Pea Puffer

Also known as: Carinotetraodon travancoricus

The Pea Puffer (Carinotetraodon travancoricus) is one of the smallest pufferfish species, reaching only about 2.5 cm in length. The Pea Puffer originates from Western Ghats of India, specifically in Kerala and Tamil Nadu, inhabiting slow-moving, densely vegetated freshwater streams, ponds, and paddy fields with soft, acidic water and abundant leaf litter., reaches 2.5 cm in captivity, typically lives 4, and is kept at 24C (75F). Individual fish vary, so treat this as a general guide rather than a guarantee.

Species at a glance

Origin: Western Ghats of India, specifically in Kerala and Tamil Nadu, inhabiting slow-moving, densely vegetated freshwater streams, ponds, and paddy fields with soft, acidic water and abundant leaf litter.
Adult size: 2.5 cm (1.0 in)
Life span: 4
Temperament: Territorial and aggressive, especially males; best kept singly or in very large tanks with ample hiding spaces; not suitable for community tanks due to fin-nipping and predatory behavior.
Tank size: 20 L (5 gal)
Water temp: 24C (75F)
pH range: pH 6.5-7.5
Diet: Carnivorous; requires live or frozen foods such as bloodworms, brine shrimp, daphnia, and small snails (e.g., bladder or ramshorn snails) to wear down continuously growing teeth; avoid flakes or pellets as primary diet.
Other names: Carinotetraodon travancoricus

About the Pea Puffer

The Pea Puffer (Carinotetraodon travancoricus) is one of the smallest pufferfish species, reaching only about 2.5 cm in length. Native to the freshwater systems of southwestern India, it thrives in densely planted, slow-moving waters with soft, slightly acidic conditions. Known for its intelligent and curious behavior, it exhibits complex interactions and can recognize its keeper. Despite its small size, it is highly territorial and requires specific care to thrive in captivity.

Lifespan and health

With optimal care, Pea Puffers typically live 3 to 5 years in captivity, with some individuals reaching up to 6 years under exceptional conditions. Lifespan is heavily influenced by diet, water quality, and stress levels; chronic aggression from tankmates or inadequate dental wear significantly shortens their life. Regular monitoring of behavior, appetite, and physical condition is essential for early detection of issues. Common health issues include overgrown teeth (beak malocclusion) due to lack of hard-shelled prey, which can prevent eating and requires veterinary trimming under anesthesia. They are also prone to bacterial infections (e.g., fin rot, ulcers) from poor water quality or injury, and parasitic infections like ich or velvet if stressed or introduced from unverified sources. Swim bladder disorders may occur from overfeeding or constipation. Quarantine new arrivals for 2–4 weeks, maintain pristine water, and prioritize live snails in the diet to prevent the majority of health problems.

Overview

Care and tank setup

Pea Puffers require a minimum tank size of 20 liters (5 gallons) for a single specimen, though larger tanks (30+ liters / 8+ gallons) are strongly recommended to reduce aggression and provide adequate swimming and hiding space. The tank should be heavily planted with live plants such as Java moss, Anubias, and floating vegetation to mimic their natural habitat and provide cover. Use a soft, fine substrate like sand to prevent injury to their delicate undersides, and include driftwood, caves, or ceramic shelters for territorial boundaries. Filtration should be gentle—sponge filters are ideal—to avoid strong currents that stress these slow-moving fish. Water parameters must be maintained within a narrow range: temperature between 24–26°C (75–79°F), pH 6.5–7.5, and hardness soft to moderately soft (dGH 5–12). Perform weekly water changes of 25–30% to keep nitrates below 20 ppm, as puffers are sensitive to poor water quality. Avoid copper-based medications and ensure all decor is smooth and non-abrasive. Lighting should be moderate to support plant growth without causing stress. Feeding should occur once daily with a variety of live or frozen foods; offer only what they can consume in 2–3 minutes to prevent overfeeding. Snails are essential for dental health—provide 1–2 small snails per feeding 2–3 times weekly to help grind down their ever-growing teeth. Never rely on dry foods, as they lead to malnutrition and overgrown beaks. Observe feeding behavior closely; puffers are intelligent and will learn to associate you with food, often begging at the surface.

Adding a Pea Puffer? Research the species’ adult size and temperament carefully, quarantine new fish before introducing them to your tank, and buy from reputable aquarium stores or breeders.

Breed information on this page is based on the Wikipedia article on the Pea Puffer, supplemented with additional research. Reviewed for accuracy.