Significance of the suspended culture of asari clam Ruditapes philippinarum and obstacles to increasing its use
2017
Higano, J. (National Research Institute of Fisheries and Environment of Inland Sea, Japan Fisheries Research and Education Agency, Hatsukaichi, Hiroshima (Japan)) | Asao, D.
Asari clam Ruditapes philippinarum is one of the most important fisheries species in Japan. Most of the production of this clam is from the wild catch, and the culture production in tidal flats accounts for only 6% to 7% of the total production. The recently established suspended culture of asari clam has not been widely used in Japan or elsewhere. Considering the sharp decline of the wild catch in Japan since the 1980s, it is worthwhile attempting to expand culture production, especially in suspended culture. Clam culture requires a seed supply and appropriate facilities and materials. This paper discusses techniques for natural seed collection using mesh bags and the materials and locations required for suspended culture. To disseminate the suspended culture, the culture procedure should be designed to suit the environmental conditions and ensure economic profitability, which depends on the unit price and the cost of the seed and the materials. It is essential to increase the added value, emphasizing the localness of the cultured clams by utilizing natural seeds collected in local areas. Pre-culture in tidal flats in combination with subsequent suspended culture may be useful to increase the efficacy of culture production.
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