Scombridae
Scombrids are usually predators. They are found in tropical and temperate waters. The fish can move very quickly. Some members of the family are partially endothermic (warm-blooded). This helps them to maintain high speed and activity. Other adaptations include a large amount of red muscle. It lets them to maintain activity over long periods of time. Scombrids like the yellowfin tuna can move as fast as 22 km/hr (14 mph).