BULLETPROOF SKIN
The skin of the ocean sunfish is very rough; it is covered with tiny toothlike structures called denticles. It is also very thick and tough so tough that it has the reputation of being bulletproof. Another characteristic feature of ocean sunfish is that, unlike most other bony fish, they do not have a swim bladder (a gas filled organ), pelvic fins, or a lateral line (a sensory system). They have a mouth that is very small compared to their body size, and the teeth in each jaw are fused to form a parrotlike break up larger prey items, such as jellyfish and comb jellies. They sometimes also eat small crustaceans and fish.