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In the present study, JajroudRiverloach, Oxynoemacheilus bergianus (Derjavin, 1934), was examined monthly for a previous observation of oocyte presence within testes tissues. Accordingly, the gonad development in O. bergianus is examined histologically. Although our data show typical fish gonad development and differentiation in female and some male individuals, some males sho...

The expression of the yolk protein vitellogenin (Vtg) has been used as a biomarker of feminisation in multiple fish species throughout the world. Since the late 1990s, researchers have attempted to develop similar biomarkers to address whether reproductive endocrine disruption also occurs in the males of invertebrate groups such as the Crustacea. To date, the vast majority of studies investigat...

River pollution in Taiwan is rather serious, but so far there have been no reports of fish intersex problems. This report reveals that 50% male tilapia in the Era-Jiin River of southern Taiwan were found to be feminized in an October 8, 1994 collection from station EJ-2 of this river. After discounting all other possible causative factors, and correlating with endocrine disrupting chemicals fou...