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Fishing Techniques

Fishing Techniques. January 11, 2013. How We Fish in the US:. Tuna. Swordfish. Cod. Halibut. Salmon. Scallops. Oysters. Fishing Methods. Long Line Fishing Purse Seining Trawler and Dredges Drift-net/gillnetting Traps and pots. Bycatch.

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Fishing Techniques

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  1. Fishing Techniques January 11, 2013

  2. How We Fish in the US:

  3. Tuna

  4. Swordfish

  5. Cod

  6. Halibut

  7. Salmon

  8. Scallops

  9. Oysters

  10. Fishing Methods • Long Line Fishing • Purse Seining • Trawler and Dredges • Drift-net/gillnetting • Traps and pots

  11. Bycatch • Any unintended species caught through fishing.

  12. Longlining • Employs a single fish line that can extend for 50 miles! • This central line is strung with smaller lines of baited hooks • Can be set near the surface • Catch pelagic fish like tuna and swordfish • Can be laid on the sea floor • Catch deepdwelling fish like cod and halibut

  13. Longlining

  14. Dangers of Longlining • They hook and kill large numbers of endangered sea turtles, dolphins, and sea birds each year.

  15. Purse Seine Fishing • Establishes a large wall of netting to encircle schools of fish. • Used to catch schooling fish, such as sardines or species that gather to spawn, such as squid. • Danger: Bycatch (such as when tuna seines are intentionally set on schools of dolphins)

  16. Purse Seine Fishing http://www.youtube.com/watch?v=jyeqNOAFkwI

  17. Trawlers and Dredges • Nets are towed at various depths to catch fish or shellfish. • Trawl nets, which can be as large as a football field, are either dragged: • along the sea floor or • midway between the floor and the surface

  18. Trawlers

  19. Dangers of Trawlers • They ruin the seafloor by scraping the bottom. • Bottom trawling can result in high levels of bycatch. • Refer back to shrimp farming and the mangrove forests.

  20. Driftnet/Gillnetting • Uses curtains of netting that are suspended by a system of floats and weights. • They can be anchored to the seafloor or allowed to float at the surface. • Used to catch sardines, salmon, and cod.

  21. Drift Net Fishing

  22. Traps and Pots • Are submerged wire or wood cages that attract fish with bait and hold them alive until fisherman return to haul the catch. • More sustainable: • Less bycatch • Less sea floor impact

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