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Screening for chitinolytic activity in the bacterial strains from different Pacific Ocean regions revealed that the highly active representatives belong to the genera <i>Microbulbifer</i>, <i>Vibrio</i>, <i>Aquimarina</i>, and <i>Pseudoalteromonas</i>. The widely distributed chitinolytic species was <i>Microbulbifer</i> isolated from the sea urchin <i>Strongylocentrotus intermedius</i>. Among seventeen isolates with confirmed chitinolytic activity, only the type strain <i>P. flavipulchra</i> KMM 3630^T and the strains of putatively new species <i>Pseudoalteromonas</i> sp. B530 and <i>Vibrio</i> sp. Sgm 5, isolated from sea water (Vietnam mollusc farm) and the sea urchin <i>S. intermedius</i> (Peter the Great Gulf, the Sea of Japan), significantly suppressed the hyphal growth of <i>Aspergillus niger</i> that is perspective for the biocontrol agents’ development. The results on chitinolytic activities and whole-genome sequencing of the strains under study, including agarolytic type strain <i>Z. galactanivorans</i> Dji^T, found the new functionally active chitinase structures and biotechnological potential.