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J.Health Sci., 46(5), 376-379, 2000
The Occurrence of Dual-gender Imposex in Japanese Freshwater Crab
Tohru Takahashi,*, a Akira Araki,b Yuji Nomura,c Minoru Koga,a and Koji Arizonoa
aFaculty of Environmental and Symbiotic Sciences, Prefectural University of Kumamoto, 3-1-100 Tsukide, Kumamoto 862-8502, Japan,
bDepartment of Applied Aquabiology, National Fisheries University, Nagatahon-machi, Shimonoseki, Yamaguchi 759-6595, Japan, and
cDepartment of Biomaterials Science, Faculty of Dentistry, Hiroshima University, 1-2-3 Kasumi, Minami-ku, Hiroshima 734-8553, Japan
Tributylin (TBT)-induced imposex phenomena have been reported only in mollusks. Our findings reveal that imposex is not a phenomenon exclusive to mollusks. The imposex phenomenon has been found to occur in a common Japanese freshwater crab,
Geothelphusa dehaani, which inhabits TBT-uncontaminated mountain streams in Japan. In addition,
the imposex of G. dehaani occurred not only in females but also in males (dual-gender imposex): either female genital opening (gonopore) or a single ovary occurred in male crabs. However, the definitive causal factors and mechanics relating to the occurrence of imposex are still unclear.
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