TY - JOUR
T1 - The effects of methyltestosterone on the sexual development and reproduction of adult medaka (Oryzias latipes)
AU - Kang, Ik Joon
AU - Yokota, Hirofumi
AU - Oshima, Yuji
AU - Tsuruda, Yukinari
AU - Shimasaki, Yohei
AU - Honjo, Tsuneo
N1 - Funding Information:
This work was funded by a grant from Ministry of the Environment, Japan.
PY - 2008/4/8
Y1 - 2008/4/8
N2 - We examined the effects of methyltestosterone (MT) on the reproduction of medaka (Oryzias latipes). Six mating pairs of medaka were exposed for 3 weeks to MT at the measured concentrations of 22.5, 46.8, 88.1, 188, and 380 ng/L. The fecundity and fertility of paired medaka were significantly decreased in the 46.8, 88.1, 188, and 380 ng/L MT groups compared with those of controls. The gonadosomatic indices of female fish exposed to ≥46.8 ng/L were increased significantly. Gonadal histology showed degeneration of oocytes in the ovaries of fish in all MT treatment groups. Hepatic vitellogenin concentrations were significantly decreased in female fish treated with MT at 188 and 380 ng/L, and the hatchability and survival rate of the offspring were decreased in all MT treatment groups. These results clearly demonstrate that MT at ≥46.8 ng/L inhibited gonadal development and adversely affected the reproduction of medaka.
AB - We examined the effects of methyltestosterone (MT) on the reproduction of medaka (Oryzias latipes). Six mating pairs of medaka were exposed for 3 weeks to MT at the measured concentrations of 22.5, 46.8, 88.1, 188, and 380 ng/L. The fecundity and fertility of paired medaka were significantly decreased in the 46.8, 88.1, 188, and 380 ng/L MT groups compared with those of controls. The gonadosomatic indices of female fish exposed to ≥46.8 ng/L were increased significantly. Gonadal histology showed degeneration of oocytes in the ovaries of fish in all MT treatment groups. Hepatic vitellogenin concentrations were significantly decreased in female fish treated with MT at 188 and 380 ng/L, and the hatchability and survival rate of the offspring were decreased in all MT treatment groups. These results clearly demonstrate that MT at ≥46.8 ng/L inhibited gonadal development and adversely affected the reproduction of medaka.
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U2 - 10.1016/j.aquatox.2008.01.010
DO - 10.1016/j.aquatox.2008.01.010
M3 - Article
C2 - 18313154
AN - SCOPUS:40849083254
SN - 0166-445X
VL - 87
SP - 37
EP - 46
JO - Aquatic Toxicology
JF - Aquatic Toxicology
IS - 1
ER -