| Budget Amount *help |
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2014: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2013: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2012: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
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| Outline of Final Research Achievements |
Hatchery-reared short-neck clam (Ruditapes philippinarum), kuruma prawn (Marsupenaeus japonicus) and tiger puffer juveniles (Takifugu rubripes) are released into the same tidal flat, however, they can be in predator-prey relationship at the nursery area. However, it is unclear whether predator-prey relationship occur among these seedlings. We examined Exp.1) feeding habits of puffer juveniles in the wild and release-experiment of these 3 species into a mesocosm, and Exp.2) size-related predator-prey relationship between 2 species among above 3 species. Exp.1) Tiger puffer juveniles (40 mm) mainly preyed on crustaceans in the wild. In the mesocosm, small short-neck clam (3.2 mm shell-length) greatly decreased when 3 species co-existed. Exp.2) Tiger puffer (40-100 mm) preyed on both kuruma prawn (20-118% of puffer’s SL) selectively than short-neck clam (about 3 mm). Kuruma prawn (23.1-141.2 mm BL) preyed on short-neck clam (1.6-10.4 mm shell-length).
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