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KMID : 0613820040140010072
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Journal of Life Science
2004 Volume.14 No. 1 p.72 ~ p.81
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Effects of TBTCl on the Behavior and Reproduction of the Guppy (Poecilia reticulata)
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Yoon Myung-Hee
Oh Ji-Hyun
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Abstract
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Sexually matured guppies (Poecilia reticulata) were exposed to TBTCl (0.1, 0.32, 1, 3.2, 10, 25, 32, 50, 75 and 100 μg/l) for 144 hours to determine the bioaccumulation rate and effects on the reproduction and behavior. The ratio of TBT residues to ∑BTs (TBT:∑BTs) was 67% or higher in all the guppies exposed to TBTCl, and the higher the level of TBTCl exposed, the higher the ratio of TBT:∑BTs, suggesting that the higher the level of TBTCl exposed, the lower the metabolism rate of the fish. TBTCl exposure led to a poor reproductivity and an abnormal sexual behavior in the fish, i.e. a reduced number of the male sexual sigmoid display and of spermatophore in the efferent duct was observed in the fish exposed to 0.1 μg/l and higher levels of TBTCl, and a decreasing ratio of the testicular spermatophore cyst to the whole germ cell cysts was observed in the fish exposed to 0.32～10 μg/l of TBTCl. The reduced ratio of the spermatophore cyst seems to be an effect of the endocrine disruptor inhibiting spermiogenesis. In the fish exposed to 25 μg/l and higher levels of TBTCl, more serious effects, such as a rapid increase of mortality, the necrosis of most of the germ cells, great damages in Sertoli cells and epithelial cells of the efferent duct, a significant increase of abnormal swimming behavior, and a cessation of feeding were observed, which suggest the acute toxicity of TBTCl inhibiting not only the reproduction and behavior but also the survival of the fish itself.
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KEYWORD
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guppy, TBTCI, reproduction, sexual behavior, bioaccumulation rate
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