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

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