These denizens of the deep look like normal Koi until you get close and notice the rows and rows of razor sharp teeth. Alone they pose little threat, but in schools, you better make a run for dry ground.
Koi have light-grey body with red fins. Their eyes are bright yellow and mouths have rows of razor sharp teeth.
While trying to kill them before going into water is a good idea, it's hard to accomplish because of Koi swimming pattern. Once in water, best weapon against them is Riot Gun, because of it's close distance damage and Koi tendency to charge at Lo Wang.