The mola are the heaviest of all the bony fish, with large specimens reaching 14 feet vertically and 10 feet horizontally and weighing nearly 5,000 pounds. Sharks and rays can be heavier, but they're cartilaginous fish.

How big is the largest sunfish?

The heaviest specimen on record is a bump-head sunfish (Mola alexandrini) caught off Kamogawa, Chiba, Japan, in 1996; it weighed 2,300 kilograms (5,070 pounds) and measured 2.72 metres (8 feet 11 inches) long.

Is the sunfish the biggest fish?

Sunfish are the largest bony fish in the sea.