| Budget Amount *help |
¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
Fiscal Year 2017: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2016: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2015: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
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| Outline of Final Research Achievements |
Masu salmon exhibits typical fixed male alternative reproductive tactics. The large anadromous males fight before spawning to achieve dominant access to the females, whereas the small parr males adopt a sneaker tactic to dart into spawning events and furtively position themselves under ovipositing females to release milt near the female as she releases her eggs and ovarian fluid. Sperm competition theory predicts that milt from multiple males enhance the fertilization competition because serum included in milt affect the sperm velocity, which is one of the important factor to determine the success of fertilization. The objective of this study is to investigate effect mixture of milt from parr males and anadromous males on hatching rate of eggs. Hatching rate was higher in mixture of parr and anadromous males than in same tactics group. Our results indicated that mixture of milt from parr and anadromous males improve the quality of hatching eggs.
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