Thus, increased aromatase activity is not necessary for sex inversion, and alternatively, aromatase-independent pathways for sex reversal
resulting from xenobiotic treatment must exist.
phenomena in bivalves and its mechanism.
However, estrogen treatment during embryonic development can produce gonadal sex reversal
in genetic males (Gallien 1953).
The locality in Wyoming (North Platte River) with the highest frequency of sex reversal
(92% of the males) is not in the vicinity of farms, nor is it in a county that reports significant atrazine use.
was determined by comparing fish color (genetic sex) to the phenotypic sex as determined by inspection of the gonad.
in rainbow trout creating an all-female.
Nonylphenol induced ovotestes in males exposed to approximately 25 ppb and induced sex reversal
in fish exposed to 50 ppb for 3 months posthatch (69).
Medaka are widely used in environmental toxicological assays and were the first teleost in which sex reversal
was obtained by exposure to sex steroids (26,27).
This study was initiated to determine the incidence of phenotypic sex reversal
in wild, fall chinook salmon (Oncorhynchus tshawytcha) that returned to spawn in the Columbia River.
We also examined the rate of gonadal sex reversal
caused by various concentrations of [E.
effects of environmentally relevant pesticide concentrations on the red-eared slider turtle, a species with temperature-dependent sex determination.