Challenge to natural seed collection of asari Ruditapes philippinarum: The case in Gokasho Bay, Mie, Japan
2017
Hasegawa, N. (National Research Institute of Aquaculture, Japan Fisheries Research and Education Agency, Mie (Japan)) | Fujioka, Y. | Ishihi, Y. | Watanabe, S. | Higano, J. | Mizuno, T. | Hata, N. | Nishihama, T. | Yamakawa, M.
The efficacy of using polyethylene net bags containing gravel and pelletized oyster shell powder for natural seed collection of asari clam (Ruditapes philippinarum) was tested at ten study sites along the coast of Gokasho Bay, Mie, Japan. Numerous clams were collected in tidal flats on the left side of river mouths. In the tidal flat around the mouth of Gokasho River, where the largest number of clams were collected among the ten sites, the level of clam collection was high in the lower parts of intertidal areas and subtidal areas. However, the survival rate of the clams was lower in the subtidal areas than in the intertidal ones. The large spatial differences in collectability and survival of the clam seeds observed in this study indicate that pre-assessment of the collection site plays a critical role in effective clam seed collection by using net bags on a large scale.
显示更多 [+] 显示较少 [-]