Piranha 3DD (2012) on Netflix

Lake Victory is a dead place after the tragic events with the invasion of prehistoric flesh-eaters piranhas. In Cross Lake, Merkin County, the greedy Chet opens The Big Wet Water Park against the will of his stepdaughter Maddy. When the van of her friends Travis and Ashley is found in the water and the couple is missing, Maddy and her friend Shelby miss them and they talk on a wooden deck on the lake; out of the blue, they are attacked by piranhas. Maddy visits the specialist in piranhas Mr. Carl Goodman with her former school friend Barry, who works at The Big Wet, and with her former boyfriend, Deputy Kyle, and they discover piranhas in the lake. However Chet refuses to shutdown his water park and soon his costumers are under the attack of the fearful piranhas.