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6 Dirección General Adjunta de Investigación Pesquera en el Atlántico Instituto Nacional de Pesca y Acuacultura Secretaría de Agricultura y Desarrollo Rural, Avenida Mexico 190 Colonia del Carmen 04100 Coyoacán, Mexico City, Mexico. Abstract—The fishery for Pacific hake (Merluccius productus) was established in the northern Gulf of California (NGC) in Mexico in 2000. To describe relevant features of the fishery and bio­ logy of Pacific hake, we analyzed 5 years of data from an on board observers pro­ gram. Using generalized additive mod­ els, we standardized catch per unit of effort (CPUE), mean standard length (SL), and sex ratio. Also, we investigated by year the joint effect of maturity stage and sex on size distribution, biometric relationships, and the effect of maturity stage (juvenile or adult) on sex ratio. For all characteristics, significant inter­ annual variability was observed. An average decrease was observed both in CPUE (52%) and mean SL (7%) during January–March. Adult males were more abundant in catch, with a male­ to­ female ratio of 1.12:1.00 (P<0.05), and adult females were larger than males (F=807.09, P<0.05). Our results support the previously suggested hypothesis that the NGC is the winter spawning ground for Pacific hake in the region. Further research is needed to deter­ mine the status of the stock in the NGC and to outline specific potential man­ agement strategies.

Catch rate, length, and sex ratio of Pacific hake (Merluccius productus) in the northern Gulf of California