How to Identify Snakehead Gudgeon

To identify Snakehead Gudgeon (Giuris margaritacea), look at these key features.

Physical Characteristics

Body shape

elongated

Coloration

Variable, typically mottled brown, grey, or olive green with darker blotches and spots, providing excellent camouflage. The belly is usually lighter. Fins often have faint banding or spotting.

Scale type

ctenoid

Mouth position

superior

Distinctive features

Large, flattened head, giving it a 'snakehead' appearance., Protruding lower jaw., Two distinct dorsal fins, the first with spines and the second with soft rays., Large, ctenoid scales., Eyes positioned dorsally on the head.

Dorsal fin

Two dorsal fins; the first is spiny (VI-VIII spines), the second is soft-rayed (I spine, 8-10 soft rays). The two fins are distinctly separated.

Tail fin

Rounded to slightly emarginate caudal fin.

Pectoral fin

Large, rounded pectoral fins.

Distinctive fins

Pelvic fins are separate and thoracic, not fused into a disc as in true gobies.

Identification Tips

1. 1

   Head Shape

   Look for the distinctly large, flattened head and prominent, slightly upturned mouth, which gives it its 'snakehead' moniker.

2. 2

   Dorsal Fins

   Note the two separate dorsal fins; the first is spiny and shorter, while the second is longer and soft-rayed.

3. 3

   Pelvic Fins

   Unlike true gobies, the pelvic fins are separate and not fused into a suction cup-like disc.

4. 4

   Coloration and Pattern

   Observe the mottled brown, grey, or olive coloration with irregular darker blotches, which aids in camouflage.

5. 5

   Size

   Adults can reach a considerable size, up to 60 cm, which distinguishes them from many smaller gudgeon species.

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