Fact:The giant oceanic manta ray can grow to a disc size of up to 7 m (23 ft) with a weight of about 1,350 kg (2,980 lb) but average size commonly observed is 4.5 m (15 ft).Manta rays may live for as long as 50 years.They can swim up to 24 kilometers (15 miles) per hour and their brain is the biggest of all fish.