Abundance of hake larvae and its relationship to hake and anchoveta biomasses of Peru
1989
Sandoval De Castillo, O. | Wosnitza-Mendo, C. | Muck, P. | Carrasco, S. (Instituto del Mar del Peru, Callao (Peru))
An analysis of 43 maps of hake larvae (Merluccius gayi) distribution off the Peruvian coasts, from survey areas between 30 deg 30' and 18 deg S 1966 to 1987, was performed and an index of larval abundance was calculated. This index plotted against anchoveta biomass, showed an inverse relationship, suggesting a negative impact of anchoveta on hake eggs and larvae and on the distribution area of the hake larvae. The latter increased two-to-four fold in the period of low anchoveta biomass from 1972 to 1983. The hake larvae abundance index plotted against spawning stock biomass showed the expected positive relationship. The seasonal and interyear changes of the distribution of both larvae and adult stocks are discussed with reference to abiotic and biotic factors.
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