Population parameters of the snail astraea undosa (wood, 1828) from the west coast of the baja california peninsula

Growth and mortality of the snail Astraea undosa were estimated based on the age determination of 1034 opercula obtained from 34,969 organisms sampled in five fishing areas off the west coast of Baja California Sur (Mexico), during 1997 and 1998. No significant differences were detected in the sizes...

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Autores principales:	Gluyas-Millán, MG, Quiñónez-Velázquez, C, Talavares-Maya, J
Formato:	Online
Lenguaje:	eng
Publicado:	Iniversidad Autónoma de Baja California 2000
Acceso en línea:	https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/610
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spelling	oai:cienciasmarinas.com.mx:article-6102019-05-03T19:18:08Z Population parameters of the snail astraea undosa (wood, 1828) from the west coast of the baja california peninsula Parámetros poblacionales del caracol Astraea undosa (Wood, 1828) en la costa occidental de la península de Baja California Gluyas-Millán, MG Quiñónez-Velázquez, C Talavares-Maya, J Astraea undosa age growth mortality peninsula of Baja California Astraea undosa edad crecimiento mortalidad península de Baja California Growth and mortality of the snail Astraea undosa were estimated based on the age determination of 1034 opercula obtained from 34,969 organisms sampled in five fishing areas off the west coast of Baja California Sur (Mexico), during 1997 and 1998. No significant differences were detected in the sizes of each sex and age groups of 0 to 12 years were determined. To describe the growth pattern, the von Bertalanffy growth model was fitted to size-age data per fishing area and the following growthparameters were obtained: L∞= 167.8 to 175.1 mm basal diameter, K = 0.08 to 0.10 mm/year and t0 = –1.7 to –1.2 years. The growth pattern was similar among areas in agreement with the performance index, φ′. However, a north-south size-age latitudinal gradient was observed; the largest sizes per age were observed at Isla Natividad. The natural mortality was 0.29 per year. The total mortality rate per area varied from 0.43 to 0.90 per year and the exploitation rate from 0.11 to 0.40 per year. The results indicate that the fishery sustains appropriate exploitation levels. Se estimó el crecimiento y la mortalidad del caracol Astraea undosa a partir de la determinación de edad en 1034 opérculos obtenidos de 34,969 individuos muestreados en cinco zonas de pesca en la costa occidental de Baja California Sur (México), durante 1997 y 1998. No se detectaron diferencias significativas en tallas por sexo y se determinaron grupos de edad de 0 a 12 años. Se ajustó el modelo de crecimiento de von Bertalanffy a los datos de edad-talla por zona de pesca y los valores de los parámetros variaron entre 167.8 y 175.1 mm de diámetro basal para L∞, entre 0.08 y 0.10 mm/año para K y entre –1.7 y –1.2 años para t0. El patrón de crecimiento fue similar entre zonas de acuerdo con el valor del parámetro φ′. No obstante, se observó un gradiente latitudinal de norte a sur de la talla a la edad; las tallas mayores por edad se observaron en los caracoles de Isla Natividad. La mortalidad natural fue de 0.29 por año para el área de estudio, la tasa de mortalidad total por zona varió entre 0.43 y 0.90 por año y la tasa de explotación entre 0.11 y 0.40 por año. Esto último indica que la pesquería sostiene niveles de aprovechamiento adecuados. Iniversidad Autónoma de Baja California 2000-03-06 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article Artículo Arbitrado application/pdf https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/610 10.7773/cm.v26i4.610 Ciencias Marinas; Vol. 26 No. 4 (2000); 643-658 Ciencias Marinas; Vol. 26 Núm. 4 (2000); 643-658 2395-9053 0185-3880 eng https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/610/547
institution	Ciencias Marinas
collection	OJS
language	eng
format	Online
author	Gluyas-Millán, MG Quiñónez-Velázquez, C Talavares-Maya, J
spellingShingle	Gluyas-Millán, MG Quiñónez-Velázquez, C Talavares-Maya, J Population parameters of the snail astraea undosa (wood, 1828) from the west coast of the baja california peninsula
author_facet	Gluyas-Millán, MG Quiñónez-Velázquez, C Talavares-Maya, J
author_sort	Gluyas-Millán, MG
title	Population parameters of the snail astraea undosa (wood, 1828) from the west coast of the baja california peninsula
title_short	Population parameters of the snail astraea undosa (wood, 1828) from the west coast of the baja california peninsula
title_full	Population parameters of the snail astraea undosa (wood, 1828) from the west coast of the baja california peninsula
title_fullStr	Population parameters of the snail astraea undosa (wood, 1828) from the west coast of the baja california peninsula
title_full_unstemmed	Population parameters of the snail astraea undosa (wood, 1828) from the west coast of the baja california peninsula
title_sort	population parameters of the snail astraea undosa (wood, 1828) from the west coast of the baja california peninsula
description	Growth and mortality of the snail Astraea undosa were estimated based on the age determination of 1034 opercula obtained from 34,969 organisms sampled in five fishing areas off the west coast of Baja California Sur (Mexico), during 1997 and 1998. No significant differences were detected in the sizes of each sex and age groups of 0 to 12 years were determined. To describe the growth pattern, the von Bertalanffy growth model was fitted to size-age data per fishing area and the following growthparameters were obtained: L∞= 167.8 to 175.1 mm basal diameter, K = 0.08 to 0.10 mm/year and t0 = –1.7 to –1.2 years. The growth pattern was similar among areas in agreement with the performance index, φ′. However, a north-south size-age latitudinal gradient was observed; the largest sizes per age were observed at Isla Natividad. The natural mortality was 0.29 per year. The total mortality rate per area varied from 0.43 to 0.90 per year and the exploitation rate from 0.11 to 0.40 per year. The results indicate that the fishery sustains appropriate exploitation levels.
publisher	Iniversidad Autónoma de Baja California
publishDate	2000
url	https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/610
_version_	1715723989506064384

Population parameters of the snail astraea undosa (wood, 1828) from the west coast of the baja california peninsula

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