Razortooth (2007)

Four college students head to the Everglades for an internship with a professor they've never met before. The professor is studying eels, but does not tell the students he has created a mutant giant eel which is on the loose and must be contained.

After this set up, we get escaped convicts, canoe club kids, townsfolk at the diner, a crowd in the local trailer park, and five million other characters we will never know anything about other than they just might end up being eaten by an eel.

The local animal control officer and the incompetent sheriff, who happens to be his ex-wife, start looking into strange happenings in the town. Why lookee here, the local diner has been trashed, the workers killed and partially eaten, and there's a lot of slime all over the place. What could have done such a thing?! A giant eel perhaps? No, not according to the sheriff who thinks it's those darn escaped prisoners.

The cgi eels, for there are more than one, are not just in the water, but also in the trees where they circle down the trunk and spring on our unsuspecting victims. They also are not a constant size as they go through sewer lines and come up through a shower drain. There is also a scene where someone wrestles an eel which is the width of a dryer pipe, when previously it looked to have the circumference of a 200 year old tree.

This movie also features a prime example of a character carrying around a totally random item which ends up being the exact means to kill the dreaded menace to society.