《Table 1 Growth of cultivable bacteria isolated from sediments in Tianjin Port in different saliniti

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《中国天津港海底吹填淤泥中嗜盐细菌的分离及遗传分析（英文）》

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Fig.3 and Table 1 summarized the diurnal variation and sums of bacteria cultivated in the seven salt concentrations in the culture medium.With each stepwise increase of salinity from 0.5%to20%，the number of total bacterial colonies in each group decreased.For example，the number of total bacterial colonies in the 0.5%salinity medium was12.9-fold that of the 20%salinity culture（Fig.3）.The results demonstrated that bacteria grew faster in the 0.5%salinity culture compared with higher concentrations，and bacterial colonies were observed after 12 h.Bacterial growth was slower in the 15%and 20%salinity cultures，and colonies were only observed after 60 and 72 h，respectively（Table 1）.In conclusion，when the salinity was 0～5%，there were more isolated bacteria，and they grew faster.As the salinity increased from 10%to 20%，the number of cultivable bacterial strains decreased dramatically and growth slowed.Therefore，a salt concentration ranging from 5%to 10%is optimal for most salt resistant strains isolated from the marine sediment.