4/30/2023 0 Comments Figa fotonica![]() ![]() occidental was sampled, their is and 2474 of P. Study areas sampled during the period 1990-1991 in the lower part of Golfo de Nicoya. For practical reasons, the analysis consid ered all the outward zones integralIy, mainly because this zone is open to the fishing activity during year-round. The mesh size at the cod end was 37.5 mm. MATERIAL AND METHODS Monthly length composition data from sam pIes of shrimps were caught on board of com mercial trawler vessel during the period 19901991, in the lower part of the Golfo de Nicoya (Fig. The aim of this paper is to contribute to the biological and fishery infor mation pool, estimating maturation patteros of the two species, growth parameters, mortality, probability of capture, recruitment and yield and biomass per recruitment in the lower part of the Golfo de Nicoya. At present, the main problems in the Golfo de Nicoya fishery are heavy fishing effort, poor economic benefit, few biological and fishery information and extravagant power consump tion, which will eventually produce the fluctua tions in the population. 1993), showing at least two peaks, probably three per year (Angulo 1993). occidentalis appears to be more or less continuously present (Alfaro et al. Considering the spawning as the base of the resource renewal mechanism and stock conser vation, in the lower Golfo de Nicoya, spawners of P. had important consequences to the outcome of specific management mea sures (Garcia 1977a, Garcia & Le Reste 1981). catchability, fishing mortality, age structure of the exploited population, reproductive poten tial, biomass, etc. In the study of these stocks, the patteros of seasonal recruitment, growth, behavior and. An intensive fisheries exist in the two areas, but few biological data are available for these two species (Carranza 1985, Vítola 1985, and Palacios et al. The Gulf is divided in two areas, the inner part where � fishery c10se season is applied and the lower part where do not exist management restraints. stylirostris sup port valuable fisheries in the Golfo de Nicoya. In Costa Rica populations of two species of shrimp, P. The limiting factor in shrimp stock assessment and management, at present, does not appear to be a shortage of methodologies, at least for single species, but rather the scarce knowledge of the mechanisms of shrimp pro duction and fleet dynarnics (Garcia 1985). Scientific work on population dynamics and stock assessment has greatly developed in Latin A!llerica, West Africa, South East Asia, Persian Gulf and eastero Indian Ocean (Garcia 1985). Coastal penaeid shrimp stocks have become more intensively s,t udied in the tropics. The analysis of Y/R and B/R showed an overexploited penaeid stock with a very low renewal rateo Key words: Shrimp, assessment, growth, mortality, recruitment, maturation, fishery dynamics, Penaeus. High values of total mortality and exploitation rate were obtained, which indicate that these stocks are overexploited. Results showed that this stock is similar to the one studied in the inner part, as for their maturation and growth parameters. stylirostris in the lower Golfo de Nicoya (Puntarenas, Costa Rica) was undertaken using a length frequency analysis. ![]() Abstract: Analysis on the maturation rate, growth, mortality, selection pattems, recruitment and yield (YIR) and bio mass (BIR) per recruitment of P. Escuela de Ciencias Biológicas, Area de Ecología y Manejo de Recursos Costeros, Universidad Nacional, P.O.B. Stock as�essment of two penaeid prawn species, Penaeus occidentalis and Penaeus stylirostris (Decapoda: Penaeidae), in Golfo de Nicoya, Costa Rica Farid A Tabash B.
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