The bacteria Lactobacillus rhamnosus via feed reduces mortality from:

Correct option is A

Correct Answer: (a) Furunculosis
Explanation:
→ Lactobacillus rhamnosus, used as a probiotic, enhances immunity and reduces mortality from Furunculosis (caused by Aeromonas salmonicida).
→ It improves gut health and produces antimicrobial metabolites.
Information Booster:
→ Probiotics reduce antibiotic dependence in aquaculture.
Additional Information:
(b), (c), (d): Not strongly associated with probiotic-mediated protection.