Serum thyroxine,estradiol-17β, and testosterone profiles during the parr-smolt transformation of masu salmon,Oncorhynchus masou |
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| Authors: | Hideaki Yamada Hiromi Ohta Kohei Yamauchi |
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| Institution: | (1) Department of Biology, Faculty of Fisheries, Hokkaido University, Hakodate, Hokkaido 041, Japan;(2) Hokkaido Fish Hatchery, Eniwa, Hokkaido 061-14, Japan;(3) Department of Biology, Faculty of Fisheries, Hokkaido University, Hakodate 041, Japan |
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| Abstract: | Changes in serum thyroxine (T4), estradiol-17β (E2) and testosterone (T) levels during the parr-smolt transformation (smoltification) were investigated in the masu salmon (Oncorhynchus masou) in 1985 and 1987. T4 showed a peak in levels at the early stage of smoltification and E2 and T levels peaked almost at the same time. There were no significant differences between the concentrations of serum hormones
in female and males. During smoltification, germ cells in the peri-nucleolus and spermatogonia stage were present in the ovary
and testis, respectively. These results suggest that E2 and T may be involved in smoltification in the masu salmon. |
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| Keywords: | masu salmon smoltification serum thyroxine estradiol-17β testosterone |
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