The present invention relates to a 3-20A1M strain of the genus Erythropobacter which produces pyrrole-2-carboxylic acid and has an apricot activity, and a use thereof, a 3-20A1M strain of the genus Erythrobacter of the present invention or a pyrrole-2- separated therefrom Carboxylic acid can selectively be used as a biological algicide because it can effectively control red tide while minimizing the impact of the marine primary producer ecosystem because it selectively exhibits a red algae effect only to the coclodinium algae causing red tide.
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