Submerged suspension culture system of iwagaki oyster Crassostrea nippona using an artificial steel reef
2008
Shirafuji, N.(Kyoto-fu. Inst. of Oceanic and Fishery Science, Miyazu (Japan)) | Wada, Y. | Nishigaki, T. | Yatsuya, K. | Takeno, K.
A new culture system, 'submerged suspension culture system', has been devised for iwagaki oyster Crassostrea nippona in the open sea. This system consisted of an artificial steel reef and ropes of 5 m in length with seeds of the oyster, and floating buoy attached at one end of the rope. The culture experiment by the new system was carried out at a 10m depth in the sea from February 2003 to June 2006. The results obtained from the experiment were summarized as follows. (1) All the culture facilities were not damaged by typhoons or winter storms during the experiment. (2) About 60% of the oysters after three-year culture were reached in the harvestable size of more than 200 g in total weight including shell. The condition index (=soft tissue weight/total weight) of them was greater than that of wild oysters in same commercial size. (3) There were few attached organisms observed on the cultured oysters and the culture facilities, when compared with the hanging culture. As a result the maintenance work of the system was unnecessary. The present study suggested that the new culture system was effective and could be used for commercial iwagaki oyster culture in the open sea.
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