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Today, the problem of seaweed is the emergence of ice-ice disease, which causes economic losses. The solutions offered at this time are not significant, so there is a need for technology that can control the ice-ice disease. The effort is to use mangrove leaves to extract  Avicennia marina . This study aimed to evaluate the inhibitory potential of mangrove leaves extract  A. marina  against bacteria that cause ice-ice disease in seaweed. Four pathogenic bacteria that cause ice-ice in seaweed, namely  Stenotrophomonas maltophilia  strain IAM 123,  Shewanella haliotis  strain DW01,  Vibrio alginolyticus  strain ATCC 17749 and  Pseudomonas aeruginosa  strain SNP0614 were tested using  A. marina  leaves extract with methanol solvent, the method used is the maceration method and antibacterial activity test using the  Kirby-Bauer  method with seawater complex (SWC) agar. The results showed phytochemical compounds found in  A. marina  leaves extracts, namely alkaloids, saponins, tannins, phenolics, flavonoids, triterpenoids, and glycosides.  A. marina  leaves extract using methanol solvent shows potential as an antimicrobial which is indicated by inhibition zones in each of the bacteria that cause ice-ice.

Evaluation of inhibitory potential of mangrove leaves extractAvicennia marinafor bacteria causingice-icediseases in seaweedKappaphycus alvarezii