| Budget Amount *help |
¥5,460,000 (Direct Cost: ¥4,200,000、Indirect Cost: ¥1,260,000)
Fiscal Year 2014: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2013: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2012: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
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| Outline of Final Research Achievements |
The native Japanese strain of common carp has been dramatically affected by invasion of conspecific domesticated strains from Eurasia (introduced stains). Meanwhile, Lake Biwa, the largest freshwater body in Japan, harbors a relatively pure native population of common carp. In this study, reproductive ecology of the native population in Lake Biwa was investigated by genotyping of eggs attached to the vegetation in shallow coastal areas. The eggs were collected at a coastal area in Nagahama City during the reproductive season (from April to August). In the lake, water level is artificially controlled, being kept low after 16 June. Although the low water level reduces the shallow coastal areas in the lake, not a few eggs were obtained even in the low water level period (July and August). Four years (2012-2015) survey indicated that frequency of native strain egg in egg population tended to be higher in July and August than in April and May.
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