マガキ(Crassostrea gigas)幼生の成育におよぼす餌料微生物(微細藻類,酵母,細菌)の影響

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  • Effect of Planktonic Diets(Microalgae, Yeast and Bacterium) on the Growth of Larval Oyster(Crassostrea gigas)

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マガキ(C.gigas)幼生の成長,生残,変態,付着におよぼす餌料生物の影響を検討した。試験餌料生物として硅藻Chaetoceros gracilis, Chaetoceros calcitrans,ハプト藻Pavlova lutheri,真正眼点藻Nannochloropsls oculata,海産酵母MY-1,光合成細菌Rhodobacter capsulatusを用いた。これらを単独給餌した場合,C.gracilisが最も優れた餌料であり,ついでC.calcitrans,P.lutheriが良く,N.oculata,海産酵母,光合成細菌は餌料として不適当であることがわかった。しかし,海産酵母を給餌した幼生の生残率は高く,成長の良い他の餌料と併用することにより,良好な成長に加えて生残率をさらに高めることが出来た。

Feeding experiments on the larvae of Pacific oyster(Crassostrea gigas)were carried out to find a suitable natural diet for growing of the juvenile in the indoor hatchery. The D-veliger larvae were reared in six 30 ι tanks in each experiment (three experiments in all) with 20 ι membrane-filtered sea water at 25℃, changing the rearing water every three days over 18-24 days. Four microalgae, Chaetoceros gracilis, Chaetoceros calcitrans, Pavlova lutheri and Nannochloropsis oculata, marine yeast MY-1 and photosynthetic bacterium Rhodobacter capsulatus were fed as a single or combined diet once a day in the afternoon. Each diet was supplied with the same cell volume. The results were as follows: C. gracilis, C.calcitrans and P. lutheri were effective in the order to bring a good growth, survival, methamorphose to umbo-veliger and settlement of the larvae. However, N. oculata, MY-1 and R. capsulatus brought a worse growth and survival of the larvae. On the other hand, enhanced survival effects were observed for marine yeast MY-1 fed in either single or mixing with other algae.

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