Kappahycus alvarezii is a red alga contained large amount of bioactive material, such as carrageenan. Carrageenan is useful as a raw material for several industries and can be degraded by marine bacteria through breaking the linkages in polysaccharide carrageenan into oligosaccharide carrageenan. The aim of this study is identification of degrading carrageenan in K. alvarezii symbiotic bacteria. The results showed there was 14 isolate bacteria, and all of the isolates have clear zone on congo

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... d staining activity. The isolate bacteria were 7 genera as K. alvarezii symbiotic bacteria, such as Labrenzia sp., Alteromonas sp., Vibrio sp., Celeribacter sp., Pseudoalteromonas sp., Phaeobacter sp. and Cobetia sp. Labrenzia sp., Alteromonas sp., Vibrio sp., Pseudoalteromonas sp., Phaeobacter sp. were recognized to have strong interactions with carrageenan in red algae, while the other Celeribacter sp. and Cobetia sp. have strong interactions with alginate in brown algae.