Abstract
Sailfin mollies, Poecilia latipinna, inhabit both fresh and brackish waters throughout their native range. In laboratory analyses, following extensive acclimation, individuals taken from freshwater populations tolerated a range of ambient salinities from fresh water through 70%o (parts per thousand), whereas individuals from brackish water tolerated salinities ranging from fresh water through 80%0o. Plasma osmotic concentrations of the two groups were not significantly different at common ambient salinities over the range from fresh water through 75%0o. Isolation in nature of populations in fresh and brackish waters has not greatly altered their physiological capabilities with respect to ambient salinity.
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