| | Causative agent/species | Disease | Main host fish |
| | Gram-negatives | | | | Vibrio anguillarum | Vibriosis | Salmonids, turbot, sea bass, striped bass, eel, ayu, cod, and red sea bream | Aliivibrio salmonicida
(formerly Vibrio salmonicida) | Vibriosis | Atlantic salmon, cod | | Vibrio vulnificus | Vibriosis | Eels, tilapia | | Vibrio ordalii | Vibriosis | Salmonids | Vibrio carchariae
(syn.: Vibrio harveyi) | Vibriosis, infectious gastroenteritis | Shark, abalone, red drum, sea bream, sea bass, cobia, and flounder | Moritella viscosa
(formerly Vibrio viscosus) | Winter ulcer | Atlantic salmon | | Photobacterium damselae subsp. piscicida (formerly Pasteurella piscicida) | Photobacteriosis
(pasteurellosis) | Sea bream, sea bass, sole, striped bass, and yellowtail | | Pasteurella skyensis | Pasteurellosis | Salmonids and turbot | Tenacibaculum maritimum
(formerly Flexibacter maritimus) | Flexibacteriosis | Turbot, salmonids, sole, sea bass, gilthead sea bream, red sea bream, and flounder | | Flavobacterium psychrophilum | Coldwater disease | Salmonids, carp, eel, tench, perch, ayu | | Flavobacterium branchiophila | Bacterial gill disease | A broad range of cultured cold water and warm water salmonid and nonsalmonid fishes | | Flavobacterium columnare | Columnaris disease | cyprinids, salmonids, silurids, eel, and sturgeon | | Pseudomonas anguilliseptica | Pseudomonadiasis, winter disease | Sea bream, eel, turbot, and ayu | | Aeromonas salmonicida | Furunculosis | salmon, trout, goldfish, koi and a variety of other fish species | Aeromonas hydrophila
Aeromonas veronii Biovar Sobria
Aeromonas sobria Biovar Sobria
(Motile aeromonads) | Motile aeromonas septicemia (MAS), hemorrhagic septicemia, ulcer disease or red-sore disease, and epizootic ulcerative syndrome (EUS) | A wide variety of salmonid and nonsalmonid fish, sturgeon, tilapia, catfish, striped bass, and eel | | Edwardsiella ictaluri | Enteric septicemia | Catfish and tilapia | | Edwardsiella tarda | Edwardsiellosis | Salmon, carps, tilapia, catfish, striped bass, flounder, and yellowtail | | Yersinia ruckeri | Enteric redmouth | Salmonids, eel, minnows, sturgeon, and crustaceans | | Piscirickettsia salmonis | Piscirickettsiosis | Salmonids |
| | Gram-positives | | | Lactococcus garvieae
(formerly Enterococcus seriolicida) | Streptococcosis or lactococcosis | Yellowtail and eel | | Streptococcus iniae | Streptococcosis | Yellowtail, flounder, sea bass, and barramundi | | Streptococcus parauberis | Streptococcosis | Turbot | | Streptococcus phocae | Streptococcosis | Atlantic salmon | | Renibacterium salmoninarum | Bacterial kidney disease | Salmonids | | Mycobacterium marinum | Mycobacteriosis | Sea bass, turbot, and Atlantic salmon |
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