"There is probably no such thing as an economically viable deep-water fishery that is sustainable... We must consider deep-sea stocks as
non-renewable resources."
Callum Roberts is professor of marine conservation at the University of York in England and a Pew Fellow in Marine Conservation.
His research focuses on threats to marine ecosystems and species, and on finding the means to protect them. His work includes studies of the profound historical and recent alteration of marine ecosystems by fishing, on the extinction risk of marine species and on global conservation priorities for coral reefs.
Recently, he has highlighted the imminent danger from fishing to life in the deep sea - the Earth's final wilderness frontier.
His best-known work is on the performance and design of marine reserves, areas that are protected from all fishing. His studies show that marine reserves can be effective both as conservation tools and can enhance fish catches outside their boundaries.
In 2002 he won the Marsh Prize for Conservation Biology from the Zoological Society of London for his work on marine reserves.