The dynamic distribution of some main bacteria in the marine shoal mud

Objective To study the dynamic distribution of heterotrophic bacteria,ammonifying bacteria,denitrifying bacteria,sulphate reducing bacteria,and the microflora of the heterotrophic bacteria in the marine shoal mud.Methods The method of agar plate count was used to study the number of heterotrophic bacteria(HB),while the quantitative distribution of denitrifying bacteria(DB),ammonifying bacteria(AB) and sulphate reducing bacteria(SRB)were investigated by the method of MPN.The Bacterial strains were identified to the genus level according to the references.Results The HB numbers ranged from 8.00×10~3 CFU/g to 7.60×10~4 CFU/g,while the numbers of DB,AB and SRB ranged from 5.00×10~2 to 5.00×10~4cell/g,3.00×10~5 to 5.00×10~7cell/g and 9.00×10~4 to 9.00×10~6cell/g,respectively.Temperature had no obvious effect on the numerical distribution of the above mentioned bacteria.All the isolated bacteria mainly belong to 15 genera,some genera of Enterobacteriaceae,and the predominant genera were some genera of Enterobacteriaceae,Clostridium,Bacillus,Corynebacterium,Photobacterium and Pseudomonas.The positive detection rates of DB,AB and SRB were 100%,and the contents were high,too.Conclusion It was important to regulate rational breed capacity and distribute a new breed environment.