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In this paper we present data of monthly shrimp catches by species composition and size from Puerto Peñasco, Sonora, Mexico, for the 1967-1968 season. We also analyse fishing effort and its effect. The total catch and numbers of individuals captured.of Penaeus stylirostris climaxed in September and October; the total catch and numbers of individuals captured of P. californiensis were greates from November to December. Maximum growth of P. stylirostris ocurred from May to November and cesased durin< the winter and early spring months. Maximum growth of P. californiensis was from May throgh December, slowing greatly from 3anuary to March. The average growth from September through April was 1.82 g/month for p. stylirostris and 1.07 g/month for P. californiensis. Also, the former species greatly exceeded Fhe latter specEs in model size due to its enhanced summer growth rate. Both species exhibited a single prominent breeding season in the spring and a lesser breeding period in the fall. Patterns of size distribution indicate that most individuals of both species live year or less, under the conditions of sustained fishing presure. Overfishing is evidente for both species.

SHRIMP POPULATION DYNAMICS AND FISHERY IMPACT IN THE NORTHERN GULF OF CALIFORNIA. 1967-1968.