Extant jawless fish are either lamprey or hagfish. Fish species include Chinook salmon, rainbow trout, Coho salmon, Pacific lamprey, and coastal cutthroat trout. Other examples of anadromous fishes are sea trout, three-spined stickleback, sea lamprey and shad. Hagfish and lamprey kidneys are unusually simple. Native species include allis shad, brown trout, European eel and river lamprey. Native fish include Chinook Salmon, Steelhead, Redband Trout, Coho Salmon, Bull Trout, and Pacific Lamprey. Smaller pieces became lamprey and hagfish. Invasive species like the alewife and sea lamprey can be found in the Great Lakes. Freshwater fish such as pike, carp, bream, perch, lamprey and trout were common. Burbot are preyed upon by northern pike, muskellunge, and some lamprey species. The channel catfish, lamprey, and sturgeon are among the 400 known freshwater fishes. Freshwater fish such as pike, carp, bream, perch, lamprey, and trout were common. Jawless fishes include brook lamprey, river lamprey, sea lamprey. The sea lamprey has an eel-like body without paired fins.