Creatures from the Abyss(1994)

Original title: Plankton

Five teenagers embark on a boating trip off the coast of Florida. The teens get hopelessly lost at sea after they get caught in a fierce storm. Fortunately, the quintet stumble across an abandoned yacht in the middle of the ocean with a mysterious biology lab on board it. Unfortunately, there are also ferocious mutated prehistoric fish running amok on the yacht. Will any of the teens survive this harrowing ordeal?