6
Noncytochrome oxidase - containing Gram - negative bacteria pathogenic for fish
EXPLANATION
Functional Feeds, Probiotics, Prebiotics, Syn
- Cytochrome Oxidase-Negative Fish Pathogens:
- Bacterial fish pathogens belonging to the family Enterobacteriaceae are characteristically Gram-negative, facultatively anaerobic rods that are cytochrome oxidase-negative:
- Edwardsiella tarda (1): Oxidase-negative (causes edwardsiellosis / emphysematous putrefactive disease).
- Yersinia ruckeri (2): Oxidase-negative (causes enteric redmouth disease in salmonids).
- In contrast, Flavobacterium columnare is oxidase-positive.
- Both 1 and 2 are oxidase-negative pathogens.
- Correct Option: Option 4 (1 & 2).
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