| 摘要 |
A method of relieving stress in fish and increasing resistance to pathogenic agents comprising orally administering to the fish an amount of a compound of the formula <IMAGE> I wherein R is alkyl of 1 to 4 carbon atoms and X is acyl of an organic carboxylic acid of 1 to 18 carbon atoms sufficient to relieve stress and increase resistance to pathogenic agents and novel fish feed containing an effective amount of a compound of formula I.
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