How to Identify Marbled Lungfish

To identify Marbled Lungfish (Protopterus aethiopicus), look at these key features.

Physical Characteristics

Body shape

eel-like

Coloration

Dorsal surface is typically dark grey to olive-brown, often with irregular dark spots or blotches, giving it a marbled appearance. The ventral surface is lighter, ranging from cream to light grey. Juveniles may exhibit more pronounced patterning.

Scale type

cycloid

Mouth position

terminal

Distinctive features

Elongated, cylindrical, eel-like body, Two highly developed, lung-like swim bladders (modified lungs), Paired, filamentous, limb-like fins, Small, embedded cycloid scales, Ability to aestivate in mud cocoons

Dorsal fin

Continuous, low dorsal fin extending along most of the back, merging with the caudal and anal fins.

Tail fin

Diphycercal (symmetrical, tapering to a point), continuous with dorsal and anal fins.

Pectoral fin

Long, slender, filamentous, and limb-like, positioned low on the body.

Distinctive fins

Pelvic fins are also long, slender, and filamentous, similar to pectorals but shorter, positioned abdominally.

Identification Tips

1. 1

   Body Shape and Size

   Look for a very long, snake-like or eel-like body, which can reach impressive lengths of up to 2 meters (6.6 feet) and weigh over 50 kg (110 lbs), though typically smaller.

2. 2

   Coloration

   Observe the marbled pattern of dark spots or blotches on a grey to olive-brown background, especially on the dorsal side.

3. 3

   Fins

   Identify the distinctive, long, filamentous, and limb-like pectoral and pelvic fins, which are unique among most fish.

4. 4

   Breathing Behavior

   In aquariums or shallow wild waters, observe it surfacing to gulp air, a clear indication of its lung-breathing capability.

Explore Marbled Lungfish