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The paper explores the effects of an environmental estrogen on male gulf pipefish, Syngnathus scovelli, a male brooding teleost. Gulf pipefish were collected with seines in Meaher Park, Baldwin County, Alabama. The effects of 17α-ethinylestradiol (EE2), a synthetic estrogen analog, on non-brooding male pipefish were examined in laboratory based experiment. EE2 was chosen as a model for environmental estrogen because of its relative stability. Exposure to EE2 had significant effects on non-brooding male gulf pipefish. Hepatosomatic index values for EE2-exposed males were significantly higher than those for control fish. The results parallel what has been seen for non sex-role reversed fish exposed to xenoestrogen or other contaminants.