Creatures from the Abyss

Creatures from the Abyss (original title Plankton) is a 1994 Italian b-movie directed by Al Passeri and written by Richard Bauman. The film starred Clay Rogers, Michael Bon, Sharon Twomey, Laura di Palma, Ann Wolf, and infamous low-budget movie director and actor Deran Sarafian.
Synopsis.
A group of five teenagers, three girls, and two boys get lost in the ocean with a Dinghy, and a big storm begins. Suddenly they spot a yacht sitting in the middle of the ocean, and they go to investigate and to find shelter. But in fact, the yacht was a secret laboratory studying mutated fish results of radioactive plankton. One of the specimens escapes kills the whole crew, and preys on the unsuspecting teenagers.
Reception.
The movie review website, "b-movies.gr" gave the film a score of 4/5 and said that the film is a must for sea monster fans.
Home video.
Shriek Studio released "Creatures from the Abyss" on 31 July 2007 as part of the "Mutant Monsters Triple Feature" along with "The Dark" and "The Being".