Mila, alex k, teodor 103 overfishing ppt
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Transcript of Mila, alex k, teodor 103 overfishing ppt
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OverfishingMila Daskalova
Alexander KrastevTeodor Peev
10/3
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What is Overfishing?
Catching more fish than restorable (2)
Not sustainable – population decreases Globally, fish-catching capacity is 3x the
needed Fish-catching methods are ineffective at
preserving the balance of the aquatic ecosystems (2)
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Bycatch
Nonselective fishing – other species (2)
Catching unwanted organisms Throwing them away (discards) Likelihood to survive is little (2)
Sometimes - 80% of the total catch (2)
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Bottom-trawling
Method of fishing with heavy nets that are dragged over the bottom of the ocean (1)
Huge bycatch Very harmful for the seafloor organisms Destroys whole bottom communities (1)
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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
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Effects of Overfishing
Decrease in biodiversity (4)
Food webs disturbed Ecosystems' balance is ruined (4)
Destruction of reefs Depletion of a major food source Fishing industry ruined (4)
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No-Take Zones
Areas where fishing is forbidden (3)
Ensures that: Fish populations have time to restore Fishing industry will prosper in the future (3)
4% of the Great Barrier Reef (4)
Caribbean region (3)
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Other measures against overfishing
• Further restrictions on quantity of caught fish
• Better control over fishing vessels’ actions; measures against illegal fishing (5)
• More artificial fisheries - allow for less marine fishing without harming food supplies
• Abolition of inefficient methods like bottom trawling – already done in many countries (5)
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http://web.mit.edu/12.000/www/m2011/finalwebsite/graphics/intro/OVERFISHINGfromPEW.gif
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Endangered Species
90% of marine predators are endangered
Tuna Swordfish Skate Cod
http://boiltheocean.files.wordpress.com/2009/06/swordfish.jpg
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Black Sea OverfishingLarge fish and predators (mackerel, blue fin tuna, dolphins) removed during 60’s, 70’s (6)
Small fish populations increase (not for long)Increase in plankton levels and plankton-eating jellyfish populations - jellyfish boomDecrease in species diversity (6)
Ecosystem disturbedToo much jellyfish present, becoming a dominant species Bad effect on tourism (6)
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Spain – One of the Largest European Fishing Nations
It represents ¼ of the European fishing capacityThe Fishing Armada – its vessels catch more than entire nation’s fishing fleetsIt travels as far as Antarctica and AfricaThey are continuing to overfish
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Work Cited1. "Bottom trawling impacts, clearly visible from space." Eurek Alert. N.p., n.d. Web. 8 June
2010. <http://www.eurekalert.org/pub_releases/2008-02/s-bti021508.php>.
2. Overfishing. N.p., n.d. Web. 8 June 2010. <http://overfishing.org/>.
3. "Overfishing." World Resources Institute. N.p., n.d. Web. 8 June 2010. <http://archive.wri.org/page.cfm?id=3060&z=?>.
4. University of Michigan. N.p., n.d. Web. 8 June 2010. <http://sitemaker.umich.edu/gc2sec7labgroup3/over-
fishing>.
5. "Overfishing." Greenpeace. N.p., n.d. Web. 8 June 2010.
<http://www.greenpeace.org/international/en/campaigns/oceans/overfishing/>.
6. Ecopath with Ecosim. N.p., n.d. Web. 8 June 2010. <http://www.ecopath.org/node/228>.