Inhibitory Effects of Testosterone on Downstream Migratory Behavior in Masu Salmon, Oncorhynchus masou(Behavior Biology)

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概要

• 論文の詳細を見る

• The effects of testosterone (T) on downstream migratory behavior of yearling masu salmon, Oncorhynchus masou, were studied during its downstream migratory period using artificial raceways. In experiment 1, 22 and 19 smolts were implanted with a medical silicone tube capsules containing 500μg of T or vehicle only. These groups were transferred together to the upper pond of artificial raceway which was connected to the lower pond through fish-way. Downstream migratory behavior was then observed for 1 week. In experiment 2, T500μg-, T50μg-, and T5μg-treated smolts, control smolts, and precociously mature males were transferred to the upper pond of the raceway and downstream migratory behavior was observed for 2 months. In experiment 3, 40 smolts were implanted with capsules containing 500μg of T or vehicle only. These groups were transferred separately to the upper ponds of raceways and downstream migratory behavior was observed for 3 weeks. In each experiment, injection of T caused increases in plasma T levels within physiological levels. In experiment 1, frequency of downstream migratory behavior was 89.5% in the control group and 31.8% in the T500μg-treated group. In experiment 2, the frequency was lower in the T500μg- and T50μg-treated groups than in the control group. T5μg implantation failed to inhibit downstream migratory behavior. Precocious males were not observed to go down the raceway. In experiment 3, frequency of downstream migratory behavior of the control group and the T500μg-treated group was 100 and 40%, respectively. In each experiment, plasma levels of T in T500μg-treated smolts which did not show downstream migratory behavior was higher than those of migrants. These results indicate that the downstream migratory behavior of masu salmon smolts is inhibited by physiological levels of T.

• 社団法人日本動物学会の論文
• 2000-09-20

著者

• AIDA KATSUMI

  Graduate School of Agricultural and Life Sciences, The University of Tokyo

• Aida Katsumi

  Department of Aquatic Bioscience, Graduate School of Agricultural and Life Sciences, The University

• Aida K

  Department Of Aquatic Bioscience Graduate School Of Agricultural And Life Sciences University Of Tok

• Amano M

  School Of Marine Biosciences Kitasato University

• Amano Masafumi

  School Of Fisheries Sciences Kitasato University Sanriku

• Aida Katsumi

  Department Of Aquatic Bioscience Graduate School Of Agricultural And Life Sciences The University Of

• Aida Katsumi

  Department Of Aquatic Bioscience Graduate School Of Agricultural And Sciences The University Of Toky

• Aida Katsumi

  Department Of Aquatic Biosciences Graduate School Of Agricultural And Life Sciences The University O

• Kitamura S

  Japan International Research Center For Agricultural Sciences

• Ikuta Kazumasa

  Nikko Branch, National Research Institute of Aquaculture

• Kitamura Shoji

  Nikko Branch, National Research Institute of Aquaculture

• Asahina K

  Univ. Utrecht Utrecht Nld

• Aida Katsumi

  Laboratory Of Aquatic Animal Physiology Graduate School Of Agricultural And Life Sciences The Univer

• Munakata Arimune

  Department of Aquatic Bioscience, Graduate School of Aaricultural and Life Sciences, The University

• Ikuta Kazumasa

  Nikko Branch National Research Lnstitute Of Aquaculture

• Ikuta Kazumasa

  Nikko Branch National Research Institute Of Aquaculture Japan Fisheries Agency

• Aida K

  Department Of Aquatic Bioscience Graduate School Of Agricultural And Life Sciences The University Of

• Munakata Arimune

  Department Of Biology Miyagi University Of Education

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