Home / Fishes / Pufferfish / Dwarf pufferfish
No federal permit to keepDwarf pufferfish
Carinotetraodon travancoricus
Fishes › Pufferfish (Tetraodontiformes) › Tetraodontidae (Pufferfish)
The dwarf pufferfish (Carinotetraodon travancoricus), also known as the Malabar pufferfish, pygmy pufferfish, or pea pufferfish, is a small freshwater pufferfish endemic to Kerala and southern Karnataka in Southwest India.
Care at a glance
Species-specific values
Values researched for this exact species. Where they differ from the group guide below, follow these. Air, surface and water temperatures are listed separately, and each source is kept as published rather than averaged.
| Water temperature | 72–82 °F (22–28 °C) Seriously Fish aquarium recommendation; not a wild collection measurement. | 277 |
| Water pH | 6.8–8 pH Seriously Fish aquarium recommendation; not a wild collection measurement. | 277 |
| Water general hardness | 5–25 dGH Seriously Fish aquarium recommendation; not a wild collection measurement. | 277 |
| Maximum standard length | 25 mm SL Source maximum; not total length or a guaranteed adult size. | 277 |
| Water type | freshwater | 277 |
| Diet | Small live/frozen invertebrates; dried foods are often refused. Verify individual feeding success. | 277 |
Species-specific aquarium care
- Tank: At least 24 in long and 12 in front to back for one adult (adults commonly reach about 1.4 in / 3.5 cm).
- Water: Freshwater.
- Temperature: 72–82°F (range recorded for this species).
- pH: 7.5–8.3.
- Layout: Lives on or near the bottom: floor space and hiding places matter more than height.
Calculated from this species' own FishBase record: tank size from its typical adult length and swimming zone, water values from its recorded ranges. The group guide below fills in general care.
Care guide
Species care notes
- Water: a fairly wide range, from slightly acidic to slightly alkaline, 72–82 °F, pH 6.8–8, 5–25 dGH.
- Difficulty: Beginner (Seriously Fish rating).
Short excerpts from the species profile:
- Setup: “This species fares best in a heavily-planted setup, perhaps further decorated with twisted roots and branches to provide additional cover.”
- Diet: “As is the case with most puffers, this species relishes all kinds of shellfish, as well as worms and other live and frozen foods.”
- Tankmates: “Not usually recommended for the community tank, as it tends to nip the fins of slow-moving or long-finned fish.”
- Breeding: “Unlike many of its relatives, C.”
From the Seriously Fish profile for this species, which has the full habitat, maintenance, diet, behaviour and breeding write-up 167
Pufferfish
Applies to most species in this group. Habitat: Pufferfish inhabit marine reefs and coastal waters, brackish estuaries and, in some lineages, freshwater rivers and lakes. Individual species can differ, so compare with the species numbers above and the linked sources.
Housing & setup
- Identify species and salinity needs before setup: Tetraodon mbu needs freshwater, Arothron and Canthigaster need marine systems, and green-spotted puffers need a separate salinity plan.
- For adult T. mbu, the cited profile specifies about 240 × 90 × 90 cm (96 × 36 × 36 in), approximately 1,944 litres.
- Marine Canthigaster require around 150 litres; Arothron meleagris require an absolute minimum around 500 litres, preferably twice that; giant species require larger facilities.
- Provide strong biological filtration and regular waste removal; large marine puffers also require effective mechanical filtration and protein skimming.
- Provide rocks, caves and open swimming room, and protect cables and breakable equipment from their beaks.
Climate & lighting
| Water | 75–79°F |
Diet
- Snails and hard-shelled molluscs such as mussels or cockles for shell-crushing species.
- Shell-on crustaceans or crab legs sized to the fish.
- For Canthigaster, small portions of chopped prawn, frozen Mysis and algal foods.
Social life
- Keep T. mbu alone: it can severely injure other fish and is aggressive to conspecifics. Marine tobies commonly nip trailing fins; puffers can consume aquarium invertebrates. Assess compatibility by species and individual.
Handling
- Never deliberately induce inflation.
- Keep fingers and vulnerable equipment away from the beak.
Health watch
- Overgrown teeth interfering with feeding.
- Overfeeding and diet-related health problems.
- Water-quality illness associated with heavy waste production.
Understanding the animal
About this animal
About this animal
They are popular in aquaria for their bright colours and small size. At a maximum total length of 3.5 cm, dwarf pufferfish are one of the smallest pufferfish in the world.
Quoted from the Wikipedia article “Dwarf pufferfish” (CC BY-SA 4.0) 174
In the wild
In the wild
From this species’ own FishBase record (habitat, bottom type, water and breeding data), not its family. Good care copies these conditions.1
| Where it lives | Lives in freshwater, in rivers and streams. Stays near the bottom. Reaches less than 2.5 cm TL. Probably one of the endangered species. Maximum length of 15 cm TL inis erroneous; length needs better source (RF). |
| Water it lives in | Freshwater, 72–82 °F (22–28 °C), pH 7.5–8.3. |
| Climate | Tropical climate. |
| Behavior to plan for | Breeding: open water/substratum egg scatterers. |
What this means for care
- Keep water within its wild range, 72–82 °F.
Native climate (measured)
Native climate (measured)
| Warm-season highs | about 92°F (up to 93°F in the hottest sampled areas) |
| Cool-season lows | about 71°F (down to 61°F in the coldest sampled areas) |
| Average temperature | 77–82°F across sampled records |
| Relative humidity | 74–78% on average (driest month about 67%) |
| Rainfall | about 2993 mm a year, with strong wet and dry seasons |
Measured at 10 wild occurrence records sampled against WorldClim 2.1 climate data (1970–2000 averages). Air conditions in the range are ecological context, not enclosure settings: microhabitats such as burrows, leaf litter or basking rocks can be cooler, warmer or more humid.
