Heteropneustes fossilis
The Asian stinging catfish or fossil cat ("Heteropneustes fossilis") is a species of airsac catfish found in India, Bangladesh, Pakistan, Nepal, Sri Lanka, Thailand, Myanmar, and Bhutan. "H. fossilis" is found mainly in ponds, ditches, swamps, and marshes, but sometimes occurs in muddy rivers. It can tolerate slightly brackish water. It is omnivorous. This species breeds in confined waters during the monsoon, but can breed in ponds, derelict ponds, and ditches when sufficient rain water accumulates. It is in great demand due to its alleged medicinal value. The stinging catfish is able to deliver a painful sting to  humans. Poison from a gland on its pectoral fin spine has been known to be extremely painful. This species grows to a total length of , and is an important component of local commercial fisheries. It is also farmed and found in the aquarium trade. In India in Kerala, it is locally called as "kadu" (Malayalam:കടു) or "karri" (Malayalam:കാരി). It is highly preferred in Assam and locally known as "xingi maas" (Assamese: শিঙি মাছ). In Bangladesh, this fish is called "singi mach", In Sri Lanka, this fish is called () by the Sinhala-speaking community.