Carinotetraodon travancoricus is the smallest known freshwater pufferfish in the world, a strictly freshwater species endemic to the Western Ghats river systems of Kerala, southern India. At just 2.5 cm maximum, it packs an astonishing amount of personality, intelligence, and aggression into one of the most charming small fish in the hobby. Males develop vivid yellow-green bodies with scattered dark brown to black spots, wrinkled skin when at rest, and bright blue-green eyes that actively track movement. Females are plainer and rounder.
Like all pufferfish, the Pea Puffer has beak-like fused teeth that grow continuously and must be worn down through feeding on hard-shelled prey. In the wild, it feeds on small invertebrates, snails, insect larvae, and similar items. In captivity, a diet of live or frozen snails, bloodworms, daphnia, brine shrimp, and similar hard-shelled or soft invertebrates is essential. Pea Puffers are intelligent and curious, exploring every corner of their tank and visibly tracking their keeper through the glass.
Despite their tiny size, Pea Puffers are aggressive toward other fish, especially slow-moving or long-finned species, and can be problematic in community tanks. They are best kept in species-specific setups or carefully chosen nano communities with fast-moving, robust tankmates. Each individual has a distinct personality, and their interactive behavior makes them extremely popular despite the care requirements.
