freshwater
Lake Trout
Salvelinus namaycush
Streamlined, torpedo-shaped body typical of salmonids. Possesses a deeply forked tail fin, unlike many other trout species which have square or slightly notched tails. Dark green to grey or brownish background coloration covered with numerous light-colored spots that extend onto the dorsal and caudal fins.…
- Habitat
- Native to deep, cold freshwater lakes in northern North…
- Size & weight
- Typical adult length ranges from 15 to 30 inches (38 to…
- Diet
- Carnivorous predator feeding primarily on other fish suc…
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Physical characteristics
Streamlined, torpedo-shaped body typical of salmonids. Possesses a deeply forked tail fin, unlike many other trout species which have square or slightly notched tails. Dark green to grey or brownish background coloration covered with numerous light-colored spots that extend onto the dorsal and caudal fins. Lower fins often feature a distinctive white or cream-colored leading edge.
Habitat & distribution
Native to deep, cold freshwater lakes in northern North America, including Canada, the Great Lakes region, and Alaska. Prefers deep, well-oxygenated water layers, typically remaining in the thermocline or hypolimnion during warmer months.
Behavior
Solitary or loose-aggregating fish that are generally active year-round. Strongly influenced by water temperature, migrating to shallower waters in spring and autumn, and retreating to deep, cold abyssal zones in summer and winter.
Diet
Carnivorous predator feeding primarily on other fish such as ciscoes, whitefish, sculpins, and yellow perch, as well as large invertebrates and crustacean zooplankton when young.
Reproduction
Spawns in autumn over shallow, rocky reefs or shoals in lakes. Does not build redds (nests); instead, adhesive eggs are broadcast-spawned and fall into crevices among rocks where they develop unattended through the winter.
Ecological role
Acts as an apex or top-tier predator in deep lake ecosystems, regulating populations of smaller forage fish and maintaining aquatic food web balance.
Similar species
Brook trout (Salvelinus fontinalis), which generally has a square tail, worm-like markings (vermiculations) on the back, and distinct red spots with blue halos, rather than light spots on a dark background.
Identification tips
Look for the deeply forked tail fin, light spots scattered over a dark body, and the absence of black spots on the dorsal fin (distinguishing it from Pacific salmon and brown trout).
Interesting facts
Lake trout are the largest of the char species and are exceptionally long-lived, with some individuals in cold northern lakes living for several decades.