著者

安藤 大成 下田 和孝 竹内 勝巳 飯嶋 亜内 卜部 浩一 神力 義仁 中嶋 正道

出版者

公益社団法人 日本水産学会

雑誌

日本水産学会誌 (ISSN:00215392)

巻号頁・発行日

vol.85, no.5, pp.487-493, 2019-09-15 (Released:2019-09-28)

参考文献数

36

被引用文献数

1

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サクラマスの脊椎骨数を人工種苗と野生魚で比較した。また,人工種苗が放流されてきた河川のサクラマス野生魚の脊椎骨数を調べた。人工種苗の脊椎骨数は野生魚よりも少ない値を示し,この差異は,発生時の水温の違いにより生じていると考えられた。長期間,種苗放流が行われてきた河川のサクラマス野生魚の脊椎骨数は,近隣河川の野生魚に比べて少ない傾向を示した。これより,種苗放流は野生魚の脊椎骨数に遺伝的な影響を及ぼす可能性が示唆された。

著者

太田 博巳 神力 義仁 本間 正男

出版者

公益社団法人 日本水産学会

雑誌

日本水産学会誌 (ISSN:00215392)

巻号頁・発行日

vol.52, no.4, pp.609-611, 1986-04-25 (Released:2008-02-29)

参考文献数

10

被引用文献数

4 6

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In the case of artificial fertilization practiced in salmonids, rinsing of unfertilized eggs with an isotonic solution (ISER), consisting of 154.7mM NaCl, 3.2mM KCl and 2.3mM CaCl2, has been widely used to avoid contamination of the yolk from broken eggs which often causes infertility of the spermatozoa. Experiments were carried out in the masu salmon Onchorhynchus masou to determine the effect of osmolality and ionic composition of the solution on sperm motility. In ISER, duration of sperm motility was about 6 and 2.5-3 times longer than that in distilled water and isotonic NaCl or CaCl2 solutions, respectively. The maximum duration of sperm motility was obtained in the isotonic condition (300mOsm/kg) when the semen was dilated with solutions of the same ionic composition as ISER. A complete lack of either NaCl or CaCl2 from the isotonic solution resulted in a significant decrease in sperm motility, but that of KCl did not affect the motility. Duration of sperm motility was prolonged successfully in varying mix-tures of NaCl and CaCl2 of the constant osmalality at 300mOsm/kg in the range from 1 to 50mM CaCl2. It is concluded that the isotonic solution of NaCl with 1-30mM CaCl2 is fully efficient as a sperm diluent for the masu salmon, and that the addition of KCl is not necessarily essential for the diluent.