| Budget Amount *help |
¥33,800,000 (Direct Cost: ¥26,000,000、Indirect Cost: ¥7,800,000)
Fiscal Year 2015: ¥7,150,000 (Direct Cost: ¥5,500,000、Indirect Cost: ¥1,650,000)
Fiscal Year 2014: ¥10,140,000 (Direct Cost: ¥7,800,000、Indirect Cost: ¥2,340,000)
Fiscal Year 2013: ¥16,510,000 (Direct Cost: ¥12,700,000、Indirect Cost: ¥3,810,000)
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| Outline of Final Research Achievements |
The protozoan parasite Perkinsus olseni is widely spread at high intensity in Manila clam populations in Japan. We conducted the present study to find measures to propagate Manila clam populations in coastal waters contaminated with P. olseni. Field surveys and experiments suggested that the removal or depletions of infected adult manila clams decreased the infection to juveniles, that the infection prevailed slow in juvenile Manila clams in semi-open facilities such as shrimp ponds, and that transmission of the infections were low in low water temperature season. These results suggest that intensive captures of infected adult clams before recruitment ofjuveniles, intermediate fatting of clam seed in semi-open facilities and release of juvenile clams in autumn are effective for propagation and recovery of wild Manila clam in waters infected with the parasite.
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