Overfishing

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Overfishing

  1. 1. <ul><li>Are fish a renewable or a non-renewable resource? </li></ul><ul><li>Why do you think that? </li></ul>
  2. 2. <ul><li>Fish are renewable resources </li></ul><ul><li>If we catch a fish and eat it, other fish will be born to replace it. </li></ul><ul><li>However, in many parts of the world too many fish have been caught ( over-exploited ) </li></ul><ul><li>This means the number of fish available has reduced ( depleted ). </li></ul>
  3. 3. <ul><li>Q. People have always caught fish to eat. Why do you think that the problem of over fishing has arisen only recently? </li></ul>
  4. 8. <ul><li>Ireland has many fishing ports. </li></ul><ul><li>Fishing is extremely important to many of these small fishing villages. </li></ul><ul><li>Fishing has been carried out in these areas for generations. </li></ul>
  5. 9. <ul><li>Big ships (trawlers and super-trawlers are used) </li></ul><ul><li>Factory ships </li></ul><ul><li>Modern Equipment </li></ul><ul><li>Easy Targets </li></ul>
  6. 12. <ul><li>What problems might arise from using large nets to capture one type of fish? </li></ul>
  7. 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
  8. 14. <ul><li>Winc </li></ul>Winch Sonar Equipment
  9. 15. <ul><li>Dragging huge, heavy nets along the sea floor.  </li></ul><ul><li>Large metal plates and rubber wheels attached to these nets move along the bottom and crush nearly everything in their path. </li></ul><ul><li>Water life forms are very slow to recover from such damage. </li></ul>
  10. 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.
  11. 18. <ul><li> How can we stop over- fishing? </li></ul>
  12. 20. <ul><li>The population of breeding tunas has been declining steeply for the past decade </li></ul><ul><li>Will be wiped out completely in 3 years if nothing is done </li></ul><ul><li>Tunas that are able to reproduce – being wiped out </li></ul><ul><li>The size of mature tunas has more than halved since the 1990s. </li></ul><ul><li>The average size of tuna caught off the coast of Libya has dropped from 124kg in 2001 to only 65kg last year. </li></ul><ul><li>Industrial fishing is the main reason for the problem </li></ul><ul><li>WWF is calling for the immediate closure of the Mediterranean bluefin tuna fishery to give the species a chance to recover. </li></ul><ul><li>Trying to create a marine reserve for bluefin tuna in the Balearic Islands. </li></ul>
  13. 21. <ul><li>Many types of fish are now endangered because of over fishing. </li></ul><ul><li>Governments and the EU are trying to limit the amount of fish being caught. </li></ul><ul><li>They have taken the following steps; </li></ul><ul><li>1. Made conservation zones around some countries. </li></ul><ul><li>2. Excluded foreign fishing boats from fishing in Irish waters. </li></ul><ul><li>3. Reduce the number of fishing fleets. </li></ul><ul><li>4. Introduced yearly quotas for fish catches. </li></ul><ul><li>5. Banned the fishing of some endangered species. </li></ul><ul><li>6. Made the fishing season shorter for some types of fish. </li></ul>

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