| Budget Amount *help |
¥5,590,000 (Direct Cost: ¥4,300,000、Indirect Cost: ¥1,290,000)
Fiscal Year 2014: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2013: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2012: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
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| Outline of Final Research Achievements |
Japanese common sea cucumber Apostichopus japonicus with numerous and long papillae have a high market value. The present study aimed to contribute to the development of selective breeding for enhancing papilla characteristics in this species. The number of papillae in different habitats is related to latitude, with more northerly distributed populations possessing more numerous papillae. This knowledge is important in terms of searching for excellent materials for selective breeding. Allele frequencies of microsatellite DNA markers are also related to latitude. This suggests that the species has gradually expanded its distribution, and that genetically different populations with different papilla characteristics have evolved. The relationship between body size and the number of papillae, which is clearly visible, showed a positive correlation in northern populations. In southern populations, however, there was no clear correlation between growth and the number of papillae.
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