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Lack of genotoxicity in Astyanax bimaculatus and Oreochromis niloticus of 17α-methyltestosterone used in fish hatcheries to produce male monosex populations

Author(s): C.L.G. Rivero-Wendt1, A.L. Miranda-Vilela1, M.F.N. Ferreira1, F.S. Amorim2, V.A.G. da Silva2, H. Louvandini3 and C.K. Grisolia1

17α-Methyltestosterone (MT) is widely used in fish hatcheries of many countries to produce male monosex populations. Its genotoxic risk to fish species is not well known and studies in other in vivo models are still inconclusive. MT was tested for genotoxicity in the fish species Oreochromis niloticus (tilapia), a target species, and Astyanax bimaculatus (lambari), a native non-target species.