Tetraodon cochinchinensis

Thailand, Cambodia, Laos and Vietnam.

Found in both still and slow-moving bodies of water including rivers, lakes and ponds. Some of these habitats contain brackish water.

45 ∗ 30 ∗ 30 cm18 ∗ 12 ∗ 12 in - ~41 litres~11 US gal

Best kept in a heavily-planted setup with twisted roots and branches to provide additional cover. The use of floating plants to diffuse the light is also recommended. This species is very sensitive to deteriorating water conditions, so regular partial water changes are a must.

Temperature: 24 – 28 °C75 – 82 °F

pH: 6.5-7.8

Hardness: 8-15°H

Relishes all kinds of shellfish, as well as worms and other meaty live and frozen foods. It should be fed snails and unshelled shellfish (such as crab legs, mussels etc.) regularly, in order to maintain its sharp teeth. As with other puffers, these grow continuously and become a problem for the fish if they are not kept ground down.

A generally aggressive and intolerant species that really should be kept alone. Its beak-like mouth can easily bite chunks from other fish, or in extreme cases rip them to pieces. It's also very aggressive towards conspecifics and should never be kept in groups.

Unknown.

Has been achieved in aquaria, but little data is available. Apparently the male exhibits some degree of brood care.

Puffer fish are so called as they have the ability to inflate their elastic stomachs with water or air. This is usually a response to some kind of threat, although in the aquarium many specimens appear to inflate themselves for no apparent reason. The fish becomes 2 or 3 times it's normal size, which makes the fish both big enough to scare away many potential predators, and difficult to swallow.

Many parts of the body of puffers contain the deadly neurotoxin tetrodoxin. This is the same poison found in the notorious blue-ringed octopus. When ingested in sufficient quantities, it can cause paralysis and death. As yet there is no known antitoxin and to humans it is over 1000 times deadlier than cyanide. Grotesquely, the victim usually remains conscious as he or she becomes paralysed. It's a famous delicacy in Japan, but is prepared only by highly-trained chefs, and even then many people have died from eating it.

T. cochinchinensis is part of the 'target' puffer group, which contains 4 other species, namely T. cambodgiensis, T. leirus, T. turgidus and T. hilgendorfi. Some confusion surrounds this group, as they all hail from the same geographical area and share very similar physical characteristics. Cochinchinensis can be distinguished by the clear red spot situated towards the rear of the fish. It's one of the more frequently seen puffers in the hobby, though it is by no means common. All the Tetraodon species are ambush predators in nature.