Viêt Nam - List of fishes

It owes its name of "freshwater shark" only to the shape of its dorsal fin. It behavior and it food have nothing comparable. It acclimates easily to the aquarium.

Small barbs located around its mouth enable it to detect food. It is easy to breed in captivity. The species is very prolific, nests often have over 500 juveniles.

It has a brighter color than the female. In breeding season, it builds a bubble nest. After courtship and spawning, it collects and keeps the eggs in the nest until hatching. The males are so aggressive towards one another that in the Far East, fights are organized.

It lives in fresh water but also in brackish water. Like most puffer fish species, its flesh and organs are toxic. In captivity, adults can be aggressive towards other fish species.

Much of it body is transparent. In the rainy season, it takes advantage of the floods to exit the riverbed where it lives to breed. It easily accommodates to life in the aquarium. Its flesh is used for the production of a "fish sauce".

It is equipped with gills and respiratory organs, so it can breathe underwater or on the surface. In breeding season, it built a nest with viscous bubbles that shelters the eggs. It easily breeds in captivity and there are several farmed species.

It can breathe oxygen from the air, it stays at least half an hour under the surface between two breathes. Its tapered pectoral fins have a tactile and sensory role. Because of its large size, it is not recommended for the aquarium of a specimen.