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Volume 44 - Number 1 - 2009
Article

 

Fishing by hooks in longliners from the Mexican Pacific Ocean: effects in the catch rate and weight of sharks and other species

 

Ildefonso Galeana-Villaseñor1, Felipe Galván-Magaña2 y Heriberto Santana-Hernández3

 

1Instituto Tecnológico de Mazatlán. Corsario 1 No.203. Col. Urías. Mazatlán, SinaloaMéxico. C.P. 82070

2Centro Interdisciplinario de Ciencias Marinas. Av. IPN s/n. Apdo. Postal 592. La Paz, México. C.P. 23000

3Centro Regional de Investigación Pesquera. Playa Ventana S/N. Apdo. Postal 591 Manzanillo, Col. México. C.P. 28200

 

E-mail: galvan.felipe@gmail.com

 

We analyzed the effects of two hook types and two bait types on the catch rate of long liners from the northwest Pacific Ocean off Mexico. In 47 sets, from four commercial fishing trips done during March 2005 to August 2006, we used conventional J-style 9/0 11º offset hooks and experimental circle 16/0 0º offset hooks. We used two bait types: jumbo squid (Dosidicus gigas) and striped mullet juveniles (Mugil cephalus). A factorial experiment split-plot design was applied. A total of 1304 organisms were caught, where 86.5% were sharks, and blue shark (Prionace glauca) was the dominant specie and 13.5% from other species. While the hook type did not affect significantly the catch rate and weight of sharks and other species, the bait type had a significant effect, mainly on the catch rate of blue shark, silky shark (Carcharhinus falciformis), dolphinfish (Coryphaena hippurus), and the weight of total catch. The Tukey test showed that the mean catch rate of blue shark, silky shark, dolphinfish, total catch and weight were higher for squid bait than for striped mullet

 

Key words: By-catch, blue shark, Eastern Pacific Ocean

 

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