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Seasonal shift in the taxonomic diversity of rocky reef fishes in the southwestern Gulf of California

Spatial distribution, density and population structure of the Cortes geoduck, Panopea globosain the Central Gulf of California

Authors

CORRESPONDING

E. Alberto Aragón-Noriega

aaragon04@cibnor.mx

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Centro de Investigaciones Biológicas del Noroeste, Unidad Sonora, Km 2.35 Camino al Tular, Estero Bacochibampo, Guaymas, Sonora 85454, México

Luis E. Calderon-Aguilera

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Centro de Investigación Científica y de Educación Superior de Ensenada. Carretera Ensenada-Tijuana 3918, Ensenada, Baja California 22860, México

Edgar Alcántara-Razo

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Centro de Investigaciones Biológicas del Noroeste, Unidad Sonora, Km 2.35 Camino al Tular, Estero Bacochibampo, Guaymas, Sonora 85454, México

Jaime E. Mendivil-Mendoza

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Centro de Investigaciones Biológicas del Noroeste, Unidad Sonora, Km 2.35 Camino al Tular, Estero Bacochibampo, Guaymas, Sonora 85454, México

Abstract

The geoduck clam Panopea globosa is a commercially important species because of its high market demand, particularly in Asia. The aim of this study was to analyze the effect of chlorophyll concentration, sea surface temperature, turbidity, and tidal cycle on density estimation, spatial distribution, and population structure of P. globosa in the central Gulf of California using remote sensing and field survey data. Specimen collections were conducted through semiautonomous diving from November 2009 to January 2011. A total of 10,114 clams were obtained with an average weight of  997 ± 212 g (80% ³ 800 g), and an average length of 132 ± 12.5 mm (80% of all collected clams exceeded 130 mm, the minimum legal fishing size). P. globosa distribution displayed significant differences among the 3 patches of high density in the study area, but density was poorly correlated with the environmental factors.

Key words

Fishery, management, Gulf of California, geoduck

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