Seasonal Variations in Plasma Concentrations of Sex Steroid Hormones and Vitellogenin in Wild Male Japanese Dace(Tribolodon hakonensis) Collected from Different Sites of the Jinzu River Basin(Endocrinology)
スポンサーリンク
概要
- 論文の詳細を見る
In order to clarify the seasonal variations of plasma sex steroid hormones and vitellogenin (VTG) concentrations in the wild male Japanese dace, Tribolodon hakonensis, we measured plasma levels of testosterone (T), 11-ketotestosterone (11-KT), estradiol-17β (E_2) and VTG, as well as spermatogenetic stages and gonadosomatic index (GSI). Wild Japanese dace were collected from different sites of the Jinzu River basin (including the Takahara River and the Itachi River). The fish from Toyama Bay were also measured the spermatogenetic stages, GSI and VTG levels. The seasonal variations of the hormone levels were discussed in the relationship with various environmental factors. In landlocked fish of the Takahara River, the plasma concentrations of T and E_2 reached the highest levels in May and June. In the fish collected from the Itachi River, plasma concentrations of T, 11-KT and E_2 reached the highest levels during breeding season of April and May. Sexual maturation, evaluating from GSI and the spermatogenetic stages, proceeded earlier in the fish population at Toyama Bay, and afterward it was followed in the fish population at the Takahara River, in associated with a rise of environmental water temperature at fish captured sites. In the male dace, low but detectable levels of plasma E_2 were measured and there were significantly positive correlations between E_2 level and the levels of GSI, VTG or T. These results suggest that E_2 might be a necessary sex steroid hormone related to gonad maturation, and that circulating E_2 may induce VTG production in the wild male Japanese dace.
- 社団法人日本動物学会の論文
- 2005-08-25
著者
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MATSUDA KOUHEI
Department of Brology, Faculty of Science, Toyama University
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UCHIYAMA MINORU
Department of Oral Physiology
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Matsuda Kouhei
Department Of Biology Faculty Of Science Toyama Univercity
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Uchiyama Minoru
Department Of Biology Faculty Of Science Toyama Univercity
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Ma Ying-Xin
Graduate School of Science and Engineering, Toyama University
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Ma Ying-xin
Graduate School Of Science And Engineering Toyama University
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Matsuda Kouhei
Univ. Toyama Toyama Jpn
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