Ovotestis in a Japanese Medaka

Autor: Wade Getsfrid, Octavia Conerly, William R. Hartley, Arunthavarani Thiyagarajah
Rok vydání: 2004
Předmět:
Zdroj: Journal of Aquatic Animal Health. 16:164-168
ISSN: 1548-8667
0899-7659
DOI: 10.1577/h03-037.1
Popis: We observed ovotestis in Japanese medaka Oryzias latipes used to study the effects of bromodichloromethane (BDCM) on gonadal differentiation. Bromodichloromethane, a trihalomethane, is a drinking water disinfection byproduct. Seven-day-old Japanese medaka (n = 30 fish per treatment) were exposed for 10 d to nominal concentrations of BDCM (10 or 25 mg/L) in dimethyl sulfoxide, a carrier solvent control, or a springwater control, then transferred to springwater and reared for 6 months. Ovotestis was present in one female of the 13 Japanese medaka that survived for 6 months after exposure to 10 mg/L BDCM. This is the first report of an intersex condition in a BDCM exposure study. There are no known reports of spontaneous occurrences of ovotestis in Japanese medaka; however, we cannot eliminate the possibility that this single case was spontaneous rather than induced by BDCM. Therefore, further studies with a wide range of concentrations of BDCM are needed to confirm the ovotestis induction potential...
Databáze: OpenAIRE
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