Gonadotropin-Releasing Hormone Analog and Sex Steroids Shorten Homing Duration of Sockeye Salmon in Lake Shikotsu
スポンサーリンク
概要
- 論文の詳細を見る
Gonadotropin-releasing hormone analog (GnRHa), testosterone (T) or 17α, 20β-dihydroxy-4pregnen-3-one (DHP) was implanted in lacustrine sockeye salmon (Oncorhynchus nerka) to examine their effects on homing behavior prior to spawning. Maturing adult fish in Lake Shikotsu were captured by a set net adjacent to their natal hatchery in September and October, 1997. They were tagged, implanted with hormones and released at the center of lake. More than 70% of released fish returned to the hatchery. In September, GnRHa-implanted fish returned significantly earlier than the controls regardless of sexes. DHP also shortened homing duration in the females but not in the males. T tended to reduce homing duration in the males, however it did not have any significant effect in the females. In October, fish in all groups quickly returned within a few days after the release. Hence, the shortening effect of GnRHa on homing duration was not seen. The October fish may be already well primed by endogenous hormones. The present study showed that, in September, GnRHa consistently shortened homing duration, whereas sex steroid actions varied depending on sex in lacustrine sockeye salmon.
- 社団法人日本動物学会の論文
- 1998-10-15
著者
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Urano Akihisa
Division Of Biological Sciences Graduate School Of Science Hokkaido University
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Kitahashi Takashi
Division of Biological Sciences, Graduate School of Science, Hokkaido University
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YAMAUCHI Kohei
Graduate School of Fisheries Sciences, Hokkaido University
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Yamauchi K
Hokkaido Univ. Hokkaido Jpn
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Sato Ayako
Toya Lake Station For Environmental Biology Faculty Of Fisheries Hokkaido University
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Ueda H
Field Science Center For Northern Biosphere Hokkaido University
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Kaeriyama Masahide
Hokkaido Tokai University
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UEDA Hiroshi
Toya Lake Station for Environmental Biology, Faculty of Fisheries, Hokkaido University
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KAERIYAMA Masahide
National Salmon Resources Center, Fisheries Agency of Japan
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ZOHAR Yonathan
Center of Marine Biotechnology, University of Maryland Biotechnology Institute
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Urano Akihisa
Field Science Center For Northern Biosphere Hokkaido University
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Urano Akihisa
Division Of Biological Science Graduate School Of Life Science Hokkaido University
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Ueda H
Field Sci. Ctr. Hokkaido Univ.
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Alok Deoraj
Center of Marine Biotechnology, University of Maryland, Biotechnology Institute
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Yamauchi Kohei
Depertment of Biology, Faculty of Fisheries, Hokkaido University
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Ueda Hiroshi
Department Of Dermatology Fujita Health University School Of Medicine
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Alok Deoraj
Center Of Marine Biotechnology University Of Maryland Biotechnology Institute
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Zohar Yonathan
Center Of Marine Biotechnology University Of Maryland Biotechnology Institute
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Kaeriyama M
Hokkaido Tokai Univ. Sapporo
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Kitahashi Takashi
Section Of Biological Sciences Graduate School Of Life Science Hokkaido University
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Kitahashi Takashi
Division Of Biological Sciences Graduate School Of Science Hokkaido University
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Ueda H
Usa Marine Biological Institute Kochi University
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Kitahashi T
Brain-operative Expression Laboratory Brain Science Institute
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Ueda Hiroshi
Toya Lake Station For Environmental Biology Faculty Of Fisheries Hokkaido University
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