Abstract

SALVATTECI, Renato  and  MENDO, Jaime. Estimation of bio-economic losses caused by the capture of juvenile anchovy ( Engraulis ringens, J. ) in the peruvian coast. Ecol. apl. [online]. 2005, vol.4, n.1-2, pp.113-120. ISSN 1726-2216.

During many years the landings of the pelagic fishery off the Peruvian coast have been characterized by a high percentage of juvenile individuals, especially in the case of the anchovy ( Engraulis ringens ) during the year 2002 whose impacts are not well-known and studied. In this work we analyzed the biomass and economic loss due to the fishing of juveniles based on projections of the size composition of the landings in Paita, Chimbote, Callao and Pisco. The biomass projections were carried out by means of the Thompson and Bell model using the von Bertalanffy growth parameters estimated with the program ELEFAN I for each landing site and the natural mortality rate provided by the Peruvian Marine Institute (IMARPE ) . The biomasses were projected until the <12cm fraction of individuals presented a percentage lesser than 10 % . The economic losses were estimated by subtracting the value of landing from the value of the projected biomass. Conversion coefficients were estimated using available data of the fish meal industry and international prices for fish meal and oil were used in order to estimate fish meal and oil production and value. The results show that when projecting the real landings the biomasses increase by: 13.3 % in Paita, 17.7 % in Chimbote, 9.3 % in Callao and 7.6 % in Pisco and the value of the processed biomasses by 31.8 % in Paita, 40.9 % in Chimbote, 25.9 % in Callao and 21.2 % in Pisco. In relation to landing value and biomass projected for the year 2002 a difference of 91.8 million dollars was obtained. We discuss the impact of this fishing strategy on the population dynamics and some management measures are suggested to increase the biological and economic yield of this species.

Keywords : anchoveta; Engraulis ringens; size composition; landing; predictive model; fish meal and oil.

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