克里斯(Ricky Paull Goldin 饰)的好友遭到了不明物种的攻击离奇死亡,这场悲剧吸引了克里斯的母亲安妮(崔西亚·奥尼尔 Tricia O'Neil 饰)的注意,她觉得这整个事件都十分可疑,然而除了她之外并没有人这么认为。安妮找到了研究生化学的博士泰勒(Steve Marachuk 饰),向他寻求帮助,经过两人的重重调查,一群长着翅膀,嗜血而又残暴的变种鱼渐渐浮出了水面。 一年一度的炸鱼庆典即将在海滩上举办,来参加的人们无不兴致勃勃,跃跃欲试。安妮找到了活动的主办方,希望他们能够取消庆典,以保证民众的安全,但利欲熏心的主办方显然没有将安妮的话当成一回事。一场悲剧眼看着就要拉开序幕。A sunken US supply ship off a Caribbean island resort is the focus for a series of mysterious piranha attacks. Investigating the death of one of her son's companions after a scuba-diving trip, Anne Kimbrough breaks into the morgue with holidaymaker Tyler Sherman, only to discover that the fish have wings and can fly. But the hotel manager refuses to call off the annual fish fry on the beach, with inevitable consequences...