Deep sea bottom trawling
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Bottom trawling, an industrial fishing method that drags large, heavy nets across the seafloor stirs up huge, billowing plumes of sediment on shallow seafloors that can be seen from space. As a result of scientific studies showing that bottom trawling kills vast numbers of corals, sponges, fishes and other animals, bottom trawling has been banned in a growing number of places in recent years. Now satellite images show that spreading clouds of mud remain suspended in the sea long after the trawler has passed. But what satellites can see is only the "tip of the iceberg," because most trawling happens in waters too deep to detect sediment plumes at the surface, say scientists speaking a symposium session called Dragnet: Bottom Trawling, the World's Most Severe and Extensive Seafloor Disturbance at the American Association for the Advancement of Science Annual Meeting February
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What Are The Impacts Of Bottom Trawling On The Environment? - WorldAtlas
Bottom trawling is trawling towing a trawl , which is a fishing net along the sea floor. It is also referred to as "dragging". The scientific community divides bottom trawling into benthic trawling and demersal trawling. Benthic trawling is towing a net at the very bottom of the ocean and demersal trawling is towing a net just above the benthic zone. Bottom trawling can be contrasted with midwater trawling also known as pelagic trawling , where a net is towed higher in the water column. Midwater trawling catches pelagic fish such as anchovies , and mackerel , whereas bottom trawling targets both bottom-living fish groundfish and semi-pelagic species such as cod , squid , shrimp , and rockfish.
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So green Brexit is actually a thing
Deep sea trawling causes damage to delicate ecosystems. Breaking with tradition, it was an EU member state Luxembourg, which held the EU presidency in the second half of that brought the issue back onto the European agenda after it was rejected by the European Parliament in December The European Council gave its approval on 6 November last year, paving the way for trilogue negotiations. This victory is largely down to the efforts of ocean protection NGOs, like Bloom and Pew, which have spent eight years campaigning to protect deep sea ecosystems against gill netting and trawling. The text accepted on Thursday was significantly watered down compared to versions tabled in previous negotiations.
Deep-sea trawling is devastating corals and pristine marine habitats that have gone untouched since the last ice age, a leading marine biologist has warned. A survey of the world's reefs and seamounts — giant submerged mountains that rise more than a kilometre above the seabed — has revealed widespread damage to the ecosystems, many of which are home to species unknown to science, said Jason Hall-Spencer at Plymouth University in the UK. Hall-Spencer, a researcher involved with the Census of Marine Life , a worldwide project to catalogue life in the oceans, called for the establishment of an international network of marine reserves where deep-sea trawling was banned. Deep-sea trawlers use giant, heavy-duty nets that are dragged over the seafloor at depths of more than a kilometre. The nets are fitted with rubber rollers called "rock hoppers", which destroy the corals that provide habitats for fish and other marine organisms.
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