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Over fishing by, abdal rahman malik
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Over fishing by, abdal rahman malik

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  • 1. OVERFISHING
  • 2. CONTENTS What is overfishing? Consequences Global Levels of Fish Catch Rising Down the Food Chain Bycatch Harmful Methods of Fishing Bottom-Trawling No Take Zones Aquaculture Bibliography
  • 3. WHAT IS OVERFISHING? Catching too much fish for the system to support by reproduction. When people catch fish faster than the fish can repopulate. On a global scale we have enough fishing capacity to cover at least four Earth like planets.
  • 4. CONSEQUENCES If overfishing continues, fish populations will be reduced even more, no matter what measures are taken. Overfishing not only depletes the fish but seriously harms marine environment. Because the fish population has decreased so much, many other species have been placed at risk because they now lack their major food source.
  • 5. GLOBAL LEVELS OF FISH CATCH Fish Stocks: o 52% of fish stocks are fully exploited o 20% are moderately exploited o 17% are overexploited o 7% are depleted o 1% is recovering from depletion Between 1950 and 1994, the ocean fishing industry increased the total catch by 400%. Global Fish Stocks are expected to Collapse by 2050 at Current Exploitation Rates. THE CURRENT LEVEL OF GLOBAL FISH CATCH IS IN NO WAY SUSTAINABLE!!!
  • 6. GLOBAL LEVELS OF FISH CATCHThe graph points out that current levels of fishing are obviously
  • 7. FISHING DOWN THE FOOD CHAIN Cause: Commercially valuable, bigger, slower growing species have been overfished. (e.g., tuna, cod, snapper) Effect: They target large quantities of smaller species of fish with less commercial value. (squid, sardines, oysters, mussels, and shrimp) Less predatory pressure. Less competition for food.
  • 8. BYCATCH Living creatures caught unintentionally by fishing gear. Unlike target species, bycatch is unwanted and often unused. Bycatch may be kept or sold. Might be thrown back as discard if not usable. Handling and exposure sometimes injure the bycatch, which may die after being discarded.
  • 9. HARMFUL METHODS OF FISHING Gillnetting – A invisible to fish fine-filament net used for capturing mainly salmon, cod and sardine. Damages other species. Cyanide fishing – Cyanide is used to stun and capture live coral reef fish. Cheap and effective but illegal.
  • 10. HARMFUL METHODS OF FISHINGExplosive fishing – theuse of dynamite or otherexplosives to kill fish.Causes for majordestruction of reef. Long-line fishing – long baited hooks used to catch swordfish, tuna, sharks, and turtles.
  • 11. BOTTOM-TRAWLING Dragging huge, heavy nets along the sea floor. Large metal plates and rubber wheels attached to these nets move along the bottom and crush nearly everything in their path. Water life forms are very slow to recover from such damage.
  • 12. NO-TAKE ZONES Preserved areas where species are protected. Fishing or catching of other marine animals is prohibited. Help species regenerate, to restore population. Helps species which are not included in no- take zones to restore population.
  • 13. AQUACULTURE The farming of aquatic organisms – keeping them under controlled conditions. Reduces the worlds dependence on wild stocks of fish. Helps to feed the worlds growing population. Negative impact on wild species.
  • 14. BIBLIOGRAPHY1. http://overfishing.org/pages/what_is_overfishing.php2. http://see-the-sea.org/topics/commerce/overfishing.htm3. http://www.treehugger.com/files/2010/08/how-bad-is-overfishing-what-to-stop-it.php4. http://www.seafoodsource.com/newsarticledetail.aspx?id=42949905505. http://www.seaweb.org/resources/briefings/fishdownweb.php6. http://archive.greenpeace.org/comms/fish/part3.html7. http://seagrant.gso.uri.edu/factsheets/Bycatch.html8. http://food.change.org/blog/view/overfishing_hurts_economy_public_health_and_ocean_ecosystems9. http://www.msnbc.msn.com/id/32222783/ns/world_news-world_environment/10. http://apesnature.homestead.com/chapter12.html11. http://www.copperwiki.org/index.php?title=Destructive_fishing12. http://www.greenpeace.org/international/campaigns/save-our-seas-2/save-deep-sea-life13. http://www.wri.org/publication/reefs-at-risk/cyanide-fishing14. http://www.jobmonkey.com/alaska/html/gillnetting.html15. http://www.tracc.00server.com/Fisheries/blast_fishing/blastfishing_index.html16. http://www.providence.edu/polisci/students/aquaculture/environmentalimpact.html17. http://wwf.panda.org/?162001/Mediterranean-bluefin-tuna-stocks-collapsing-now-as-fishing-season-opens18. http://www.greenpeace.org/international/en/campaigns/oceans/marine-reserves/roadmap-to-recovery/Save- the-bluefin-tuna-of-the-Mediterranean-/19. http://www.pnwsalmoncenter.org/20. http://oregonstate.edu/instruct/anth481/sal/crintro1.htm21. http://www.groundtruthtrekking.org/Issues/Fisheries/Salmon.html