http://www.newsweek.com/greenland-shark-survive-lifespan-food-metabolism-study-1688228

Greenland sharks only need about 200g of fish per day to survive, scientists have discovered, potentially providing an insight into how they manage to live for hundreds of years.

By studying the metabolic rates of this vulnerable species, researchers led by Eric Ste-Marie, from the University of Windsor in Canada, have gained valuable information on this remarkable and understudied species in the face of anthropogenic pressures.