Profitability of three-year hanging culture of iwagaki oyster Crassostrea nippona and optimal initial spat density
2006
Itani, M.(Kyoto-fu. Inst. of Oceanic and Fishery Science, Miyazu (Japan)) | Tanaka, M. | Fujiwara, M.
To increase the profitability of culture of Iwagaki oyster, it is thought to be effective to develop a large oyster weighing over 300 g in gross weight of the whole body, which receives a high price in the market. So investigation of two-year culture and three-year culture was carried out. Based on the harvest number in each weight class, the income from two-year culture and that from three-year culture were calculated. As a result, income per year for three-year culture was estimated to be about eight-hold greater than that of two-year culture. Therefore, the profitability of three-year culture is thought significantly higher than that of two-year culture. When we performed Iwagaki culture for three years, the harvest number of oysters weighing over 300 g and the profit obtained by the culture was maximized by setting the number of spats at 25.
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