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Volume 37- Number 1 - 2002
Article


Individual growth and population abundance relationship in the Pacific sardine Sardinopsc caeruleus (Pisces: Clupeidae) (Girard 1856) From Isla de Cedros, Baja California, Mexico

Casimiro Quiñonez-Velázquez, Reyna Alvarado-Castillo & Roberto Félix-Uraga

 

Centro Interdisciplinario de Ciencias Marinas I.P.N., Playa El Conchalito s/n Apdo. Postal 592, La Paz, Baja California Sur, C.P. 23000, México

 

E-mail: cquinone@ipn.mx

 

The effect of the population abundance on the individual growth during the pre-recruit stage of the Pacific sardine from Island de Cedros, Baja California, Mexico was analyzed. The population size was estimated using virtual population analysis and the fish length at age was backcalculate using otolith radius-standard length relationship. During the Pacific sardine first year of life, the results showed a selective mortality by length and a dependent growth of the population abundance. The partially recruited fish (<2 years old) to the fishery showed larger backcalculate length during their first year old than fully recruited fish (>2 years old). The 1980 year class grew more during your first year of life than later year classes (1981-1983); and the differences were significantly associated with the population abundance.

 

Key words: Pacific sardine, age, otolith, backcalculate length


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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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