New figures show 26% of all sharks, rays and related species in the north-east Atlantic are threatened with extinction. Seven per cent are classed as critically endangered, while a fifth are regarded as near-threatened.

Aggressive overfishing threatens to push some shark species to extinction, and a new study puts annual shark deaths at 100 million.

A Florida freediving guide has captured images showing a bull shark so massive and “abnormally round” that it dwarfed other sharks and divers brave enough to swim in its company.