From the sources
From the sources
Quoted from the matching sections of reputable sources for this exact species. Specialist databases are used first; Wikipedia (community-edited, CC BY-SA 4.0) only fills gaps. Other sources are short credited quotes.
| Overview | The dwarf pufferfish (Carinotetraodon travancoricus), also known as the Malabar pufferfish, pygmy pufferfish, or pea pufferfish, is a small freshwater pufferfish endemic to Kerala and southern Karnataka in Southwest India. They are popular in aquaria for their bright colours and small size. At a maximum total length of 3.5 cm, dwarf pufferfish are one of the smallest pufferfish in the world. They closely resemble the related Carinotetraodon imitator, and the two can be difficult to distinguish. — Wikipedia (community-edited) |
| Where it lives | Home ranges Population dynamics Growth parameters Max. ages / sizes Length-weight rel. Length-frequencies Mass conversion Recruitment Abundance Life cycle Reproduction Maturity Maturity/Gills rel. — FishBase |
| Wild diet | Dwarf pufferfish are euryphagous carnivores in that they consume a wide variety of animals. Dwarf pufferfish favour insect larvae but will rely on crustaceans and annelids as alternate feed when the availability of preferable prey decreases. — Wikipedia (community-edited) |
| Reproduction | Eggs are deposited and thus hidden in vegetation. — FishBase |
| Appearance and size | The maximum documented size is 3.5 cm total length (TL), with individuals typically reaching less than 2.5 cm TL, making dwarf pufferfish one of the smallest pufferfish in the world. Both sexes are primarily greenish-yellow, with dark green to brown-black iridescent patches on the flanks and dorsal surface. Patterns and colouration vary considerably between individuals. — Wikipedia (community-edited) |
| Biology | Reaches less than 2.5 cm TL. Probably one of the endangered species. Maximum length of 15 cm TL in is erroneous; length needs better source (RF). — FishBase |
| History and naming | The dwarf pufferfish was first described as Tetraodon (Monotretus) travancoricus in 1941 by S.L. Hora and K.K. Nair, with the type locality given as "Pamba River, Central Travancore". The use of parentheses indicates Monotretus is the subgenus of Tetraodon. — Wikipedia (community-edited) |
| Conservation | Several researchers have considered the species endangered, though with no rationale provided. The dwarf pufferfish is officially classified as vulnerable on the IUCN Red List due to declining populations because of damming, indiscriminate deforestation for agriculture, pollution from wastewater, and, primarily, overfishing for the aquarium trade. — Wikipedia (community-edited) |
Data and studies
The numbers
The numbers
Each bar is what one source reports. Where several sources weigh in, the dashed gold band marks their average.
Adult length
Maximum recorded length. Measured as total length. Fish in home aquariums often stay smaller than wild records.
Water temperature
Range the species tolerates in nature; aim for the middle.
Water hardness
Veterinary & husbandry research
Veterinary & husbandry research
- Complete mitochondrial genome of the vulnerable malabar pufferfish Carinotetraodon travancoricus (Tetraodontiformes, Tetraodontidae) Liu B et al., Mitochondrial DNA. Part B, Resources 2018
- Embryonic development of the world's smallest puffer fish, Carinotetraodon travancoricus - a threatened freshwater fish of the Western Ghats Biodiversity Hotspot Chandana BL et al., Zygote (Cambridge, England) 2024
Peer-reviewed papers that mention this species alongside captivity, zoos, veterinary care or aquaculture. Some cover several species or mention it only in passing, so check the abstract. 170
Sources for this sheet
- FishBase (Froese & Pauly, eds.), version 24.07 Peer-reviewed researchThe global scientific database on fishes, maintained by a consortium of research institutions; every value is referenced.
- Seriously Fish species profiles Experienced keeper or breederLong-running aquarium reference written and peer-checked by experienced fishkeepers and ichthyologists; each profile covers habitat, tank size, water, diet, behaviour and breeding.
- Seriously Fish — tetraodon mbu Experienced keeper or breederAdded in the 2026 source-checked care-guide review.
- Seriously Fish — tetraodon nigroviridis Experienced keeper or breederAdded in the 2026 source-checked care-guide review.
- Practical Fishkeeping — Marine puffer fish: The inflation great! Experienced keeper or breederAdded in the 2026 source-checked care-guide review.
- Practical Fishkeeping — Pufferfish: Inflated egotists Experienced keeper or breederAdded in the 2026 source-checked care-guide review.
- Natural History Museum — Pufferfish: An underwater balloon of death? Experienced keeper or breederAdded in the 2026 source-checked care-guide review.
- Merck Veterinary Manual — Disorders and Diseases of Fish Zoo, university or veterinaryAdded in the 2026 source-checked care-guide review.
- Wikipedia (species article) Community referenceFree encyclopedia; useful overviews with their own citations. Intro text is quoted under CC BY-SA 4.0.
- PubMed (U.S. National Library of Medicine) Peer-reviewed researchIndex of peer-reviewed veterinary, zoo and husbandry research.
- iNaturalist (captive observations) Community referenceCommunity observation platform run by the California Academy of Sciences and National Geographic; observations marked captive show animals living in homes, zoos and aquariums.
More pufferfish
Amazon puffer
Colomesus asellus
Aquarium hobby
Banded puffer
Colomesus psittacus
Aquarium hobby
Congo pufferfish
Tetraodon miurus
Aquarium hobby
Fahaka pufferfish
Tetraodon lineatus
Aquarium hobby
Mbu pufferfish
Tetraodon mbu
Aquarium hobby
Redline pufferfish
Tetraodon pustulatus
Aquarium hobby