Common name: Lake Trout (Laker)

Scientific name: Salvelinus namaycush

Description:
From a zoological perspective, lake trout are quite rare. They are native only to the northern parts of North America, principally Canada but also Alaska and, to some extent, the northeastern United States.

Lake trout are the largest of the charrs, the record weighing almost 46.3 kg (102 lb). Lake trout inhabit cold, oxygen-rich waters. They are pelagic during the period of summer stratification, often living at depths of 20–60 m (60–200 ft).

The lake trout is a slow growing fish and very late to mature. Populations are extremely susceptible to overexploitation.

Northern Pike

Common name: Northern Pike

Scientific name: Esox lucius

Description:
The northern pike (known simply as a pike in Britain, Ireland, or as jackfish in Canada and in the United States of America), is a species of carnivorous fish of the genus Esox (the pikes). They are typical of brackish and freshwaters of the northern hemisphere.

Northern pike are most often olive green, shading into yellow to white along the belly. The flank is marked with short, light bar-like spots and there are a few to many dark spots on the fins. Sometimes the fins are reddish. Younger pike have yellow stripes along a green body, later the stripes divide into light spots and the body turns from green to olive green. The lower half of the gill cover lacks scales and they have large sensory pores on their head and on the underside of the lower jaw which are part of the lateral line system.

Pike grow to a relatively large size; lengths of 150 centimetres (59 in) and weights of 25 kilograms (55 lb) are not unheard of.

Pike are found in sluggish streams and shallow, weedy places in lakes, as well as in cold, clear, rocky waters. Pike are typical ambush predators; they lie in wait for prey, holding perfectly still for long periods and then exhibit remarkable acceleration as they strike.

Arctic Grayling

Common name: Arctic Grayling

Scientific name: Thymallus arcticus

Description:
Arctic grayling is a species of freshwater fish in the salmon family (family Salmonidae) of order Salmoniformes. It comprises five subspecies and is widespread throughout the Arctic and Pacific drainages in Canada, Alaska, and Siberia, as well as the upper Missouri River drainage in Montana.

It grows to an average length of 12-15 in and weighs in at 1-3 lbs. A strikingly coloured fish, the back is purple to blue-black or blue-grey with sides of a pinkish iridescence having a number of V-shaped or diamond shaped spots. The head is olive-green with a mauve iridescence. During spawning the colors darken and the male becomes more brilliant than the female.

Several life history forms of Arctic grayling occur: fluvial populations that live and spawn in rivers;  lacustrine populations that live and spawn in lakes; and potamodromous populations that live in lakes and spawn in tributary streams.

Lake Whitefish

Common name: Lake Whitefish

Scientific name: Coregonus clupeaformis

Description:
The lake whitefish is a species of freshwater whitefish from North America. They are found throughout much of Canada and parts of the northern United States of Minnesota and Michigan, including the Great Lakes. A valuable commercial fish, whitefish are also occasionally taken by sport fishermen.

Their colouration is olive-green to blue on the back, with silvery sides. They have a small mouth below a rounded snout, and a deeply forked tail. On average, they reach 18". They are found in freshwater lakes where they prefer deep, cool water.

Lake whitefish spawn from September through January in water two to four metres in depth.

Burbot

Common name: Burbot

Scientific name: Lota Lota

Description:
The burbot is the only gadiform (cod-like) fish inhabiting freshwaters. It is also known as mariah, the lawyer, and (misleadingly) eelpout. It is closely related to the marine common ling and the cusk. It is the only member of the genus Lota.

The genus and species name "lota" comes from the old French "lotte", fish named also "barbot" in this language.