Horror sequel in which a species of violent prehistoric piranha continue to terrify a small town the chaos unleashed in piranha 2010 by a group of the omnivorous fish set free by an earthquake that split the floor of a lake may only have been the beginning the tests of marine biologist carl goodman christopher lloyd indicate that these fish were only adolescents suggesting their parents would be even fiercer adversaries when the piranha make their way into the towns plumbing system