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Destructive Fishing Practices

Destructive Fishing Practices. Three-Dimensionality of the Seafloor. blog.thesietch.org. stevedeneef.photoshelter.com. flowergarden.noaa.gov. Destructive Fishing Methods. Bottom trawling Dredging Dynamite fishing Traps. Bottom Trawling. Occurs from subpolar to tropical latitudes

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Destructive Fishing Practices

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  1. Destructive Fishing Practices

  2. Three-Dimensionality of the Seafloor blog.thesietch.org stevedeneef.photoshelter.com flowergarden.noaa.gov

  3. Destructive Fishing Methods • Bottom trawling • Dredging • Dynamite fishing • Traps

  4. Bottom Trawling • Occurs from subpolar to tropical latitudes • Occurs in public waters • Few scientific studies (but increasing) • Time of recovery to original structure – years to centuries www.duke.edu

  5. www.saveourseas.com

  6. Bottom Trawling • Bottom Trawling Info • How a Trawl Works • Trawling on a Non-vegetated Bottom • Trawling in Seagrass

  7. Effects of scallop dredging on a gravel bottom: George’s Bank: 84 m depth Un-fished area Fished area 500 m away

  8. http://oceana.org/

  9. Effects of Trawling • Homogenizes sediments; eliminates microtopography; overturns, moves, and buries boulders and cobbles; leaves long-lasting grooves • Crushes and buries some infauna, exposes others • Removes, damages or displaces most structure-forming species • Eliminates most late-successional species • Releases large pulses of carbon

  10. Similarities with Clear-cutting • Both activities: • Remove large amounts of biomass from the ecosystem • Alter the substratum • Eliminate late successional species • Release large pulses of carbon to the overlying air or water savethedeepsea.blogspot.com nefc1.org

  11. Frequency of trawling in some representative areas

  12. Trawling and Bycatch www.njscuba.net

  13. Bycatch by Gear Type

  14. TEDs and BRDs http://kurrawa.gbrmpa.gov.au/

  15. Dredging www.southlandnz.com hatchery.hpl.umces.edu

  16. Dredging • Oyster Dredging in WA State

  17. Dynamite fishing • Jacques Cousteau video • Dynamite fishing - humans and sharks react • Widespread in Southeast Asia, the Aegean Sea, and coastal Africa

  18. Trap and Pot Fishing • Used for lobsters, crabs, fish • Wide range in size of traps www.coexploration.org www.montereyfish.com

  19. Habitat degradation in trap fisheries: • Damage to sessile benthic fauna/flora during placement, fishing, and hauling

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