1 / 49

Fishing Methods

Fishing Methods. Traditional analogues for modern methods Spears, arrows Active traps Passive traps, fish ponds Hooks Active nets Passive nets Inland & nearshore subsistence fishing spears exploding harpoons. Spear Hook-n-line Traps. Exploding harpoon Trolling Trolling-n-chumming

levins
Download Presentation

Fishing Methods

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Fishing Methods • Traditional analogues for modern methods • Spears, arrows • Active traps • Passive traps, fish ponds • Hooks • Active nets • Passive nets • Inland & nearshore subsistence fishing • spears exploding harpoons

  2. Spear Hook-n-line Traps Exploding harpoon Trolling Trolling-n-chumming Demersal Trawl line Pelagic Trawl line 2000 hooks; 3-4% Traps FADs Old & New Methods

  3. Gill Nets Floats & weights Drift nets Efficiency Fiber advances Bycatch 33000km—80% Banned in 1992 Trawl Nets demersal & pelagic Power needed Beam beam  Otter 10-100m opening Echo-sounder sonar Nets

  4. A comparison between typical trawl catch and a typical gillnet catch associated with the pre-industrial fishing. Note that the cod end of the net on the factory trawler is bigger than the entire boat housing the traditional fisher.

  5. Largehead hairtail (Trichiurus lepturus). Weight to 5 kg, length to 2.3 meters

  6. Purse Seines • Globally, most fish catch…by far • Catch fish schooling near surface • 100km x 100m • Fish must aggregate in large schools • Powerful means to deploy & retrieve • Dories (50’s) to power block

  7. Icelandic freezer trawler Svalbakur, capable of catching 60 tonnes per haul

  8. Purse seine boats beginning a set on a 64-tonne school of Atlantic menhaden in coastal waters of North Carolina.

  9. Catch Amount by type • Purse Seine ~50% • Herring,sardine,anchovies,tuna,mackerel • Otter Trawl ~17% • Pollock, cod,whiting • Lines ~ 9% • Tunas,swordfish,cod,halibut,haddock,etc • Pound/trap nets ~8% • Lobsters,crabs • Gill Nets ~6% • Squid,salmon,billfish

  10. Technology • Echo sounders • Synthetic fibers • Power • Boat range • Preservation of catch • Drying/salting icing,canning,freezing

  11. Artisanal Fishing

  12. A fisherman in Cochin, India

  13. The beachfront market of St.-Louis, Senegal

  14. Fishing technology in Senegal. Wives parcel out the dregs of catches. The best fish are sold to European traders or seafood processors.

  15. Schematic of modern, high-tech fishing vessel. From left to right: purse seine, squid jigger, long liner, trawl net equipped with sonar to automatically track schools of fish. The factory trawler depicted above is the Alaska Ocean. It is capable of processing more than 600 tonnes of pollock per day into surimi, the protein paste used in imitation seafood products.

More Related