Esocid Lymphosarcoma

Esocid lymphosarcoma is a tumor found in Northern Pike and Muskellunge in North America and Europe. It is described as an infectious disease of probable viral origin. External signs of tumors include protruding growths on the flank, fins, and head that are several centimeters in diameter and have irregular surfaces. Tumors can also occur on internal organs including muscle, kidney, liver, and heart. The color of the tumor can be whitish-gray, red or pink. The tumors are very soft and upon maturity can rupture and appear as dead tissue.