Monkfish (NOAA Photo Library / CC BY)
Monkfish (Lophiidae) have flattened bodies and very large upturned mouths. Like frogfish (their smaller relatives), the monkfish attracts potential prey by wiggling its first dorsal spine, which has evolved into a thin antenna tipped with a lure. Monkfish can grow up to 1.2 meters (47 inches) in length. However, most species are smaller.