Mbu Pufferfish Identification Guide

Key identification features

• Largest freshwater pufferfish species, capable of reaching up to 67 cm (26 in)
• Grayish to olive-brown back marked with a dark, maze-like or wavy labyrinth pattern
• Pale cream to white belly with no strong markings
• Large rounded head and prominent, expressive eyes that seem to track passing objects
• Thick, heavy-bodied build that appears almost spherical when inflated
• No pelvic fins, using pectoral, dorsal, and anal fins for slow, deliberate swimming

Common look-alikes

• Fahaka pufferfish (Tetraodon lineatus): shows bold yellow stripes running along the body rather than the Mbu's wavy maze pattern, and stays notably smaller overall.
• Other large Tetraodon species: generally smaller at maturity and lack the distinctive labyrinthine back markings.

Where you'll see one

Native to the Congo River basin and associated lakes in Central Africa, inhabiting deep, slow-flowing river channels and calm backwaters. It prefers areas with structure such as sunken wood or dense vegetation, patrolling slowly along the bottom while hunting snails, crustaceans, and other invertebrates.