My review was written in July 1985 after watching the movie on New World video cassette.
"Terror in the Swamp" is a tame horror picture available as a video cassette, bypassing domestic theatrical release. Filmed in Houma, Louisiana, in 1983, pic is typical of low-budget, regional horror filmmaking but is rather skimpy in the shocks and violence area.
The late Billy Holliday, who resembles Dabney Coleman on screen, worte and toplines as game warden Frank. He finds a mangled body on the Copasaw (local swamp area), but can't figure out whether a gator or perhaps a bear killed the man. It turns out that local scientists, funded by South American backers, have been experimenting on breeding a larger nutria (a brown-furred, webbed-foot water rodent) to be used in making fur coats. Inadvertently, a mutated nutriaman has been created and is killing local folks.
While the police, Frank and military authorities hunt the critter, good ol' boys such as the very fat T-Bob (Michael Tedesco) and his brother also head toward Poacher's Cove to kill it. An unsatisfying ending has the monster burned up on a boat.
Director Joseph Catalanotto (who reteamed with Holliday on latter's final film, "French Quarter Undercover") wisely shows the nutriaman only in long shots or obscured through bushes, avoiding a revelation of a phony guy in a hairy outfit. Main interest here is the local color and interesting regional accents of the folksy cast.