Half of all sea fish species have disappeared from the major fishing grounds of the world, according to a study that shows how ocean life has declined rapidly in the past 50 years.
The dramatic fall in the diversity of fish is blamed on overfishing rather than pollution or climate change, the scientists behind the study said yesterday.
The study, which examined fishing logbooks dating back to the 1950s, also found that the size of ocean "hot spots", which were traditionally rich in a diverse array of fish species, had shrunk significantly over the same period.
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