This is a great question. There are many species of anglerfish (around 200!) and most of them are probably the top predators of their food chains. Anglerfish typically "catch" prey by luring them in with a small filament on the top of their head that acts as "bait." When prey gets close enough to touch the filament, an anglerfish's jaw will close reflexively. Anglerfish are called opportunistic predators because of the way they catch their prey, and in fact, they sometimes even prey on animals that are larger than them! This means that besides humans, they probably don't have any predators.