| Budget Amount *help |
¥103,220,000 (Direct Cost: ¥79,400,000、Indirect Cost: ¥23,820,000)
Fiscal Year 2017: ¥21,450,000 (Direct Cost: ¥16,500,000、Indirect Cost: ¥4,950,000)
Fiscal Year 2016: ¥21,450,000 (Direct Cost: ¥16,500,000、Indirect Cost: ¥4,950,000)
Fiscal Year 2015: ¥21,450,000 (Direct Cost: ¥16,500,000、Indirect Cost: ¥4,950,000)
Fiscal Year 2014: ¥17,550,000 (Direct Cost: ¥13,500,000、Indirect Cost: ¥4,050,000)
Fiscal Year 2013: ¥21,320,000 (Direct Cost: ¥16,400,000、Indirect Cost: ¥4,920,000)
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| Outline of Final Research Achievements |
Pacific salmon has both semelparous and iteroparous species. Rainbow trout, which is a primitive salmon shows iteroparity and maintained their type-A spermatogonia in their post-spermiated testes. Germ cell transplantation assay revealed that the type-A spermatogonia possessed stem cell population. On the other hand, sockeye salmon, which is an evolved species shows semelparity and did not possess any type-A spermatogonia in their post-spermiated testes. This change was continuous phenomenon and masu salmon and Chinook salmon, which are evolutionally positioned between above-mentioned two species possessed reproductive characteristics somewhere between rainbow trout and sockeye salmon. Germ cell transplantation study also revealed that the iteroparous rainbow trout produced gametes of sockeye salmon and Chinook salmon multiple times in their gonads.
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