Abstract

In several species of Pleuronectiformes have been cases of ocular reversal, a phenomenon in which the individual lies at the bottom on the opposite side than usual and / or normal. The rate at which this condition occurs is variable and depends on the species analyzed. In the genus Paralichthys reversal has been reported in four species: P. albigutta, P. orbignyanus, P. californicus y P. dentatus. This paper reports a case of reversal in Paralichthys adspersus (Steindachner, 1867) caught in Caldera (Chile). On the other hand is reported for this species reversed individuals from a crop, from broodstock who were captured in Bahia Coquimbo. In right and left specimens from a crop, a comparison was made of morphometric relationships. The proportion of fish with ocular reversal coming from a culture, accounting 2.2% of the population fishes produced. We discuss the frequency of such anomalies and the probable causes that would produce