WWF map of the world fishing grounds
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How fishing has expanded since 1950

A report commissioned by environmental group WWF shows the expansion in fishing since 1950.

It is illustrated in this animation, which shows how fishing has spread across the oceans.

The colours refer to "primary production required" (PPR) - the percentage of the total solar energy captured and used by living things through photosynthesis, that goes towards the fish humans catch and eat.

The light blue areas indicate the lowest levels, with orange and red areas having respectively larger PPRs.

Industrial fishing is likely to feature as a major issue at this June's Rio+20 summit in Brazil.

Animation courtesy of WWF.