Sexual Differences in Homing Profiles and Shortening of Homing Duration by Gonadotropin-Releasing Hormone Analog Implantation in Lacustrine Sockeye Salmon (Oncorhynchus nerka) in Lake Shikotsu

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概要

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• Adult sockeye salmon (Oncorhynchus nerka) in Lake Shikotsu were captured in September, October and November adjacent to their natal hatchery prior to spawning. They were sampled for hormones, tagged and released in the center of lake. Fish were again sampled at recapture to characterize changes in steroid hormone levels in individual migrants as well as homing percentage and duration in each month. All males returned faster than females early in the breeding season, although a half of the tagged males did not return to the natal site late in the season (November). A high percentage of females always returned, and homing duration shortened late in the season. In males, the shortening of homing duration coincided with an increase in serum testosterone (T) and 11-ketotestosterone levels. In females, the shortening of homing duration corresponded to an elevation of serum T and 17α,20β-dihydroxy-4-pregnen-3-one (DHP) levels, and a drop in serum estradiol-17β levels. Sustained administration of gonadotropin-releasing hormone analog (GnRHa, via implants) in September greatly shortened homing duration, especially in females. GnRHa treatment caused a dramatic increase in serum DHP levels in both sexes on average. Individual GnRHa-treated males which rapidly returned, however, showed higher serum T levels and lower serum DHP levels than slower returning males. The present study indicates sexual differences in homing profiles as well as shortening of homing duration following GnRHa implantation in lacustrine sockeye salmon in Lake Shikotsu which may be reflective of changes in serum steroid hormone levels.

• 社団法人日本動物学会の論文

著者

• Urano Akihisa

  Division Of Biological Sciences Graduate School Of Science Hokkaido University

• YAMAUCHI Kohei

  Graduate School of Fisheries Sciences, Hokkaido University

• Yamauchi K

  Hokkaido Univ. Hokkaido Jpn

• Fukuwaka Masa-aki

  Hokkaido National Fisheries Research Institute

• Sato Ayako

  Toya Lake Station For Environmental Biology Faculty Of Fisheries Hokkaido University

• Yamauchi Kohei

  Department Of Biology Faculty Of Fisheries Hokkaido University

• Kaeriyama Masahide

  Hokkaido Tokai University

• UEDA Hiroshi

  Toya Lake Station for Environmental Biology, Faculty of Fisheries, Hokkaido University

• FUKAYA Masahiro

  Toya Lake Station for Environmental Biology, Faculty of Fisheries, Hokkaido University

• ZOHAR Yonathan

  Center of Marine Biotechnology, University of Maryland Biotechnology Institute

• Kaeriyama Masahide

  Research Division, National Salmon Hatchery, Fisheries Agency of Japan

• Urano Akihisa

  Field Science Center For Northern Biosphere Hokkaido University

• Urano Akihisa

  Division Of Biological Science Graduate School Of Life Science Hokkaido University

• Ueda H

  Teikyo Univ. Kanagawa Jpn

• Ueda H

  Field Sci. Ctr. Hokkaido Univ.

• Zohar Yonathan

  Center Of Marine Biotechnology University Of Maryland Biotechnology Institute

• Fukaya M

  Central Research Institute Mitsukan Group Corporation

• Kaeriyama M

  Hokkaido Tokai Univ. Sapporo

• Ueda H

  Usa Marine Biological Institute Kochi University

• Ueda Hiroshi

  Toya Lake Station For Environmental Biology Faculty Of Fisheries Hokkaido University

• Yamauchi Kohei

  Department of Biological Science, Faculty of Science, Shizuoka University

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