Ocular reversal in Paralichthys adspersus (Steindachner, 1867) small eyes flounder (Pleuronectiformes, Paralichthyidae): a case from the environment and analysis of cultured specimens

Héctor Flores, Paula Martínez


DOI: https://doi.org/10.3856/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. 

Flores H, Martínez P. 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.. 2017;41(1): 57-67. Available from: doi:10.3856/vol41-issue1-fulltext-4 [Accessed 14 Nov. 2019].
Flores, H., & Martínez, P. (2017). Ocular reversal in Paralichthys adspersus (Steindachner, 1867) small eyes flounder (Pleuronectiformes, Paralichthyidae): a case from the environment and analysis of cultured specimens. Latin American Journal of Aquatic Research, 41(1), 57-67. doi:http://dx.doi.org/10.3856/vol41-issue1-fulltext-4