Bigeye sixgill shark is a rare deepwater cow shark often been misidentified as the larger bluntnose sixgill Shark. Very little is known about this shark, with a poor knowledge of its distribution and no knowledge of population trends.
Adults are usually 180 cm long. It is found in tropical and temperate waters in the northeast and central Atlantic, Mediterranean Sea, Pacific and the Indian Ocean. They are found at a depth from 90-621 m with excursions to the surface. It is uncommonly taken by bottom trawl and longline fishnets but if of relatively small importance to fisheries.
The males mature at 142-178 cm and females at 123-157 cm . They are ovoviviparous, with 13-26 pups per litter measuring up to 40-45 cm total length at birth. It feeds on bony fishes, tuna and crustaceans.
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