Journal
AQUATIC TOXICOLOGY
Volume 85, Issue 4, Pages 291-296Publisher
ELSEVIER
DOI: 10.1016/j.aquatox.2007.09.012
Keywords
methyl testosterone; marbled crayfish; toxicity; teratogenicity; ovarian development; sex differentiation
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Testosterone is regularly found in the tissues of decapod crustaceans. Although this vertebrate-type sex hormone is not the principal factor of sex differentiation in crustaceans, it was shown to be capable of acting on the reproductive organs of shrimps and crabs. In the present study I have exposed developing eggs and stage 5 juveniles of the parthenogenetic all female marbled crayfish to 17 alpha-methyl testosterone in order to test whether in freshwater crayfish sex can be changed from female to male by this androgen. NIT did not elicit sex change, neither when administered during embryonic development nor during juvenile stage 5, the main period of proliferation of the oocytes. However, exposure to 100 mu g/L MT from 64% to 84% embryonic development resulted in prolonged embryonic development, reduced hatching success, reduced growth of the juveniles, and severe malformations of the appendages in the juveniles. The marbled crayfish is recommended to be considered for toxicity tests due to its easy culture in the laboratory and its genotypical uniformity. (c) 2007 Elsevier B.V. All rights reserved.
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