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Description of Method - Triploid Grass Carp. The grass carp, also known as the white amur, is a vegetarian fish native to the Amur River in Asia. Because this fish feeds on aquatic plants, it can be used as a biological tool to control nuisance aquatic plant growth. In some situations, sterile grass carp may be permitted for introduction into Washington waters.
A: Walleye are piscivores (i.e. fish-eaters) and usually feed on any species of fish that they can catch and swallow, states the University of Minnesota website. They commonly eat yellow perch and various species of minnows and darters. Larval and young walleye eat waterfleas, copepods, small insect larvae and larval fish.