These three species are generally quite docile in disposition and given to passively filter-feeding on very small organisms. Several larger great whites caught by anglers have since been verified, but were later disallowed from formal recognition by IGFA monitors for rules violations. The question of maximum weight is complicated by the unresolved question of whether or not to include the shark's stomach contents when weighing the shark.
The reasons for their migration and what they do at their destination is still unknown. The great white shark has a robust, large, conical snout. A particularly large female great white nicknamed "Deep Blue", estimated measuring at 6.1 m (20 ft) was filmed off Guadalupe during shooting for the 2014 episode of Shark Week "Jaws Strikes Back".
The upper and lower lobes on the tail fin are approximately the same size which is similar to some mackerel sharks. Deep Blue would also later gain significant attention when she was filmed interacting with researcher Mauricio Hoyas Pallida in a viral video that Mauricio posted on Facebook on 11 June 2015.
From above, the darker shade blends with the sea and from below it exposes a minimal silhouette against the sunlight. Though rumors have stated this shark was exaggerated in size or non-existent altogether, witness accounts by the then young Craig Anthony Ferreira, a notable shark expert in South Africa, and his father indicate an unusually large animal of considerable size and power (though it remains uncertain just how massive the shark was as it escaped capture each time it was hooked).
Great white sharks, like many other sharks, have rows of serrated teeth behind the main ones, ready to replace any that break off. Ferreira describes the four encounters with the giant shark he participated in with great detail in his book "Great White Sharks On Their Best Behavior".
megalodon is estimated to have been considerably larger than the great white shark, estimated at up to 17 m (56 ft) and 59,413 kg (130,983 lb).