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Investigaciones marinas

versión On-line ISSN 0717-7178


PEREZ, Eduardo P.. A simple model for describing the biomass dynamics of the nylon shrimp Heterocarpus reedi at Coquimbo, Chile. Investig. mar. [online]. 2005, vol.33, n.2, pp.131-142. ISSN 0717-7178.

A daily record of space/time dynamics was carried out on CPUE (ton·trawl-1) for the nylon shrimp trawl fishery based at Coquimbo, Chile, between September 1997 and August 2000. A modified biomass depletion model was constructed to analyze the temporal variations in CPUE based on the concepts of abundance (total population biomass) and availability (potential biomass capture). Both quantities were calculated by equations whose differences (positive and negative) indicated the changes in availability of biomass over time, as well as recruitmernt (magnitude and seasonality). The modified model suggested there were two periods annually, of different lengths, and different biomasses available with the fishing gear. The model also indicated a more rapid rate of reduction in biomass than did the CPUE. The results could influence the determination of the best season for carrying out direct resource evaluations aimed at determining catch quotas

Palabras clave : Heterocarpus reedi; shrimp fishery; fisheries assessment; CPUE; abundance; biomass; catch quotas; model; Chile.

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