Gillnet disease is caused by

A. virus

B. bacteria

C. fungi

D. actinomyces

Answer: Option B

Solution(By Examveda Team)

Gillnet disease is caused by bacteria.
Bacterial gill disease typically occurs as a result of poor living conditions, such as overcrowding, poor water quality, high organic debris, increased temperature of the water, and increased ammonia levels.
It is characterized by the presence of large numbers of filamentous bacteria on the gills accompanied by fusing and clubbing of the gill filaments.