Effects of Bdellovibrio-and-like organism on growth of Haliotis diversicolor aquatilis and bacterial community in rearing system

In this study, Bdellovibrio -and-like organism strain BDH12 (GenBank accession No. EF094471) was applied in a 63-day rearing of Haliotis diversicolor aquatilis, and its effects on abalone growth, the total number of bacterial and Vibrio both in rearing water and abalone intestine and community structure of rearing water were investigated. The results showed that the survival rate, abalone length and weight of BDH12 added groups significantly increased by 111%, 1.8% and 7.0%, respectively, compared with the control. The total number of bacterial and Vibrio of BDH12 added tanks in abalone intestine significantly reduced by 8.6%-21.0% and 12.2%-27.7%, and in water they reduced by 2.1%- 16.7% and 8.0%-34.8%, respectively, compared with the control. PCR-DGGE profiles revealed that the richness value of bacterial communities of the control and the test groups were 0.54-0.97 and 0.50-0.75. The results indicate that BDH12 can be used as a bio-control/probiotic agent in H. diversicolor aquatilis culture.