Lake Erie is home to one of the world's largest freshwater commercial fisheries. Lake Erie's fish populations are the most abundant of the Great Lakes, partially because of the lake's relatively mild temperatures and plentiful supply of plankton, which is the basic building block of the food chain. The lake's fish population accounts for an estimated 50% of all fish inhabiting the Great Lakes. The lake contains steelhead, walleye (known in Canada as pickerel), largemouth bass, smallmouth bass, perch, lake trout, king salmon, whitefesh, smelt, and many others. The lake consists of a long list of well established introduced species. Common non-indigenous fish species include the rainbow smelt, alewife, white perch and common carp. Non-native sport fish such as rainbow trout and brown trout are stocked specifically for anglers to catch. Attempts failed to stock coho salmon, and its numbers are dwindling. Commercial landings are dominated by yellow perch and walleye, with substantial quantities of rainbow smelt and white bass also taken. Anglers target walleye and yellow perch, with some effort directed at rainbow trout.