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With many continental fish stocks in steep decline, some fleets have adopted bottom trawling as a way to keep supplies flowing; even so, it accounts for less than 1% of the total global fish catch.
If they destroy natural resources, they will build their own tomb
Rémi Parmentier, Deep Sea Conservation Coalition
Powerful boats tow nets which extend to the sea floor; on the end of the net is a heavy roller or plough which keeps the net in contact with the bottom.
This ensures that any fish in the vicinity are caught, but so is everything else.
A report compiled last year for IUCN, the World Conservation Union, and other environmental groups concluded that bottom trawling is "...highly destructive to the biodiversity associated with seamounts and deep-sea coral ecosystems and... likely to pose significant risks to this biodiversity, including the risk of species extinction."