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《Freshwater Fisheries》 2010-04
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The immune responses of yellow catfish (Pelteobagrus fulvidraco) and its susceptibility to Aeromonas hydrophila at different dissolved oxygen levels

SHEN Fan,FAN Qi-xue,YANG Kai,LI Bo,ZHANG Lei,YANG Lei,ZHAO Qiao-e,SUN Cun-jun,YANG Wei(Key Laboratory of Freshwater Biodiversity Conservation and Utilization,Ministry of Agriculture,School of Fishery,Huazhong Agriculture University,Wuhan 430070)  
The immune responses and susceptibility to Aeromonas hydrophila infection in yellow catfish,Pelteobagrus fulvidraco,after 8 weeks exposure to different dissolved oxygen concentrations(A,2.28±0.56 mg/L,B,4.04±0.38 mg/L,C,6.51±0.64 mg/L and D,9.11±1.24 mg/L) in water were investigated.Spleen-somatic index(SpSI,),number of red blood cell(RBC,×106 cells/mm3) and white blood cell(WBC,×104 cells/mm3),phagocytic percent of WBC(PP,%),lymphocyte transformation rate(LTR,%),serum cortisol level and lysozyme activity,as well as cumulative mortality rate(mortality rate within one week after infected with A.hydrophila,%),were measured as indices.The results showed that chronic hypoxia stress caused decreases of SpSI,PP and LTR,increases of RBC,WBC and cumulative mortality rate:SpSI and PP of the fish in treatment A were significantly lower(P0.01) and LTR was significantly lower(P0.05) than those in other treatments.RBC of the fish in treatment A was significantly higher than that in other treatments(P0.05) while WBC was significantly higher than that in treatments C and D(P0.05).SpSI of the fish was remarkably lower(P0.01) while LTR and PP were significantly lower(P0.05) in treatment B than that in treatments C and D.Cumulative mortality rate of the fish in treatment A was significantly higher than that in treatment B(P0.05) and than those in treatments C and D(P0.01).These results suggested that there was an inhibiting effect on the immune responses in P.fulvidraco exposed to low DO levels.No significant differences in serum cortisol level and lysozyme activity were observed among four treatments,which suggested that serum cortisol level and lysozyme activity were not the stress indicators during chronic hypoxia stress.
【Fund】: 国家科技支撑计划项目(No.2007BAD37B02);; 湖北省“十一五”重大科技攻关项目(No.2006AA203A01)
【CateGory Index】: S917.4
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