Aquarist Atlas
Aquarist Atlas · the freshwater & brackish puffers

Pufferfish

Pufferfish are the aquarium’s great characters — round-bodied, big-eyed, intelligent fish that watch you back, hunt snails with a parrot-like beak, and inflate into a ball when alarmed. A small but devoted set of them live in fresh and brackish water: the thumbnail-sized pea puffer (Carinotetraodon travancoricus) of the Western Ghats, the dragon and hairy puffers (Pao) of the Mekong, the brackish green spotted puffer (Dichotomyctere nigroviridis) of Southeast Asian estuaries, the Nile Fahaka and the three-quarter-metre Mbu (Tetraodon) of Africa, and the lively Amazon puffer (Colomesus asellus) — the only true-freshwater puffer of the New World. They are not beginner community fish, and this section is honest about why: it is built to the same standard as the cichlid, cory and pleco pages, with no Wikipedia and no invented facts.

© Adobe Stock

This section covers the freshwater and brackish pufferfish of the family Tetraodontidae — the ones kept in aquaria — and deliberately leaves out the far larger set of purely marine puffers, as well as the porcupinefish and boxfish. The taxonomy is in active flux: the old worldwide genus Tetraodon has been split, so that Tetraodon now holds only the African species, while the Asian ones moved to Dichotomyctere, Pao and Leiodon. We follow the Catalog of Fishes for valid names, so a fish you know as a “Tetraodon” may appear here under its current genus.

Puffers are not a generic small-fish family, and we do not write them as one. Their breeding is not uniform — some scatter eggs and walk away, but many, including the dwarf puffers, several Pao, and Leiodon, have the male guard the eggs. Their care is genuinely distinctive: a beak of four fused teeth that never stops growing and must be worn down on hard-shelled food (snails, shellfish); a temperament that is mostly aggressive and predatory, so many are best kept alone; a need for brackish water in the green spotted and figure-eight puffers; no scales and no true gill covers, which makes them acutely sensitive to medication (never copper); the famous inflation defence; and the tetrodotoxin in their tissues. We lean into all of it.

A Mbu puffer, its flank covered in an intricate maze of yellow lines on dark olive, cruising past rocks and plants
The Mbu (Tetraodon mbu) is among the largest freshwater puffers — three-quarters of a metre of intelligent, maze-patterned muscle from the Congo. Tetraodon is now an African-only genus: the old worldwide catch-all was split, sending the Asian puffers into Dichotomyctere, Pao and Leiodon.
A green spotted puffer, vivid yellow-green above with bold black spots and a white belly, among fine plants
The green spotted puffer (Dichotomyctere nigroviridis) — the “GSP” — is the classic brackish puffer: it needs salt, and drifts toward near-marine water as it grows. Bright, bold and aggressive, it is a fish that wears no scales and tolerates no copper.
A green spotted puffer working at a hard-shelled morsel near the substrate, its beak visible
Every puffer carries a beak of four fused teeth that never stops growing — so it must crush hard-shelled food, snails and shellfish, to keep the beak worn down. Skip the hard food and the beak overgrows until it has to be trimmed by hand. The beak, the aggression and the tetrodotoxin are what set puffers apart.

Photos © Adobe Stock

33 species in the atlas

We cover the freshwater and brackish puffers kept in the hobby, grouped here by a friendly region-and-kind axis — the dwarf puffers, the Southeast Asian river puffers, the brackish estuary puffers, the African puffers and the South American puffers — rather than by raw genus. Marine puffers, porcupinefish and boxfish are out of scope. Following the Catalog of Fishes and FishBase, accounts are added as they are researched.

Species

33 of 33 species

Dwarf puffers · 6

The dwarf or pea puffers (Carinotetraodon) — the smallest of all puffers, from the pea puffer of the Western Ghats to the red-eye dwarfs of Sundaland. Pure-freshwater nano fish and the only puffers regularly kept in a group, though still snail-hunters armed with the family's beak. Several are strikingly dimorphic, and the male guards the eggs among plants.

SE Asian puffers · 11

The river puffers of the Mekong and mainland Asia (Pao, plus the ocellated Leiodon cutcutia) — freshwater ambush predators of Indochina's rivers and floodplains, from the dragon and hairy puffers to the arrowhead. Mostly solitary, predatory, and best kept alone; the males of several species guard the eggs on the bottom.

Brackish puffers · 7

The brackish estuary puffers (Dichotomyctere — the green spotted 'GSP' and the figure-eight — and the golden Auriglobus) of Southeast Asian mangroves and tidal rivers. These need salt: the GSP drifts toward near-marine water as it grows. Aggressive, fin-nipping fish, best kept alone or with great care.

African puffers · 6

The African puffers (Tetraodon, now an African-only genus after the old global Tetraodon was split up). The Fahaka of the Nile, the giant Mbu of the Congo — among the largest freshwater puffers at three-quarters of a metre — and the spotted Congo puffers. Powerful, intelligent and aggressive; the big species need very large tanks.

South American puffers · 3

The South American puffers (Colomesus) — the lively, shoaling Amazon puffer, the only true-freshwater puffer of the New World, and its brackish estuary relatives. Busy and active, but incorrigible fin-nippers that test even an experienced keeper's stocking plan.

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