Estandarización de tasas de captura de pesquerías pelágicas de la zona norte de Chile durante 1987-92

Abstract

We used a general linear model for the standarization of the index of relative abundance catch per unit of effort (CPUE). The analysis was performed for anchovy (Engraulis ringens) and sardine (Sardinops sagax) in northern Chile (18°21'-24°S), for the years 1987 through 1992. For anchovy we have considered ship hold capacity, fishing area, season, year and the sea surface temperature (SST). For sardine, we have considered ship's hold capacity, fishing area, season and year. These variables individually have a significant effect in the CPUE logarithms. For the anchovy, we identified a significant interaction between year*season, year*fishing area, season*fishing area, fishing area*SST, season*year*fishing area, season*year*SST, season*fishing area*SST, and year*fishing area*SST. In the case of the sardine the significant interactions identified were season*year, season*fishing area, and season*year*fishing area. In conclusion, approximately 35% to 45% of the total variation observed for the log of CPUE was not explained by the models. This is should be explained by the aleatory nature of the fishery.