Thus, increased aromatase activity is not necessary for sex inversion, and alternatively, aromatase-independent pathways for
sex reversal resulting from xenobiotic treatment must exist.
Sex reversal 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.
Sex reversal was determined by comparing fish color (genetic sex) to the phenotypic sex as determined by inspection of the gonad.
Sex reversal 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.
Sex reversal effects of environmentally relevant pesticide concentrations on the red-eared slider turtle, a species with temperature-dependent sex determination.
