After the events at Lake Victoria, the prehistoric school of blood-thirsty piranhas make their way into swimming pools, plumbing, and a newly opened water park.

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?

Natsu is unable to reveal her feelings to 'bento' (lunchbox) vendor Sone. Through the arrangement of Haruo, a man she has just met, she begins living together with Sone. But things aren't the way she expected them to be...

Agent of special department "Piranha" Kirill Mazur and his colleague Olga go to the far north with the assignment to liquidate an underwater secret weapon lab in the guise of a mutual vacation. All of a sudden, they find themselves in the world where civilization laws are forgotten, and this deadly weapons are kept by gangsters who are controlled by a new "master of taiga" Prohor, whose leisure time is spent hunting at humans. Mazur didn't know that he would have to trade his familiar gun for a hand-made bone knife, and save his companion and himself instead of saving the world. For them, this safari in northern forests would be no less dangerous as for the live targets.

去年夏天，维多利亚湖涌进的上万名年轻人，一夕变成异种食人鱼的美味大餐！但被消灭的食人鱼，居然只是还没长大的小宝贝？事隔一年，另一个超high天堂也将变成人间炼狱！ 　　一个巨型水上乐园即将开幕，为了节省经费，于是将隔壁的湖水导流至水上乐园里，殊不知开启了连接地狱的通道！一只只更凶猛的食人鱼游窜入园，锁定帅哥辣妹更青春的肉体，它们已准备好大开杀戒，血染乐园…

去年夏天，维多利亚湖涌进的上万名年轻人，一夕变成异种食人鱼的美味大餐！但被消灭的食人鱼，居然只是还没长大的小宝贝？事隔一年，另一个超high天堂也将变成人间炼狱！ 　　一个巨型水上乐园即将开幕，为了节省经费，于是将隔壁的湖水导流至水上乐园里，殊不知开启了连接地狱的通道！一只只更凶猛的食人鱼游窜入园，锁定帅哥辣妹更青春的肉体，它们已准备好大开杀戒，血染乐园…

在维多利亚湖食人鱼的惨剧发生一年之后，两名农夫在一个湖边再次遇袭。与此同时，当地刚开业的大型水上乐园The Big Wet为了节约经费将湖水导向乐园的水池…

A scuba diving instructor, her biochemist boyfriend, and her police chief ex-husband try to link a series of bizarre deaths to a mutant strain of piranha fish whose lair is a sunken freighter ship off a Caribbean island resort.