Isolation and Identification of Algicidal Bacteria from Penaeus vannamei Cultural Water
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Abstract:
In this study, 10 strains of bacteria were isolated from the culture water collected from the Penaeus vannamei shrimp farms, subjected to molecular identification and phylogenetic tree analysis, and evaluation of their inhibitory effects on Anabaena cylindrica FACHB-82. The 16S rRNA gene analysis showed that three strains resembled the most Pseudomonas (P. plecoglossicidc, P. protegens and P. monteilii), with one strain similar to Aeromonas veronii, two similar to Thauera mechernichensis and Thauera aromatica, one similar to Bacillus subtilis, one similar to Microbacterium flavum, one similar to Flavobacterium cauense, and one similar to Chryseobacterium nakagawai. Bacterial strain AB-3 exhibited the greatest inhibition, with a rate of 87.11% against Anabaena cylindrica FACHB-82. In addition, AB-3 had inhibition rates of 79.89% and 23.65% against Aphanizomenons flos-aquae and Microcystis aeruginosa, inhibited chlorella vulgaris to some extent, but exerted insignificant inhibitory effect on Chlamydomonas reinhardtii. In this study, the Taueus strain, AB-3, isolated from the culture water had a significant algicidal effect on the cyanobacteria, whilst no or little inhibitory effect on chlorella.
