A vast fleet of Chinese boats is sailing around the waters off Latin America, accused of illegal fishing and threatening the rich biological diversity of the South Pacific. (Subscribe: https://bit.ly/C4_News_Subscribe)

Hundreds of vessels have spent weeks trawling for stocks, in a region which is considered one of the world's most biodiverse marine areas.

Illegal fishing has become a highly lucrative criminal activity, racking up revenues in the tens of billions of pounds.

Now, Peru's coastguards are out defending their territorial waters.
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