The Biggest Fish in the World: Giants of the Ocean and Rivers

The Whale Shark holds the record at 12+ meters and 21 tons. Ocean Sunfish (Mola Mola) is the heaviest bony fish at 2,300 kg. Oarfish is the longest at 11 meters.

Great White Sharks reach 6 meters. Giant Trevally and Tuna push 200 kg. Freshwater giants include Arapaima at 200 kg, White Sturgeon at 800 kg, and Mekong Giant Catfish at 300 kg.

Most large fish are threatened by overfishing, bycatch, and habitat destruction..