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The biocide sodium hypochlorite (NaOCl) is widely used for controlling algal growth, and this application can be extended to marine environments as well. This study evaluates the biocidal efficiency and cellular toxicity of NaOCl on the harmful dinoflagellate Cochlodinium polykrikoides, with emphasis on pigment production and antioxidant enzyme activity. The test organism showed dose-dependent decrease in growth rate on exposure to NaOCl, and the 72 h EC 50 was measured to be 0.584 mg L -1 .doi:10.4490/algae.2014.29.4.311 fatcat:wqoomaa4srfhxm3gjsoy75fmn4