“Puffer fish” covers about 200 species in the family Tetraodontidae plus a handful of look-alikes from neighbouring families that the trade sells under the same name. Around thirty live in fresh or brackish water; the rest are marine. This page lists the species you will actually meet in a shop, what they really need, and which trade names hide which fish.
Freshwater Puffer Fish Species
These are true freshwater puffers — they live their whole lives without added salt. Everything else marketed as a “freshwater puffer” is brackish and will decline in plain fresh water.
| Common name | Scientific name | Adult size | Minimum tank | Temperament |
|---|---|---|---|---|
| Pea / dwarf / Indian dwarf puffer | Carinotetraodon travancoricus | 1–1.4 in | 10 gal (trio) | Territorial, fin-nipper |
| Red eye puffer | Carinotetraodon irrubesco | 2 in | 15 gal | Mildest of the small puffers |
| Amazon / South American / bee puffer | Colomesus asellus | 3–3.5 in | 30 gal (group of 5+) | Shoaling, hyperactive nipper |
| Avocado / bronze puffer | Auriglobus modestus | 4–5 in | 40 gal | Fast, highly aggressive |
| Congo / potato puffer | Tetraodon miurus | 6 in | 40 gal | Ambush predator, solitary |
| Hairy puffer | Pao baileyi | 6 in | 55 gal | Ambush predator, solitary |
| Fahaka / Nile / lineatus puffer | Tetraodon lineatus | 16–18 in | 125 gal | Solitary, dangerous to tank mates |
| Mbu / giant puffer | Tetraodon mbu | 24–30 in | 500+ gal | Solitary specimen fish |
Care detail for the freshwater group is on the freshwater puffer fish page.
Brackish Puffer Fish Species
Brackish puffers are the most commonly mis-sold fish in the hobby, because juveniles look fine in freshwater shop tanks for months before the damage shows.
| Common name | Scientific name | Adult size | Salinity target | Minimum tank |
|---|---|---|---|---|
| Figure 8 puffer | Dichotomyctere ocellatus | 3 in | SG 1.005–1.008 lifelong | 15–20 gal |
| Green spotted puffer | Dichotomyctere nigroviridis | 6 in | SG 1.005 juvenile → 1.018–1.022 adult | 30 gal |
| Ceylon / Topaz puffer | Dichotomyctere fluviatilis | 6–7 in | SG 1.005–1.015 | 40 gal |
| Target / arrowhead puffer | Dichotomyctere sp. | 5–6 in | SG 1.005–1.012 | 40 gal |
Saltwater Puffer Fish Species
Marine puffers split into true puffers (Tetraodontidae), the small tobies of the genus Canthigaster, and the porcupinefish of the related family Diodontidae, which the trade sells as puffers too.
| Common name | Scientific name | Adult size | Minimum tank | Reef safe? |
|---|---|---|---|---|
| Valentini / black-saddled toby | Canthigaster valentini | 4 in | 30 gal | No — nips corals and clams |
| Dogface puffer | Arothron nigropunctatus | 12–13 in | 180 gal | No |
| Porcupine puffer | Diodon holocanthus | 12–14 in | 125 gal | No |
| Spiny box / burrfish | Chilomycterus schoepfi | 8–10 in | 100 gal | No |
| Stars and stripes puffer | Arothron hispidus | 18–20 in | 250 gal | No |
Marine care detail is on the saltwater puffer fish page.
Small Puffer Fish for Small Tanks
Only three puffers are genuinely small-tank fish, and only one of them is a beginner fish:
- Pea puffer, 1–1.4 in — 10 gallons for a trio. The only puffer most aquarists should start with. Full care on the pea puffer page.
- Red eye puffer, 2 in — 15 gallons. Less common, less aggressive, slightly fussier about soft acidic water than the pea puffer.
- Figure 8 puffer, 3 in — 15–20 gallons. Small but brackish, so it needs a hydrometer or refractometer and marine salt for life.
Species Notes on Less Common Puffers
Congo puffer (Tetraodon miurus)
A true freshwater ambush predator from the Congo River rapids. It buries itself in fine sand with only the eyes and upturned mouth exposed and takes prey with an explosive lunge. Give it 40 gallons, 3–4 inches of soft sand, strong flow and no tank mates — it will attack fish several times its own length. Colour varies from brick red through orange to grey and shifts with substrate and mood.
Hairy puffer (Pao baileyi)
A Mekong species covered in cutaneous cirri — the “hair” is skin, not algae. Another sit-and-wait predator: it perches on wood in fast water and rarely swims. Wants 55 gallons, high flow, cool-to-moderate temperatures around 75–79°F, and strictly solitary housing. Almost always wild-caught, so a deworming quarantine is standard.
Avocado puffer (Auriglobus modestus)
Also sold as bronze or golden puffer. Unlike most puffers it is a fast open-water swimmer, which makes it both a good display fish and a relentless attacker of anything with fins. Forty gallons minimum with a long footprint, and single-specimen housing.
Red eye puffer (Carinotetraodon irrubesco)
A 2-inch Sumatran and Bornean species with a red tail on the male. It is the closest thing to a peaceful puffer — still not community safe, but a pair can often share 15–20 gallons. Prefers soft, slightly acidic water and dim, heavily planted tanks.
How to Identify Which Puffer You Bought
- Count the spots and check the belly. A bright white belly with black-green spotting on a golden-green back is a green spotted puffer. A brown fish with yellow figure-eight and ring markings is a figure 8.
- Measure it. Under 1.5 inches with a yellow-green body and dark blotches is a pea puffer.
- Look for vertical stripes. Bold yellow-and-brown horizontal striping with an orange belly on a fish already over 3 inches is a fahaka.
- Look at the eyes. Eyes set on top of the head with an upturned mouth means an ambush burrower: congo or hairy puffer.
- Ask for the scientific name. If the shop cannot give one, assume it is brackish and expensive to keep until proven otherwise.
Frequently Asked Questions
How many types of puffer fish are there?
About 200 species are described in the family Tetraodontidae, spread across roughly 29 genera. Around 30 of them live in fresh or brackish water and the rest are marine. Only a dozen or so appear regularly in the aquarium trade.
What types of freshwater puffer fish are there?
The true freshwater puffers kept in aquariums are the pea or dwarf puffer, red eye puffer, Amazon puffer, avocado puffer, congo puffer, hairy puffer, fahaka puffer and mbu puffer. Green spotted and figure 8 puffers are often sold as freshwater but are brackish.
What is the smallest puffer fish?
The pea puffer, Carinotetraodon travancoricus, at 1 to 1.4 inches. It is also called the dwarf puffer or Indian dwarf puffer, and it is the only puffer suited to a 10 gallon tank.
What is the biggest puffer fish you can keep?
The mbu puffer, Tetraodon mbu, reaching 24 to 30 inches. It needs 500 gallons or more, which in practice means a custom tank or an indoor pond. The fahaka puffer at 16 to 18 inches is the largest puffer most people can realistically house.
Is a porcupine puffer a real puffer fish?
Not in the strict sense. Porcupine puffers belong to the family Diodontidae rather than Tetraodontidae, and they have two fused tooth plates rather than four. They inflate the same way and are kept the same way, so the trade groups them with puffers.
Which puffer fish is best for a beginner?
The pea puffer. It stays tiny, lives in ordinary hard freshwater, and a trio is happy in a 10 gallon planted tank. Its only real demand is live and frozen food plus a supply of pest snails to grind its teeth.