ペプチドグリカンの長期経口投与がニジマス稚魚の抗病性と成長に及ぼす影響

概要

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Juvenile rainbow trout, weighing 0.12g on average, were fed on diets containing 0.2 and 2mg/kg of peptidoglycan (PG) derived from bifidobacterium thermophilum at a ratio of 3% body weight (BW) for 56 days, so that fish were given 6μg or 60μg PG/kg BW per day. On days 28 and 56, fish were challenged by immersing them in Vibrio anguillarum suspension, and the mortality was monitored for 21 days. PG did not influence the growth of fish at these doses. On day 28, PG-administrated groups showed a significantly higher survival rate compared with the control group. On day 56, however, no significant difference in the survival rates was observed between the PG-administrated group and the control group at either dose. These results indicate that the oral administration of PG enhances the resistance of rainbow trout against V. anguillarum infection, and a longer administration of more than 28 days may lead to a decrease in disease resistance.
日本水産學會の論文