Most cancers and tumors found in fishes have no cure or treatment. Internal tumors or cancers are also not diagnosed until the advanced stages of the disease. And when it is identified early, the position and placement of the tumor often makes it inoperable. This is the main reason most fishes with tumors and cancers are terminated (euthanized).
However, there are some tumors which are treatable. For instance, gill tumor, which is caused by a thyroid problem, can be treated by placing the fish in water medicated with iodine.
A type of neoplasm that occurs in connective tissue
Something that becomes worse or life threatening as it spreads