Lake whitefish

The lake whitefish (Coregonus clupeiformis) is a species of freshwater whitefish from North America. Lake whitefish are found throughout much of Canada and parts of the northern United States, including all of the Great Lakes. The lake whitefish is sometimes referred to as a "humpback" fish due to the small size of the head in relation to the length of the body. It is a valuable commercial fish, and also occasionally taken by sport fishermen. Smoked, refrigerated, vacuum-packed lake whitefish fillets are available in North American grocery stores. Other vernacular names used for this fish include Sault whitefish, gizzard fish, common whitefish, eastern whitefish, Great Lakes whitefish, humpback whitefish, inland whitefish and whitefish. The scientific genus name Coregonus (co-regg'-on-us) means "angle eye" in Greek and the species name clupeiformis means "herring-shaped" in Latin.

Description

Lake whitefish are similar in appearance to other whitefishes in the Coregoninae subfamily of the salmon family Salmonidae, such as the northern cisco (Corgenous artedi). As with all salmonids, they have an adipose fin. To the distinction from cisco, the lake whitefish has a snout which overhangs the short lower jaw, so that the mouth opens in a slightly inferior position. Thus the fish can feed on the bottom of lake beds or grab food particulates out of the water or from the surface of a water body. The cisco in turn has a short snout with a lower jaw that extends beyond the snout. Both the cisco and lake whitefish are discernible from the mooneye due to the small posterior dorsal adipose fin. Another notable feature of the lake whitefish is the presence of two small flaps in each nostril. Their coloration is typically silver to white with an olive to pale-green or brown dorsal hues. The ventral fins are white and the tail has a dark posterior edge. The tail fin of the lake whitefish is severely forked, making it a fast swimmer.