The lionfish had a fairly large geographical range in the Pacific and now enjoys an even greater distrobution that it resides in the Western Atlantic as well. Best known for their pompous pectoral fins, these members of the family Scorpaenidae pack a serious venomous punch in their dorsal, anal, and pelvic fin spines. Though not usually fatal, an envenomation may cause nausea, abdominal pain, seizures, tremors, and temporary paralysis. Reaching sizes of nearly 18 inches, these predators can be found on reefs or other structures in tropical waters not often deeper than 55 meters. While hunting at night the enlarged pectoral fins are used to trap prey such as fishes, shrimps, and crabs into a corner on the reef.