Longest fish migration
Many fish species undertake long annual migrations between their feeding grounds. The longest straight line distance known to have been covered by a fish is 9,335 km (5,800 miles) for a bluefin tuna (Thunnus thynnus) which was dart tagged off Baja, California, Mexico in 1958 and caught 483 km (300 miles) south of Tokyo, Japan, in April 1963. During its journey, its weight increased from 16 kg (35 lb) to 121 kg (267 lb).