How to Identify Sleepy Cod

To identify Sleepy Cod (Oxyeleotris lineolata), look at these key features.

Physical Characteristics

Body shape

elongated

Coloration

Variable, typically mottled brown, grey, or olive-green on the dorsal surface, fading to a lighter, often yellowish or whitish belly. Distinctive dark, irregular blotches or lines are often present on the body and fins. A prominent dark stripe or series of spots often runs from the snout through the eye to the operculum.

Scale type

ctenoid

Mouth position

terminal

Distinctive features

Large, broad head with a wide mouth, Robust, cylindrical body tapering towards the caudal fin, Two distinct dorsal fins, Large, fleshy lips, Small, embedded scales, Prominent lateral line

Dorsal fin

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

Tail fin

Rounded to slightly emarginate caudal fin.

Pectoral fin

Large and rounded pectoral fins.

Distinctive fins

Pelvic fins are separate and located beneath the pectoral fins, not fused into a disc as in true gobies.

Identification Tips

1. 1

   Body Shape and Size

   Look for a large, robust, and somewhat 'chunky' fish with a broad head. Adults can reach impressive sizes, up to 50 cm (20 inches) or more.

2. 2

   Coloration and Pattern

   Observe the mottled brown/grey/olive body with irregular dark blotches. A key identifier is the dark stripe or series of spots running through the eye.

3. 3

   Dorsal Fins

   Note the two distinct dorsal fins, with the first being spiny and the second soft-rayed. They are clearly separated, unlike some other gudgeons.

4. 4

   Mouth and Lips

   The large mouth with fleshy lips is characteristic of this ambush predator.

5. 5

   Pelvic Fins

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

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