Ghiozzo
The Ghiozzo are fish mutated by the T-Abyss Virus. They are fast, unpredictable and deadly, able to leap from the water on to land to bite their victims. They swim near the top of the water, making them easy targets from a distance. They are also vulnerable to explosives and shock grenades, which can take out multiple targets at once. On lower difficulties they can be killed with your knife.