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 found in this river, we suggest that there is a great possibility that the occurrence of intersex tilapia was caused by these chemicals. The above finding suggests that greater attention needs to be given to endocrine disrupting chemicals problems.
Sun, P. L. in, & Tsai, S. S. (2009). Intersex tilapia (Oreochromis spp.) from a contaminated river in Taiwan: A case study. Toxins, 1(1), 14–24. https://doi.org/10.3390/toxins1010014