How to Identify Northern Snakehead

To identify Northern Snakehead (Channa argus), look at these key features.

Physical Characteristics

Body shape

eel-like

Coloration

Typically dark brown to golden tan on the dorsal side, fading to a lighter belly. Distinctive blotchy, dark brown to black markings along the flanks, often forming a snake-like pattern. Fins are generally mottled.

Scale type

cycloid

Mouth position

superior

Distinctive features

Long dorsal fin extending almost the entire length of the back (49-54 rays), Long anal fin (32-38 rays), Large mouth with sharp, canine-like teeth on both jaws and the roof of the mouth, Protruding lower jaw, Absence of pelvic fins in some closely related snakehead species, but present in Channa argus, Large, cycloid scales covering the head and body, resembling a snake's head, Suprabranchial organ for air breathing

Dorsal fin

Single, very long dorsal fin, typically with 49-54 soft rays, extending from behind the pectoral fins almost to the caudal fin.

Tail fin

Rounded caudal fin.

Pectoral fin

Rounded pectoral fins, typically with 15-17 rays.

Distinctive fins

Anal fin is also long, with 32-38 soft rays, similar in appearance to the dorsal fin but shorter. Pelvic fins are present and small, located abdominally.

Identification Tips

1. 1

   Body Shape

   Elongated, cylindrical, snake-like body.

2. 2

   Head

   Large, flattened head with large scales, resembling a snake's head. Large mouth with a protruding lower jaw.

3. 3

   Fins

   Very long dorsal and anal fins without spines. Rounded caudal fin. Pelvic fins are present.

4. 4

   Coloration

   Mottled brown and tan pattern, often with dark blotches along the sides.

5. 5

   Air Breathing

   Frequently surfaces to gulp air, especially in low-oxygen environments.

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