How to Identify Slender Bamboo Shark

To identify Slender Bamboo Shark (Chiloscyllium griseum), look at these key features.

Physical Characteristics

Body shape

elongated

Coloration

Adults are typically uniform greyish-brown to dark brown dorsally, often with faint, darker transverse bands or saddles that may fade with age. Ventrally, they are lighter, often off-white. Juveniles often exhibit more pronounced dark banding or spotting, which fades as they mature.

Scale type

placoid

Mouth position

subterminal

Distinctive features

Two prominent dorsal ridges running along the back, from behind the head to the caudal fin origin., Small mouth positioned subterminally., Short barbels on the snout., Large spiracles below the eyes., Five small gill slits, the last two positioned over the pectoral fin origin.

Dorsal fin

Two spineless dorsal fins of approximately equal size. The first dorsal fin originates over the pelvic fin bases. The second dorsal fin is slightly smaller and originates over the posterior half of the anal fin.

Tail fin

Long, low caudal fin without a distinct lower lobe, but with a prominent subterminal notch. The upper lobe is continuous with the body.

Pectoral fin

Broad and rounded pectoral fins.

Distinctive fins

Anal fin present, originating behind the second dorsal fin and terminating just before the caudal fin.

Identification Tips

1. 1

   Body Ridges

   Look for the two distinct, low dermal ridges running along the dorsal surface from the head to the caudal fin. This is a key distinguishing feature from other bamboo sharks.

2. 2

   Coloration

   Adults are generally uniform greyish-brown, lacking the prominent banding often seen in other bamboo shark species like Chiloscyllium punctatum (Brownbanded Bamboo Shark) or Chiloscyllium plagiosum (Whitespotted Bamboo Shark), especially as they mature. Juveniles may have faint bands.

3. 3

   Snout and Mouth

   Observe the relatively short snout with small barbels and the subterminal mouth. The eyes are small and located dorsally.

4. 4

   Fin Origin

   Note the origin of the first dorsal fin, which is typically over the pelvic fin bases, and the anal fin, which is well behind the second dorsal fin.

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