Mystus gulio, the Long Whiskers Catfish, is a species of catfish . The generic name is probably derived from the Latin “mystax”, meaning “moustache”, due to the long barbels.It is found in India, Sri Lanka, Pakistan, Nepal and Vietnam. It is primarily a brackish water fish that enters and lives in fresh water. In freshwater, adults occur mainly in larger water bodies (rivers and streams) with mud or clay substrates, and rarely found in smaller streams.