Barca snakehead (Chana barca)

The Barca snakehead is only known from the upper Brahmaputra River basin the Assum and Nagaland in India, and Sylhet in Bangladesh. It mostly inhabits wetlands, often near the margins, but can also be seen in riverine habitats. It is able to withstand large variations in water temperature and oxygen levels as its habitat experiences large seasonal changes in flood levels.  It often inhabits a vertical tunnel that typically is around one metre (3.3 ft) long and goes down to the water table. The tunnel ends in a chamber where the fish may spend the dry season when the wetlands above it disappear. The overall conservation status of the Barca snakehead is poorly known, but it appears to generally be a scarce or rare species.