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JNAFS

21

J. Fernando Márquez-Farias1

Instituto Nacional de la Pesca, Centro Regional de Investigación Pesquera de Guaymas SAGARPA
Calle 20 Sur No. 605, Col. Cantera, CP 85400, Guaymas, Sonora, Mexico

 

Publication (Upload) date: 21 March 2005

 

MÁRQUEZ-FARIAS, J. F. 2005. Gillnet Mesh Selectivity for the Shovelnose Guitarfish (Rhinobatos productus) from Fishery-Dependent Data in the Artisanal Ray Fishery of the Gulf of California, Mexico. J. Northw. Atl. Fish. Sci., 35: 443-452. doi:10.2960/J.v35.m505

 

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Abstract

The Gulf of California supports the largest ray fishery in Mexico. Sonora is a major ray-fishing state, reporting 56% (live weight) of the Pacific Ocean rays production. Bottom-set gillnets are the principal fishing gear deployed in this artisanal fishery. In the absence of long-term monitoring and complex biological data for fishery stock assessment, an understanding of the selectivity properties of gillnets can provide a basis for implementation of a standard mesh-size as regulation tool for fishery management. Ideally, gillnet selectivity parameters are determined from fishing trials with several gillnets of a range of mesh-sizes constructed and used in a way to control for factors likely to affect the fishing power nets. In the absence of such experimental data, the present study uses available fishery-dependent monitoring data standardized to construct a data set that meets as near as possible the conditions met in a controlled experiment. A likelihood-based method was used to estimate the selectivity parameters for the shovelnose guitarfish (Rhinobatos productus) caught in the Gulf of California. The values of the selectivity parameters were θ1 = 105.7 and θ2 = 21 741 for 3.5, 5, 6, 8, and 8.5 inch mesh sizes.

Key words: artisanal fisheries, elasmobranchs, gear selectivity, gillnet, rays, regulation

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Citation: MÁRQUEZ-FARIAS, J. F. 2005. Gillnet Mesh Selectivity for the Shovelnose Guitarfish (Rhinobatos productus) from Fishery-Dependent Data in the Artisanal Ray Fishery of the Gulf of California, Mexico. J. Northw. Atl. Fish. Sci., 35: 443-452. doi:10.2960/J.v35.m505
Posted in: Volume 35 - 2005
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