Overfishing Mila Daskalova Alexander Krastev Teodor Peev 10/3
What is Overfishing? <ul><li>Catching more fish than restorable  (2) </li></ul><ul><li>Not sustainable – population decrea...
Bycatch <ul><li>Nonselective fishing – other species  (2) </li></ul><ul><li>Catching unwanted organisms </li></ul><ul><li>...
Bottom-trawling <ul><li>Method of fishing with heavy nets that are dragged over the bottom of the ocean  (1) </li></ul><ul...
http://nakedmaninthetree.files.wordpress.com/2009/05/before-and-after-view-of-botto.jpg http://www.greenpeace.org/raw/imag...
Effects of Overfishing <ul><li>Decrease in biodiversity  (4) </li></ul><ul><li>Food webs disturbed </li></ul><ul><li>Ecosy...
No-Take Zones <ul><li>Areas where fishing is forbidden  (3) </li></ul><ul><li>Ensures that: </li></ul><ul><ul><li>Fish pop...
Other measures against overfishing <ul><li>Further restrictions on quantity of caught fish </li></ul><ul><li>Better contro...
http://web.mit.edu/12.000/www/m2011/finalwebsite/graphics/intro/OVERFISHINGfromPEW.gif
Endangered Species <ul><li>90% of marine predators are endangered </li></ul><ul><li>Tuna </li></ul><ul><li>Swordfish </li>...
Black Sea Overfishing <ul><li>Large fish and predators (mackerel, blue fin tuna, dolphins) removed during 60’s, 70’s  (6) ...
Spain – One of the Largest European Fishing Nations <ul><li>It represents ¼ of the European fishing capacity </li></ul><ul...
Work Cited <ul><li>1. &quot;Bottom trawling impacts, clearly visible from space.&quot; Eurek Alert. N.p., n.d. Web. 8 June...
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Mila, alex k, teodor 103 overfishing ppt

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Mila, alex k, teodor 103 overfishing ppt

  1. 1. Overfishing Mila Daskalova Alexander Krastev Teodor Peev 10/3
  2. 2. What is Overfishing? <ul><li>Catching more fish than restorable (2) </li></ul><ul><li>Not sustainable – population decreases </li></ul><ul><li>Globally, fish-catching capacity is 3x the needed </li></ul><ul><li>Fish-catching methods are ineffective at preserving the balance of the aquatic ecosystems (2) </li></ul>
  3. 3. Bycatch <ul><li>Nonselective fishing – other species (2) </li></ul><ul><li>Catching unwanted organisms </li></ul><ul><li>Throwing them away (discards) </li></ul><ul><li>Likelihood to survive is little (2) </li></ul><ul><li>Sometimes - 80% of the total catch (2) </li></ul>
  4. 4. Bottom-trawling <ul><li>Method of fishing with heavy nets that are dragged over the bottom of the ocean (1) </li></ul><ul><li>Huge bycatch </li></ul><ul><li>Very harmful for the seafloor organisms </li></ul><ul><li>Destroys whole bottom communities (1) </li></ul>
  5. 5. http://nakedmaninthetree.files.wordpress.com/2009/05/before-and-after-view-of-botto.jpg http://www.greenpeace.org/raw/image_full/international/seafood/understanding-the-problem/fisheries-problems-today/bottom-trawling.jpg http://earthhopenetwork.net/bottom_trawling_fish_nets.jpg
  6. 6. Effects of Overfishing <ul><li>Decrease in biodiversity (4) </li></ul><ul><li>Food webs disturbed </li></ul><ul><li>Ecosystems' balance is ruined (4) </li></ul><ul><li>Destruction of reefs </li></ul><ul><li>Depletion of a major food source </li></ul><ul><li>Fishing industry ruined (4) </li></ul>
  7. 7. No-Take Zones <ul><li>Areas where fishing is forbidden (3) </li></ul><ul><li>Ensures that: </li></ul><ul><ul><li>Fish populations have time to restore </li></ul></ul><ul><ul><li>Fishing industry will prosper in the future (3) </li></ul></ul><ul><li>4% of the Great Barrier Reef (4) </li></ul><ul><li>Caribbean region (3) </li></ul>
  8. 8. Other measures against overfishing <ul><li>Further restrictions on quantity of caught fish </li></ul><ul><li>Better control over fishing vessels’ actions; measures against illegal fishing (5) </li></ul><ul><li>More artificial fisheries - allow for less marine fishing without harming food supplies </li></ul><ul><li>Abolition of inefficient methods like bottom trawling – already done in many countries (5) </li></ul>
  9. 9. http://web.mit.edu/12.000/www/m2011/finalwebsite/graphics/intro/OVERFISHINGfromPEW.gif
  10. 10. Endangered Species <ul><li>90% of marine predators are endangered </li></ul><ul><li>Tuna </li></ul><ul><li>Swordfish </li></ul><ul><li>Skate </li></ul><ul><li>Cod </li></ul>http://boiltheocean.files.wordpress.com/2009/06/swordfish.jpg
  11. 11. Black Sea Overfishing <ul><li>Large fish and predators (mackerel, blue fin tuna, dolphins) removed during 60’s, 70’s (6) </li></ul><ul><li>Small fish populations increase (not for long) </li></ul><ul><li>Increase in plankton levels and plankton-eating jellyfish populations - jellyfish boom </li></ul><ul><li>Decrease in species diversity (6) </li></ul><ul><li>Ecosystem disturbed </li></ul><ul><li>Too much jellyfish present, becoming a dominant species </li></ul><ul><li>Bad effect on tourism (6) </li></ul>
  12. 12. Spain – One of the Largest European Fishing Nations <ul><li>It represents ¼ of the European fishing capacity </li></ul><ul><li>The Fishing Armada – its vessels catch more than entire nation’s fishing fleets </li></ul><ul><li>It travels as far as Antarctica and Africa </li></ul><ul><li>They are continuing to overfish </li></ul>
  13. 13. Work Cited <ul><li>1. &quot;Bottom trawling impacts, clearly visible from space.&quot; Eurek Alert. N.p., n.d. Web. 8 June 2010. <http://www.eurekalert.org/pub_releases/2008-02/s-bti021508.php>. </li></ul><ul><li>2. Overfishing. N.p., n.d. Web. 8 June 2010. <http://overfishing.org/>. </li></ul><ul><li>3. &quot;Overfishing.&quot; World Resources Institute. N.p., n.d. Web. 8 June 2010. <http://archive.wri.org/ page.cfm?id=3060&z=?>. </li></ul><ul><li>4. University of Michigan. N.p., n.d. Web. 8 June 2010. <http://sitemaker.umich.edu/gc2sec7labgroup3/over-fishing>. </li></ul><ul><li>5. &quot;Overfishing.&quot; Greenpeace. N.p., n.d. Web. 8 June 2010. <http://www.greenpeace.org/international/en/campaigns/oceans/overfishing/>. </li></ul><ul><li>6. Ecopath with Ecosim. N.p., n.d. Web. 8 June 2010. <http://www.ecopath.org/node/228>. </li></ul>

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