Although Clostridium perfringens Type B is not considered a significant problem in the U.S.A., immunity may be provided against the beta and epsilon toxins elaborated by Cl. perfringens Type B. The immunity is derived from the combination of Type C (beta) and Type D (epsilon) fractions.
What do sea lampreys eat? A: Sea lampreys feed off the blood of large fish, including trout, salmon, whitefish, carp, catfish and sturgeon. The sea lamprey is native to the Atlantic Ocean but infiltrated the Great Lakes region in the 1920s and '30s during canal construction.
What Do They Eat? Larval yellow perch commonly eat copepods, waterfleas, and other small crustaceans. Juveniles quickly begin to include bigger items such as aquatic insect larvae and larval fish. By the end of their first growing season, perch are including small fish, crayfish, leeches, and snails in their diet.