Study on the quantity dynamic changes of heterobacteria and vibrios in larvae industrialized culture system
2008
Ma Yan | Li Jian | Wang Bin | Wang Qun | Liu Qi
[Objective]The dynamic change of heterobacteria and vibrios in larvae industrialized culture was studied to provide scientific reference for healthy cultivation of shrimp.[Method]The heterobacteria, vibrios and pathogenic vibrio parahaemolyticus were monitored in larvae industrialized culture system.[Result]The heterobacteria, vibrios and pathogenic vibrio parahaemolyticus were the most in fertilized eggs of shrimp and the least in nauplius then their number would increase with growth. During whole rearing period,both heterobacteria in larvae and vibrios in water would increase by one order of magnitude, while both vibrios in larvae and heterobacteria in water would increase by two orders of magnitude.There were many heterobacteria and vibrios but few vibrio parahaemolyticus in living bait.The correlation coefficients between larvae and heterobacteria and vibrios in water were 0.704 and 0.840 in culture system respectively, while the correlation among heterobacteria, vibrios in living bait and larvae, water were weak or negative.[Conclusion]There was a dynamic relation between water and larvae in rearing period, and restrictly control of culture condition would restrain the occurrence of disease caused by vibrio parahaemolyticus, besides that bacteria number in bait was not obviously correlated with bacteria number in culture system.
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