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Comparison of Commercial Fishing Practices (Purse Seines (Most common…
Comparison of Commercial Fishing Practices
Purse Seines
Most common methods
Maximizes the amount of fish they catch
Large net which is towed, often by 2 boats until a school of tuna is spotted
The net encloses the school of fish and is drawn closed to resemble a purse
The fish can not swim down to escape through the bottom of the net
62% of all tuna fish is caught through Purse seines
Fish Aggregating devices (FAD's)
Can be permanent or temporary
It lures fish, e.g. a buoy or a float
All fish species are programmed to find shelter when eating
300 species of fish have been shown to seek shelter under a FAD
Objects that float are often equipped with satellite-linked sonar devices
Commercial fisheries use FAD's as well as Purse Seines and are able to locate the FAD's through the satellite system
Longline Fishing
Trawlers set up fishing lines which are up to 150 km long
Have a main line and secondary lines branching off it
Each line have thousands of barbed, baited hooks
Large tuna species are targeted by longline fishing
300000 albatross are killed every year using this method of fishing
Things in common
FAD's and Purse Scenes result in 10% more by-catch than nets alone
Large numbers of other species are also caught through By-catch