Improving the quality of <i>Corbicula sandai</i> by rearing in a short period

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  • 短期間飼育によるセタシジミの高品質化
  • タンキカン シイク ニ ヨル セタシジミ ノ コウヒンシツカ

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Abstract

<p>　To improve the quality of Corbicula sandai in a short period, the increment in glycogen content by various feeds, and the uptakes of microalgae and amino acids by administration of the feeds in breeding water, were validated. When glucose (1 g/L) or soluble starch (3 g/L) was fed for 5 days, glycogen content was significantly increased, suggesting that soluble sugar sources could be available for effective synthesis of glycogen. Feeding microalgae (2.0×104 cells/mL of Euglena sp.) for 24 h led to an increase in chlorophyll content of the mid-gut gland, suggesting that microalgae were effectively incorporated in the bivalves. Rearing in amino acid solutions (24 mM of glycine, alanine, taurine and glutamic acid) for 24 h increased some of these contents (glycine, alanine and taurine), suggesting that glycine, alanine and taurine were effectively incorporated in the bivalves. When rearing in glycine solution (24 mM) for 24 h under hyperosmotic stress (3‰ salinity), glycine content was significantly increased compared to rearing without osmotic stress. The findings suggest that the quality of bivalves could be improved in a short period by increasing glycogen content, applying nutriments included in microalgae and enhancing free amino acid contents as taste components or functional ingredients.</p>

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