Growth models fitted to Dipturus chilensis length-at-age-data support a two phase growth

Age and growth for the beaked skate was estimated from bands in the vertebral centra of 689 individuals obtained from incidental catches of the Argentine hake (Merluccius hubbsi) fishery. Age bias plots and indices of precision indicated that ageing method was precise and unbiased (% CV = 3 % PA = 8...

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Autores principales:	AVERSA,MARINA I, DANS,SILVANA L, GARCÍA,NÉSTOR A, CRESPO,ENRIQUE A
Lenguaje:	English
Publicado:	Sociedad de Biología de Chile 2011
Materias:	beaked skate Dipturus chilensis growth two-phase growth
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2011000100003
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spelling	oai:scielo:S0716-078X20110001000032011-06-24Growth models fitted to Dipturus chilensis length-at-age-data support a two phase growthAVERSA,MARINA IDANS,SILVANA LGARCÍA,NÉSTOR ACRESPO,ENRIQUE A beaked skate Dipturus chilensis growth two-phase growth Age and growth for the beaked skate was estimated from bands in the vertebral centra of 689 individuals obtained from incidental catches of the Argentine hake (Merluccius hubbsi) fishery. Age bias plots and indices of precision indicated that ageing method was precise and unbiased (% CV = 3 % PA = 82.09 %). Edge and marginal increment analysis of the vertebrae support the hypothesis of annual band pair deposition. Three growth models were fitted to length-at-age and the two-phase growth model produced the best fit. This feature has never been described before for D. chilensis and can be related to changes in energy allocation and the shift from juvenile to adult phase. The unrealistic biological estimates of the von Bertalanffy growth model illustrates the importance of fitting alternative models to the data. Female beaked skates reached greater size in length (L∝) as well as in disc width (L∝ = 138.2 cm; DW∝ = 92.46 cm) and have lower growth rate (k = 0.08 yr-1) than males (L∝ = 106.7 cm; DW∝ = 74.52 cm; k = 0.121 yr-1). This study provides basic information on age and growth for the beaked skate, D. chilensis, which were previously not available for its south Atlantic range of distribution.info:eu-repo/semantics/openAccessSociedad de Biología de ChileRevista chilena de historia natural v.84 n.1 20112011-03-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2011000100003en10.4067/S0716-078X2011000100003
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	beaked skate Dipturus chilensis growth two-phase growth
spellingShingle	beaked skate Dipturus chilensis growth two-phase growth AVERSA,MARINA I DANS,SILVANA L GARCÍA,NÉSTOR A CRESPO,ENRIQUE A Growth models fitted to Dipturus chilensis length-at-age-data support a two phase growth
description	Age and growth for the beaked skate was estimated from bands in the vertebral centra of 689 individuals obtained from incidental catches of the Argentine hake (Merluccius hubbsi) fishery. Age bias plots and indices of precision indicated that ageing method was precise and unbiased (% CV = 3 % PA = 82.09 %). Edge and marginal increment analysis of the vertebrae support the hypothesis of annual band pair deposition. Three growth models were fitted to length-at-age and the two-phase growth model produced the best fit. This feature has never been described before for D. chilensis and can be related to changes in energy allocation and the shift from juvenile to adult phase. The unrealistic biological estimates of the von Bertalanffy growth model illustrates the importance of fitting alternative models to the data. Female beaked skates reached greater size in length (L∝) as well as in disc width (L∝ = 138.2 cm; DW∝ = 92.46 cm) and have lower growth rate (k = 0.08 yr-1) than males (L∝ = 106.7 cm; DW∝ = 74.52 cm; k = 0.121 yr-1). This study provides basic information on age and growth for the beaked skate, D. chilensis, which were previously not available for its south Atlantic range of distribution.
author	AVERSA,MARINA I DANS,SILVANA L GARCÍA,NÉSTOR A CRESPO,ENRIQUE A
author_facet	AVERSA,MARINA I DANS,SILVANA L GARCÍA,NÉSTOR A CRESPO,ENRIQUE A
author_sort	AVERSA,MARINA I
title	Growth models fitted to Dipturus chilensis length-at-age-data support a two phase growth
title_short	Growth models fitted to Dipturus chilensis length-at-age-data support a two phase growth
title_full	Growth models fitted to Dipturus chilensis length-at-age-data support a two phase growth
title_fullStr	Growth models fitted to Dipturus chilensis length-at-age-data support a two phase growth
title_full_unstemmed	Growth models fitted to Dipturus chilensis length-at-age-data support a two phase growth
title_sort	growth models fitted to dipturus chilensis length-at-age-data support a two phase growth
publisher	Sociedad de Biología de Chile
publishDate	2011
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2011000100003
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Growth models fitted to Dipturus chilensis length-at-age-data support a two phase growth

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