The Blue Catfish (Ictalurus furcatus) is the largest species of North American catfish, with some individuals exceeding 100 pounds and measuring over 5 feet in length. They have a slate... The Blue Catfish (Ictalurus furcatus) is the largest species of North American catfish, with some individuals exceeding 100 pounds and measuring over 5 feet in length. They have a slate blue body, a forked tail, and a humpbacked appearance. Blue Catfish are native to the Mississippi River Basin but have been introduced to other waters due to their popularity as a sport fish. They are opportunistic feeders, consuming a wide variety of live and dead organisms.Click here to read more about Blue Catfish.