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Overfishing
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Overfishing

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Transcript

  • 1.
    • Are fish a renewable or a non-renewable resource?
    • Why do you think that?
  • 2.
    • Fish are renewable resources
    • If we catch a fish and eat it, other fish will be born to replace it.
    • However, in many parts of the world too many fish have been caught ( over-exploited )
    • This means the number of fish available has reduced ( depleted ).
  • 3.
    • Q. People have always caught fish to eat. Why do you think that the problem of over fishing has arisen only recently?
  • 4.  
  • 5.  
  • 6.  
  • 7.  
  • 8.
    • Ireland has many fishing ports.
    • Fishing is extremely important to many of these small fishing villages.
    • Fishing has been carried out in these areas for generations.
  • 9.
    • Big ships (trawlers and super-trawlers are used)
    • Factory ships
    • Modern Equipment
    • Easy Targets
  • 10.  
  • 11.  
  • 12.
    • What problems might arise from using large nets to capture one type of fish?
  • 13. Bycatch refers to fish and other marine life caught ‘incidentally’ in the pursuit of another species Some organisms include 1. Turtles 2. Starfish 3. Sponges
  • 14.
    • Winc
    Winch Sonar Equipment
  • 15.
    • 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.
  • 16. Explosive fishing – the use of dynamite or other explosives to kill fish. Causes for major destruction of reef . Long-line fishing – long baited hooks used to catch swordfish, tuna, sharks, birds, and turtles. They are estimated to kill 180,000 birds worldwide every year.
  • 17.  
  • 18.
    • How can we stop over- fishing?
  • 19.  
  • 20.
    • The population of breeding tunas has been declining steeply for the past decade
    • Will be wiped out completely in 3 years if nothing is done
    • Tunas that are able to reproduce – being wiped out
    • The size of mature tunas has more than halved since the 1990s.
    • The average size of tuna caught off the coast of Libya has dropped from 124kg in 2001 to only 65kg last year.
    • Industrial fishing is the main reason for the problem
    • WWF is calling for the immediate closure of the Mediterranean bluefin tuna fishery to give the species a chance to recover.
    • Trying to create a marine reserve for bluefin tuna in the Balearic Islands.
  • 21.
    • Many types of fish are now endangered because of over fishing.
    • Governments and the EU are trying to limit the amount of fish being caught.
    • They have taken the following steps;
    • 1. Made conservation zones around some countries.
    • 2. Excluded foreign fishing boats from fishing in Irish waters.
    • 3. Reduce the number of fishing fleets.
    • 4. Introduced yearly quotas for fish catches.
    • 5. Banned the fishing of some endangered species.
    • 6. Made the fishing season shorter for some types of fish.