15. Lancetfish
The lancetfish is unlike the previous fish in size; these predators can reach up to 6.6 feet in length and they scavenge the sea with their razor sharp teeth. The entire enormous jaw is lined with either inch long spikes or tiny serrated teeth to ensure their prey doesn’t escape. They intelligently hide in plain sight by using the coloring of their smooth bodies to shield themselves until they’re ready to ambush. The lancetfish has also gotten the reputation of being a cannibal, which is where it got its nickname “cannibal fish”.