2. Fangtooth Fish

Remember what we said about how the creatures get uglier when the water gets deeper? Because this is an example of that. Trust us, it only gets worse from here. Poseidon must have had a bad day and decided to make something ugly (or in this case, a lot of uglies) to scare unwanted people off the ocean or something. This fish can be found 5000 meters under the sea, but are more commonly found from 200 and 2000 meters. By the day time, this fish would be hiding in the dark, and by night it swims up to feed.