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Compass & Seaweb

In a few hours, the massive nets that drag the bottom and weigh up to 15 tones, can destroy deep-sea corals and sponge beds that have taken centuries or millennia to grow. The bottom line is that mistakes made now could take over a century to recover, if they are at all reversible.
The Last Wild Hunt

A synopsis of the report and link to the main study: The Last Wild Hunt: Deep-sea Fisheries Scrape Bottom of the Sea

Quotes: 
In a few hours, the massive nets that drag the bottom and weigh up to 15 tones, can destroy deep-sea corals and sponge beds that have taken centuries or millennia to grow. The bottom line is that mistakes made now could take over a century to recover, if they are at all reversible.