708 results found
 

Map

Page | June 3, 2008 at 19:12

Greenpeace's proposal for a network of marine reserves in the Mediterranean.

Seabed mining

Page | February 4, 2011 at 22:07

The deep seabed, which lies below the oceans beyond the jurisdiction of any state, is home to unusual and rarely studied ecosystems and species. Some hydrothermal vents - underwater 'geysers' driven by volcanic activity - support complex...

Pots and traps

Page | June 17, 2008 at 14:41

Pots, traps or ‘creels’ include a variety of designs that take the form of cages or baskets with one or more openings or entrances, with or without bait. They are usually set on the seabed, either singly or in rows, and are connected by ropes...

Hook-and-line

Page | June 17, 2008 at 14:41

Hook-and-line is a general term used for a range of fishing methods that employ short fishing lines with hooks in one form or another (as opposed to long-lines). It includes hand-lines, hand-reels, powered reels, rod/pole-and-line, drop lines,...

Pelagic long-lines

Page | June 17, 2008 at 14:42

Long-lines consist of short lines (called snoods) carrying baited hooks, attached at regular intervals to a longer main line that is laid on the bottom or suspended horizontally with the help of surface floats. Main lines can be over 150 km long...

Bottom long-lines

Page | June 17, 2008 at 14:42

Long-lines consist of short lines (called snoods) carrying hooks, attached at regular intervals to a longer main line that is laid on, or close to, the seabed. Main lines are up to 150 km long and can carry several thousand hooks.

Pelagic gillnets

Page | June 17, 2008 at 14:42

Pelagic gillnets or ‘set nets’ are fine-filament nets that are kept at or below the surface by numerous floats and weights and held in position by anchors. If a fish’s head goes through the net but its body can’t follow, it is ‘gilled’ or...

Bottom gillnets

Page | June 17, 2008 at 14:42

Bottom gillnets or ‘set nets’ are fine-filament nets, the lower edge of which touch the seabed, and are held in place by numerous floats, weights and anchors. If a fish’s head goes through the net but its body can’t follow, it is ‘gilled’ or...

Purse seines

Page | June 17, 2008 at 14:43

Fish are encircled by a large ‘wall’ of net, which is then brought together to retain the fish by using a line at the bottom that enables the net to be closed like a purse.

Pelagic trawls

Page | June 17, 2008 at 14:43

The front net sections are often made of very large meshes or ropes, which herd the fish towards the back of the funnel-shaped net. Pelagic trawls may be towed by one or two (pair trawl) boats.

Danish seines

Page | June 17, 2008 at 14:43

A fishing net, similar to a small trawl net, with a conical net bag with two relatively long wings. Two long heavy ropes, one attached to each wing, are used to encircle a large area of the seabed to herd the fish into the net and then to haul...

Beam trawls

Page | June 17, 2008 at 14:44

A type of bottom trawl in which the horizontal opening of the net is provided by a heavy beam mounted at each end on guides or skids that travel along the seabed. On sandy or muddy bottoms, a series of ‘tickler’ chains are strung between the...

Dredges

Page | June 17, 2008 at 14:44

Similar to a beam trawl, a dredge consists of a rugged triangular steel frame and tooth-bearing bar, behind which a mat of linked steel rings is secured. A heavy netting cover joins the sides and back of this mat to form a bag in which the catch...

Demersal otter trawls

Page | June 17, 2008 at 14:44

A type of bottom trawl that has two rectangular 'doors' or 'otterboards' to keep the mouth of the funnel-shaped net open horizontally while the net is being towed. A vertical opening is maintained by weights on the bottom and floats on the top.

Fisheries techniques

Page | June 17, 2008 at 14:45

Some fishing techniques have a devastating impact on the other marine life that shares the oceans with the fish being caught. They not only damage marine habitats, but also catch and kill large numbers of other marine creatures, including...

Aquaculture

Page | June 17, 2008 at 14:18

Greenpeace seeks to ensure clean and healthy oceans for the future, and part of this is working to improve the standards of international seafood trade. As wild stocks decline, the demand for farmed shrimp, salmon, tuna, tilapia and other marine...

The collapse of a cod fishery

Page | May 8, 2009 at 21:03

In 1992, the collapse of the Newfoundland Grand Banks cod fishery in Canada put 40,000 people out of work. The area, once renowned as the world’s most productive fishing grounds, was devastated by years of overfishing and incompetent fisheries...

Driven to extinction

Page | May 8, 2009 at 21:19

The Steller's sea cow (Hydrodamalis gigas) was a large sirenian mammal, which grew up to 10 metres long and weighed between 6 and 8 tonnes. It was discovered in 1741 near the Asiatic coast of the Bering Sea by German biologist Georg Steller, who...

Trawling

Page | May 8, 2009 at 20:53

Bottom trawling is a highly destructive fishing technique in which huge, heavy nets attached to large metal plates and rubber wheels are dragged across the sea bed; they destroy everything in their path.

A brief history of overfishing

Page | May 8, 2009 at 21:10

Evidence shows that humans have been depleting the wealth of the oceans throughout history. Area by area, species by species, man has ruthlessly exploited the seas to the point of depletion, limited only by technological means or the...

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