An oceanic species (pelagic) found in open water , but rarely seen near reefs. They school primarily by size, either in single species or multi-species groups. Larger fish frequently school with porpoises, also associated with floating debris and other objects. Feed on fishes, crustaceans and squids. Sensitive to low concentrations of oxygen and therefore is not usually caught below 750 feet (250 m) in the tropics. Peak spawning occurs during the summer, in batches. Eggs and larvae are found in the open ocean (pelagic).