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Latin american journal of aquatic research

On-line version ISSN 0718-560X

Abstract

FLORES, Héctor  and  MARTINEZ, Paula. Ocular reversal in Paralichthys adspersus (Steindachner, 1867) small eyes flounder (Pleuronectiformes, Paralichthyidae): a case from the environment and analysis of cultured specimens. Lat. Am. J. Aquat. Res. [online]. 2013, vol.41, n.1, pp.57-67. ISSN 0718-560X.  http://dx.doi.org/103856/vol41-issue1-fulltext-4.

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.

Keywords : eye-migration; ocular abnormalities; early development; aquaculture; Coquimbo; Chile.

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