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Volume 36- Number 1 - 2001
Article


Fishing power, efficiency and selection of gillnets for the shortfin grunt (Microlepidotus brevipinnis Steindachner, 1869), in the southern coast of Jalisco, Mexico

Jorge A. Rojo-Vázquez1,3, Francisco Arreguín-Sánchez2 & Enrique Godínez-Domínguez1

 

(1) Centro de Ecología Costera, Departamento de Ecología y Recursos Naturales, Universidad de Guadalajara, Gómez Farias 82, San Patricio-Melaque, Jalisco. México 48980
(2) Centro Interdisciplinario de Ciencias Marinas del Instituto Politécnico Nacional, Apartado Postal 592, 23000, La Paz, Baja California Sur, México
(3) Dirección actual: Centro de Investigación Científica y de Educación Superior de Ensenada, B.C, Km 107 Carretera Tijuana-Ensenada. Apdo. Postal 2732. Ensenada, B. C. México

 

E-mail: jrojo@cicese.mx

 

Gillnet selectivity, fishing power and catch efficiency for Microlepidotus brevipinnis (Steindachner, 1869) off Bahia de Navidad, Jalisco, Mexico, were estimated. Field experiments were conducted using gillnets of 7.62 and 8.89 cm of mesh-size, during April 1994 to March 1995. A total of 457 organisms were caught with the 7.62 cm mesh-size, and 592 with the 8.89 mesh-size. Results shows gillnet of 8.89 cm mesh size caught 3 cm larger organisms and 110 g more weighted fish than those caught by the 7.62 mesh-size. The 7.62 mesh-size caught 1.9 times organisms and 1.3 more weight than the 7.62 cm mesh-size. Selectivity analysis indicates an optimum length (100% probability of retention) was 27.7 cm TL for the 7.62 mesh-size and 32.3 cm TL for the 8.89 cm mesh-size. The relative efficiency analysis was estimated as relative catchability ratio between nets and it varied in a range of 25% to 39% with fish length.

 

Key words: gillnet, selectivity, fish power, catchability, Jalisco, Mexico

 

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1Laboratorio de Zooplancton, Instituto de Ciencias del Mar y Limnología,Universidad Nacional Autónoma de México. A. P. 70-305, 04510 México, D. F. México
 
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