Which of the following is hypertrophic disease?

Correct option is A

Correct Answer: (a) Lymphocystis
Explanation:
→ Lymphocystis disease virus (LCDV) causes massive hypertrophy of fibroblasts in fish skin and fins.
→ Produces characteristic white, cauliflower-like nodules.
→ Hypertrophy occurs due to viral replication inside host cells.
Information Booster:
→ Usually non-lethal but reduces market value of fish.
Additional Information:
(b) Mycobacteriosis: Chronic granulomatous disease.
(c) MAS: Motile Aeromonas Septicemia (bacterial).
(d) Hitra: Viral disease of salmon.