freshwater
Northern Snakehead
Channa argus
Elongated, cylindrical body with a long dorsal fin running most of the back and an anal fin of similar length. Large, flattened head resembling that of a snake, with a large mouth full of sharp teeth. Coloration is typically mottled brown, tan, and dark blotches along the flanks, providing camouflage.…
- Habitat
- Native to freshwaters of China, Russia, and the Korean P…
- Size & weight
- Typically grows between 30 to 85 centimeters in length,…
- Diet
- Strictly carnivorous. Juveniles feed on zooplankton, sma…
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Physical characteristics
Elongated, cylindrical body with a long dorsal fin running most of the back and an anal fin of similar length. Large, flattened head resembling that of a snake, with a large mouth full of sharp teeth. Coloration is typically mottled brown, tan, and dark blotches along the flanks, providing camouflage. Scales are cycloid and cover the body and head.
Habitat & distribution
Native to freshwaters of China, Russia, and the Korean Peninsula. Prefers stagnant, shallow ponds, swamps, muddy slow-moving streams, and vegetated lakes. Highly tolerant of low oxygen environments due to a suprabranchial organ allowing air breathing.
Behavior
Solitary or paired ambush predator. Territorial during the breeding season. Capable of surviving out of water for extended periods and crawling across damp land to find new bodies of water.
Diet
Strictly carnivorous. Juveniles feed on zooplankton, small insects, and microcrustaceans. Adults feed primarily on other fish, frogs, small reptiles, and occasionally small mammals or birds.
Reproduction
Serial spawners forming monogamous pairs. They build shallow nests in dense aquatic vegetation. Both parents aggressively guard the eggs and the dense school of fry until they reach several centimeters in length.
Ecological role
Apex freshwater predator that occupies a high trophic level, exerting significant top-down pressure on native fish populations and aquatic invertebrates in introduced ranges.
Similar species
Native bowfin (Amia calva) and burbot (Lota lota). The bowfin has a rounded tail, a short dorsal fin, and a gular plate between the lower jaw bones, whereas the northern snakehead has an extremely long dorsal fin and lacks the gular plate.
Identification tips
Look for the extremely long dorsal fin, snake-like flattened head with large scales, dark blotchy lateral pattern, and absence of spines in the fins.
Interesting facts
Northern snakeheads can breathe atmospheric air using a primitive lung-like organ, enabling them to survive in oxygen-depleted waters and migrate overland across wet ground.