Distribution patterns of the demersal fish assemblage off central Chile.

Abstract

Thespatial and temporal distribution of the fish fauna in the fishing area of Pleuroncodes monodon, off Central Chile, is analysed. Haul-by-haul information from four surveys was taken into account (April 1982 and 1983, and March and November 1984). The demersal fish fauna exhibits two boundaries, one at depths of around 250 ± 50 m and the other one at depths of around 100 m. Consequently, three fish assemblages are recognized: inshore over the continental shelf, offshore over the continental shelf, and over the upper continental slope. Temporal and spatial changes in the fish assemblage are clearly recognized with M. gayi as the dominant species, being replaced in depth mainly by the grenadier fish Coelorinchus aconcagua.