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Sixty five strains belonging to nine genera were recovered from six Laminaria samples collected from Kongsfjorden Bay of Arctic in 2011, in which Psychrobacter (33/65), Psychromonas (10/65) and Polaribacter (8/65) were the predominant groups (75% of the total strains) . Moreover, 21 alginate lyase-excreting strains were further screened from these Laminaria-associated bacteria. These alginate lyase-excreting strains belong to five genera including Psychrobacter, Winogradskyella, Psedoalteromonas, Psychromonas and Polaribacter. Among them, the genera Psychromonas (8/21), Psedoalteromonas (6/21) and Polaribacter (4/21) are the predominant ones, and Psychrobacter, Winogradskyella, Psychromonas and Polaribacter were first found to produce alginate lyases.