Name Of This Creature Feature?

There are a number of possibilities, depending on the year when you saw the movie:

Frankenfish (2004 TV movie)

IMDb synopsis:

When the body of a man is found in the swamps in Louisiana, medical investigator Sam Rivers is assigned to investigate the murder. He travels with biologist Mary Callahan to the location where the victim resided and he meets his family and friends. They find that genetically engineered Chinese snakeheads which belong to a wealthy hunter are attacking and killing locals. While the group fights to survive, a hunter arrives with his team to hunt the predators.

http://www.imdb.com/title/tt0384833/

Here's the movie trailer:

http://www.youtube.com/watch?v=RrKTLEPeO38

Piranha (1995 TV movie)

IMDb synopsis:

Doctor Baines has been conducting genetic experiments on piranhas and has made them virtually unstoppable. Unfortunately, his assistants, Maggie and Paul, accidentally release the hybrids into the Lost River Lake threatening to destroy everyone in their path. Can they prevent the flesh-eating piranhas from escaping into the ocean and spawning?

http://www.imdb.com/title/tt0114137/

Snakehead Terror (2004)

IMDb synopsis:

A small town, desperate to recover from hard economic times, is under threat when voracious Snakehead fish mutate and survive previous lake chemical poisonings. The fish transform from pests to predators when human growth hormones are dumped into the local lake in the hopes of reviving the local fishing industry. Thriving on the hormones, the Snakehead fish grow to monstrous proportions, devouring everything within reach. Capable of moving and eating on land, they are forced to leave the now barren lake in a desperate search for food - animal, vegetable or human.

http://www.imdb.com/title/tt0371954/

Here's the movie trailer:

http://www.youtube.com/watch?v=Q2S7zB6OoeI