Acceleration of Gonadal Maturation in Anadromous Maturing Sockeye Salmon by Gonadotropin-Releasing Hormone Analog Implantation

• Fukaya Masahiro

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

• Ueda Hiroshi

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

• Sato Ayako

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

• Kaeriyama Masahide

  National Salmon Resources Center, Fisheries Agency of Japan Department of Marine Sciences and Technology, School of Engineering, Hokkaido Tokai University

• Ando Hironori

  Division of Biological Sciences, Graduate School of Science, Hokkaido University

• Zohar Yonathan

  Center of Marine Biotechnology, University of Maryland Biotechnology Institute

• Urano Akihisa

  Division of Biological Sciences, Graduate School of Science, Hokkaido University

• Yamauchi Kohei

  Department of Biology, Faculty of Fisheries, Hokkaido University

抄録

The effects of a three week intramuscular implantation of gonadotropin-releasing hormone analog (GnRHa) on gonadal maturation and changes in serum gonadal steroid hormone levels were examined in anadromous, maturing sockeye salmon Oncorhynchus nerka during the pre-spawning season. Spermiation occurred in both GnRHa-implanted and control males, but serum 17α, 20β-dihydroxy-4-pregnen-3-one (DHP) levels in the implanted males were higher than in controls. No differences were found in serum testosterone (T) levels between GnRHa-implanted and control males. Serum 11-ketotestosterone (11KT) levels in control males increased for three weeks, but those in GnRHa-implanted males did not change. All GnRHa-implanted females ovulated completely for three weeks, while 25% of control females ovulated partially and the rest of females ovulated 17-24 days after sampling. The number of ovulated eggs of GnRHa-implanted females was greater than that of control females, and percentages of eyed eggs were not different between GnRHa-implanted and control females. Serum levels of DHP increased dramatically in GnRHa-implanted females, but those of T and estradiol-17β (E₂) was similar to control females. These results confirm that GnRHa accelerates gonadal maturation of both sexes through elevation of serum DHP levels in maturing sockeye salmon.

収録刊行物

• Ｆｉｓｈｅｒｉｅｓ　ｓｃｉｅｎｃｅ

  Ｆｉｓｈｅｒｉｅｓ　ｓｃｉｅｎｃｅ 64 (6), 948-951, 1998

  公益社団法人 日本水産学会

キーワード

• Gonadotropin-releasing hormone analog
• gonadal maturation
• 17α, 20β-dihydroxy-4-pregnen-3-one
• anadromous sockeye salmon

詳細情報

• CRID: 1390001204428522240
• NII論文ID: 130003903271
• NII論文ID: 10004876977
• NII書誌ID: AA10993718
• DOI: 10.2331/fishsci.64.948
• COI: 1:CAS:528:DyaK1MXjs1yktw%3D%3D
• NDL書誌ID: 107166
• ISSN: 09199268
• ISSN: http://id.crossref.org/issn/09199268
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I107166
• Web Site: https://www.jstage.jst.go.jp/article/fishsci1994/64/6/64_6_948/_pdf
• 本文言語コード: en
• データソース種別:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可