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purse seine
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Fisheries
Fishing Techniques
Purse Seine
Fisheries
Modern tuna purse seiners in port.
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French tuna purse seiner F/V KERGUELEN at Mahe, Seychelles. Note helicopteron flying bridge. It is used to visually search for schools of tuna.
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The Spanish tuna purse seiner F/V TXORI-EDER in the western Indian Ocean.Smaller vessel on the stern is secured to purse seine and when a school of tunais encountered, the small boat is launched and it helps ship encircle it.
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Observation helicopter operating off tuna purse seiner.
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Spotters looking for signs of tuna such as logs on surface or agitated water.Tuna tend to congregate around floating logs or other floating objects on thesurface.
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Spotter using large binoculars to look for signs of tuna.
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School of tuna agitating the surface while pursuing smaller fish.
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Tuna purse seiner is headed towards school of tuna to encircle with net.Workboat that helps hold net during deployment is still on starboard stern.Smaller vessel in water is used to make noise toscare tuna into staying within confines of net prior to
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Tuna purse seiner is deploying net with assistance of workboat which is seen atfar end of net. The workboat will pull the net in a circle to capture the tuna.
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Tuna purse seiner is deploying net with assistance of workboat which is seen atfar end of net near horizon on upper right of picture. The boat appears as asmall rectangle behind a vertical rope.
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Workboat holding net prior to ship encircling school of tuna.
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Helicopter eye view of ship pulling net in circle to capture tuna. Workboat isin lower center of photo and is holding the end of the net.
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Ship is finishing deployment of purse seine net. Almost all of the net is nowin the water and the ship will continue to encircle the school of tuna while theworkboat (not shown) holds the other end of the net.
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Ship has finished deploying net which is still attached by a cable. Prior tonet closing, the small boat in photo makes noise to keep tuna herded into net.
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Encircling the school of tuna is now complete. The workboat is bringing theend of the net back to the ship so that hauling in can proceed.
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The net is now closing in a nearly perfect circle. The purse seiner is nowstarting to pull the net back on board. The workboat is seen to the left and issecured to the ship. It is now acting like a tugboat and is pulling the purseseiner away from
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The winch operator is hauling in the cables to close the net. This closesthe bottom of the net such that it is now like a purse. The fish no longer haveany way to escape.
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Another view of hauling on the cables to close the net.
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A view of tuna agitating the surface as the net is drawing closed.
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A view of the tuna that are captured inside the net.
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