Population parameters of the trigonal tivela Tivela mactroides (Bivalvia: Veneridae) from Caicara Beach, Anzoátegui, Venezuela

Aspects of population dynamics of the trigonal tivela Tivela mactroides, an important fisheries resource, were studied from October 2002 to September 2003 at Caicara Beach, Anzoátegui, Venezuela. The substratum consists mainly of fine-grained sand (100–250 µm; 80.33%). The mean density of the clam o...

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Main Authors:	Arrieche, D, Prieto, A
Format:	info:eu-repo/semantics/article
Language:	eng
Published:	Iniversidad Autónoma de Baja California 2006
Subjects:	Tivela mactroides densidad biomasa índice de condición crecimiento allometric relationship biomass condition index growth
Online Access:	https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/1061
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id	repositorioinstitucional-20.500.12930-7400
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spelling	repositorioinstitucional-20.500.12930-74002023-05-09T14:30:30Z Population parameters of the trigonal tivela Tivela mactroides (Bivalvia: Veneridae) from Caicara Beach, Anzoátegui, Venezuela Parámetros poblacionales del guacuco Tivela mactroides (Bivalvia: Veneridae) de Playa Caicara, Estado Anzoátegui, Venezuela Arrieche, D Prieto, A Tivela mactroides densidad biomasa índice de condición crecimiento Tivela mactroides allometric relationship biomass condition index growth Aspects of population dynamics of the trigonal tivela Tivela mactroides, an important fisheries resource, were studied from October 2002 to September 2003 at Caicara Beach, Anzoátegui, Venezuela. The substratum consists mainly of fine-grained sand (100–250 µm; 80.33%). The mean density of the clam on the shoreline was 53.83 ind m–2, but there were significant monthly differences. The population structure was bimodal, with a dominant group from October 2002 showing a high growth rate. Maximum population biomass was recorded in March 2003 (25.12 ± 4.44 gDW m–2) and minimum in July 2003 (2.37 ± 0.41 gDW m–2). The condition index was maximum in July 2003 (26.26 ± 4.64%) and minimum in March 2003 (16.48 ± 13.23%), with a monthly mean of 17.55 ± 3.02%. The mean dry tissue yield was 23.58 ± 5.05%. The growth parameters estimated, L∞ = 44.32 mm and K = 0.165 month–1, indicate an average longevity of 18 months. The strong monthly decline in density and biomass, with adult mortality of 0.20 month–1, reveals that the population is seriously affected by human extraction, and we therefore recommend reducing the intensity of exploitation. Se evaluaron aspectos de la biología y dinámica poblacional de una población del bivalvo Tivela mactroides, un importante recurso pesquero de Venezuela. Los ejemplares se recolectaron desde octubre de 2002 hasta septiembre de 2003 en Playa Caicara, estado Anzoátegui, sobre la línea de mareas, siendo el substrato de grano fino (100–250 µm; 80.33%). La densidad presentó oscilaciones con un promedio de 53.83 ind m–2 con diferencias mensuales significativas. La estructura de la población fue bimodal con una cohorte dominante desde octubre de 2002 que presentó una alta tasa de crecimiento. La máxima biomasa individual se obtuvo en marzo de 2003 (25.12 ± 4.44 gPs m–2) y la mínima en julio del mismo año (2.37 ± 0.41 gPs m–2) con un promedio de 14.19 ± 6.59 gPs m–2. El índice de condición fue máximo en julio de 2003 (26.26 ± 4.64%) y mínimo en marzo del mismo año (16.48 ± 13.23%), con un promedio mensual de 17.55 ± 3.02%, mientras que el rendimiento medio del tejido seco fue de 23.8 ± 5.05%. Los parámetros de crecimiento estimados de la longitud asintótica L∞ = 44.32 mm y K = 0.165 mes–1 señalan que la población presentó una longevidad aproximada de 18 meses. La fuerte disminución mensual de la biomasa y de la densidad poblacional con una tasa de mortalidad de 0.20 mes–1, indican que la población está en declinación por lo que se recomienda disminuir los niveles de explotación. 2006-06-23 2021-06-03T03:55:10Z 2021-06-03T03:55:10Z info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article Artículo Arbitrado https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/1061 10.7773/cm.v32i21.1061 https://hdl.handle.net/20.500.12930/7400 eng https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/1061/945 application/pdf Iniversidad Autónoma de Baja California Ciencias Marinas; Vol. 32 No. 2 (2006); 285-296 Ciencias Marinas; Vol. 32 Núm. 2 (2006); 285-296 2395-9053 0185-3880
institution	Repositorio Institucional
collection	DSpace
language	eng
topic	Tivela mactroides densidad biomasa índice de condición crecimiento Tivela mactroides allometric relationship biomass condition index growth
spellingShingle	Tivela mactroides densidad biomasa índice de condición crecimiento Tivela mactroides allometric relationship biomass condition index growth Arrieche, D Prieto, A Population parameters of the trigonal tivela Tivela mactroides (Bivalvia: Veneridae) from Caicara Beach, Anzoátegui, Venezuela
description	Aspects of population dynamics of the trigonal tivela Tivela mactroides, an important fisheries resource, were studied from October 2002 to September 2003 at Caicara Beach, Anzoátegui, Venezuela. The substratum consists mainly of fine-grained sand (100–250 µm; 80.33%). The mean density of the clam on the shoreline was 53.83 ind m–2, but there were significant monthly differences. The population structure was bimodal, with a dominant group from October 2002 showing a high growth rate. Maximum population biomass was recorded in March 2003 (25.12 ± 4.44 gDW m–2) and minimum in July 2003 (2.37 ± 0.41 gDW m–2). The condition index was maximum in July 2003 (26.26 ± 4.64%) and minimum in March 2003 (16.48 ± 13.23%), with a monthly mean of 17.55 ± 3.02%. The mean dry tissue yield was 23.58 ± 5.05%. The growth parameters estimated, L∞ = 44.32 mm and K = 0.165 month–1, indicate an average longevity of 18 months. The strong monthly decline in density and biomass, with adult mortality of 0.20 month–1, reveals that the population is seriously affected by human extraction, and we therefore recommend reducing the intensity of exploitation.
format	info:eu-repo/semantics/article
author	Arrieche, D Prieto, A
author_facet	Arrieche, D Prieto, A
author_sort	Arrieche, D
title	Population parameters of the trigonal tivela Tivela mactroides (Bivalvia: Veneridae) from Caicara Beach, Anzoátegui, Venezuela
title_short	Population parameters of the trigonal tivela Tivela mactroides (Bivalvia: Veneridae) from Caicara Beach, Anzoátegui, Venezuela
title_full	Population parameters of the trigonal tivela Tivela mactroides (Bivalvia: Veneridae) from Caicara Beach, Anzoátegui, Venezuela
title_fullStr	Population parameters of the trigonal tivela Tivela mactroides (Bivalvia: Veneridae) from Caicara Beach, Anzoátegui, Venezuela
title_full_unstemmed	Population parameters of the trigonal tivela Tivela mactroides (Bivalvia: Veneridae) from Caicara Beach, Anzoátegui, Venezuela
title_sort	population parameters of the trigonal tivela tivela mactroides (bivalvia: veneridae) from caicara beach, anzoátegui, venezuela
publisher	Iniversidad Autónoma de Baja California
publishDate	2006
url	https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/1061
_version_	1792609119670108160

Population parameters of the trigonal tivela Tivela mactroides (Bivalvia: Veneridae) from Caicara Beach, Anzoátegui, Venezuela

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