How to Identify Senegal Bichir

To identify Senegal Bichir (Polypterus senegalus), look at these key features.

Physical Characteristics

Body shape

eel-like

Coloration

Typically olive-green to gray-brown dorsally, fading to a lighter, often yellowish or whitish ventral side. Some individuals may exhibit faint banding or spotting, especially when young. The coloration provides excellent camouflage in their natural murky habitats.

Scale type

ganoid

Mouth position

terminal

Distinctive features

Elongated, cylindrical body, Rhombic ganoid scales (hard, bony, non-overlapping), A series of 8-11 distinct dorsal finlets, each with a spine and soft rays, Pectoral fins are fleshy and paddle-like, located just behind the operculum, Ventral mouth with small, sharp teeth, External nostrils on a short tube, Paired ventral lungs for air breathing

Dorsal fin

Composed of 8-11 separate, spiny finlets, each independently movable.

Tail fin

Rounded and symmetrical (diphycercal), appearing almost continuous with the body.

Pectoral fin

Fleshy, lobed, and paddle-like, used for propulsion and maneuvering.

Distinctive fins

The series of dorsal finlets is the most defining characteristic of the genus Polypterus.

Identification Tips

1. 1

   Dorsal Finlets

   Count the number of individual dorsal finlets. Polypterus senegalus typically has 8-11 finlets, which is a key distinguishing feature from other bichir species.

2. 2

   Body Coloration and Pattern

   Observe the overall body color (gray to olive-brown) and the absence of prominent dark bands or spots, especially in adults. Juveniles may show faint patterns.

3. 3

   Pectoral Fins

   Note the fleshy, paddle-like pectoral fins, characteristic of all bichirs.

4. 4

   Snout Shape

   The snout is relatively short and blunt compared to some other Polypterus species.

5. 5

   Size

   Adults typically reach 30-50 cm (12-20 inches) in length, making them one of the smaller bichir species.

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