Effect of high temperature stress on serum biochemical indices of triploid rainbow trout(Oncorhynchus mykiss)
To study the effects of different temperatures(18,21,24,27 ℃)on serum biochemical in-dices of triploid rainbow trout(Oncorhynchus mykiss),300 triploid rainbow trout were randomly di-vided into four groups with three replicates in each group and 25 triploid rainbow trout in each repli-cate for 72 h.The results indicated that the triploid rainbow trout exhibited a stress response at 23℃,accompanied by an increase in respiratory rate.The activities of alanine aminotransferase(ALT)and aspartate aminotransferase(AST)in serum of 24 and 27 ℃ groups were significantly higher than those of 18,21 and 24 ℃ groups at 72 h(P＜0.05).The activity of alkaline phosphatase(AKP)de-creased with the temperature increased and time continued,was significantly higher in 18 ℃ group than in 21,24 and 27 ℃ groups at 48 h and 72 h(P＜0.05).The total bilirubin(T-BIL)content in-creased with the increase of temperature,and there was a significant difference among all groups at 24,48 and 72 h(P＜0.05).The contents of total protein(TP)and globulin(GLO)initially in-creased and subsequently decreased with rising temperature,the albumin(ALB)content in the 24 ℃ group exhibited an upward trend,while the 27 ℃ group demonstrated a downward trend,with signifi-cant differences observed at various time points(P＜0.05).Research indicated that the triploid rain-bow trout exhibit a stress response when exposed to water temperatures of 23 ℃,and short-term heat stress at temperatures exceeding 24 ℃ significantly impaired liver function in triploid rainbow trout,thereby affecting their growth and survival.
Oncorhynchus mykisshigh temperature stressserumbiochemical indices
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