What does Tonsillitis affect? What kinds of animals are #1 found in? Are fish #2?
Tonsillitis
Tonsils are a pair of soft tissue masses located at the rear of the throat Tonsillitis is the inflammation of tonsils. Fish do not have tonsils. Tonsils are only found in mammals. 
Inflammation of the tonsils
Can fish get Tonsillitis?