On the ecology of two sympatric flounders of the genus Paralichthys in the Bay of Coquimbo, Chile

The ecology of two flounders belonging to the genus Paralichthys was studied in the Bay of Coquimbo (29°57′S), Chile. P. adspersus grows larger than P. microps. In both species, the females were significantly larger than the males. The species differed in their reproductive cycles as revealed by their gonadosomatic indices. This difference was also reflected in larval abundance and spatial distribution of the species. No significant changes were found in the abundances of juveniles and adults in the Bay of Coquimbo either throughout the year or interannually. However, when the analysis included the proportion of specimens between the two species and sex by season, the differences were apparent in most cases. The results show that the environmental characteristics of the marine system which the Bay of Coquimbo is a part of provide good feeding, spawning and nursery grounds for these two species of flounder.