Blue-spotted Shark

The Blue-spotted Bamboo Shark (Chiloscyllium plagiosum) is a small, slender carpet shark in the family Hemiscylliidae, easily recognized by its striking pattern of vivid blue spots over a tan to brown body. Native to shallow coral reef and tide-pool habitats across the Indo-West Pacific, it is a hardy, nocturnal bottom-dweller that has become one of the most popular shark species in the public and home aquarium trade due to its small adult size and tolerance of captivity. In the wild it forages for small invertebrates in reef crevices and sand at night, sheltering in caves or under coral by day. It is generally considered a species of low conservation concern, though it faces localized pressure from the aquarium trade and habitat loss.

Key field marks:

• Slender, elongated body, pale tan to grayish-brown background
• Numerous small, vivid blue spots scattered over the body and fins
• Faint dark brown saddle-like bands across the back, more visible in juveniles
• Small barbels near the nostrils and a small mouth positioned well forward
• Rounded pectoral and pelvic fins, elongated tail without a distinct lower lobe

The dense covering of small blue spots is the most reliable field mark distinguishing it from other bamboo and carpet sharks.

Found across the Indo-West Pacific, including the Indian Ocean coasts of India and Sri Lanka, Southeast Asia, southern China, and Japan. Inhabits shallow coral reefs, reef flats, tide pools, and lagoons, typically at depths under 20 m. Prefers warm tropical water and sheltered reef structure with crevices and coral rubble for daytime refuge, similar to other bamboo sharks.

Blue-spotted Bamboo Sharks are nocturnal, spending daylight hours resting in reef crevices or caves and emerging at night to actively forage for small crustaceans, worms, and fish hidden in sand and coral rubble, using their flexible bodies to probe tight spaces. They are hardy and adaptable, able to tolerate low-oxygen conditions and captivity better than most sharks, which has driven strong demand from aquarists. Reproduction is oviparous, with females laying pairs of egg cases anchored to reef structure that hatch after several months. They are generally solitary and non-aggressive, posing no threat to divers or humans.