Looks like a whale shark but has 5 gills. “Probable” it was a baby of its species as the backbone was of a cartilaginous nature. Silver dollar size eyes. Pupil did not dilate or contract. According to the description with the picture, 45 feet in length; 30,000 pounds in weight; circumfrence 23 feet 9 inches; diameter 8 feet 3 inches; mouth (open) 31 inches; mouth 38 inches wide; mouth 43 inches deep; tongue 40 inches long; several thousand teeth; hide 3 inches thick; no scales; had swallowed an animal weighing 1500 pounds; tail measures 10 feet from tip to tip; pectoral fin 5 feet long, 3 feet wide; dorsal fin 3 feet long, 2 feet 9 inches wide; gills 4 feet; the liver weighed 1700 pounds.
Whale sharks also have 5 gill slits, a cartilaginous skeleton, and lack scales.
Like all sharks, it lacks a ‘swim bladder’, and instead uses its large oiler liver for buoyancy.
Whale sharks have upwards of six thousand teeth, but these are much smaller that in most other sharks and very clearly disproportionate for its size.
The eyes of a whale shark are lid-less, lack a nictitating membrane and are again much smaller in proportion to their size than is common for shark species, most likely because, as filter feeders, vision is much less essential to them. They can also be rotated back into the head for protection.
The skin on the back of the whale shark includes a layer of connective tissue up to 15cm thick, and is the thickest skin of any species in the world.
It might also be a juvenile basking shark, or even a very rare Megachasma. Both of which (being filter feeders) have a number of similar characteristics.