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Volume 43 - Number 1 - 2008
Artículo


Influence of hook type and fishing depth on longline catches of sharks and other pelagic species in the northwest Mexican Pacific

Ildefonso Galeana-Villaseñor1, Felipe Galván-Magaña2 y Roberto Gómez-Aguilar3

 

1Instituto Tecnológico de Mazatlán. Corsario 1 No.203. Col. Urías. Mazatlán, Sinaloa,México. C.P. 82070
2Centro Interdisciplinario de Ciencias Marinas. Av. IPN s/n. Apdo. Postal 592. La Paz, México. C.P. 23000
3Universidad Autónoma de Nayarit. Unidad Académica de Agricultura. Carretera Tepic-Compostela Km 9, Jalisco. Nayarit, México. C.P. 63780

 

E-mail: galvan.felipe@gmail.com

 

An experiment using longlines to evaluate the effects of hook type and depth of longline on the catches of sharks and other pelagic species was carried out close to Mazatlan, Mexico. We compared the J-style hooks, tuna hook, tuna 18° offset hook, and circle hook at three depth strata: S1 (0-55 m), S2 (55-85 m) y S3 (85-99 m). From the total capture, the circle hook had significantly higher catch rate than J-style hook and tuna hook. The main species caught with circle hook were blue marlin (Makaira nigricans) and striped marlin (Tetrapturus audax). The highest biomass of blue shark (Prionace glauca), blue marlin, sailfish (Istiophorus platypterus) and striped marlin was found in the shallow stratum (0-55 m) than in the deep stratum (85-99 m). By hook type, the higher capture of blue marlin was with circle hook and tuna hook at shallow depths (0-55 m).

 

Key words: Tiburones, pelágicos mayores, Golfo de California

 

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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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