnaeus, 1758) in the southeastern Pacific off Chile (2001)
title_short	Age and growth of the swordfish (Xiphias gladius Linnaeus, 1758) in the southeastern Pacific off Chile (2001)
title_full	Age and growth of the swordfish (Xiphias gladius Linnaeus, 1758) in the southeastern Pacific off Chile (2001)
title_fullStr	Age and growth of the swordfish (Xiphias gladius Linnaeus, 1758) in the southeastern Pacific off Chile (2001)
title_full_unstemmed	Age and growth of the swordfish (Xiphias gladius Linnaeus, 1758) in the southeastern Pacific off Chile (2001)
title_sort	age and growth of the swordfish (xiphias gladius linnaeus, 1758) in the southeastern pacific off chile (2001)
publisher	Pontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del Mar
publishDate	2009
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2009000100005
work_keys_str_mv	AT cernajosef ageandgrowthoftheswordfishxiphiasgladiuslinnaeus1758inthesoutheasternpacificoffchile2001
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Age and growth of the swordfish (Xiphias gladius Linnaeus, 1758) in the southeastern Pacific off Chile (2001)

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