In recent years,harmful algal blooms(HABs)have caused significant damage to ecosystems and public health around the world,and the bloom occurrences are increasing in frequency and intensity.The dinoflagellate Gymnodinium impudicum is a typical HAB species,isolation and characterization of algicidal bacteria will be bene-ficial to control its blooms.In this study,isolation of an algicidal bacterium LD-B3 against G.impudicum was per-formed.16S rDNA analysis showed that LD-B3 belonged to genus Pseudoalteromonas.After 72 h of LD-B3 bacteri-um culture addition,the algicidal rate reached up to 81.06%after adding with 2.0%at final concentration.As re-sult,algicidal activity was shown both concentration and time dependent.The results of microscopic observation and measurement of physiological parameters showed that strain LD-B3 could lead to the breakage of G.impudicum cell chain and the decrease of Fv/Fm.Moreover,our results indicated that strain LD-B3's extracellular compounds were involved in algicidal activity,and these substances,probably a protein compound,were sensitive to tempera-ture.Generally,these findings indicated that the strain LD-B3 is a potential source of bacterial to mitigate G.impu-dicum blooms.
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