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OVERFISHING &
AQUACULTURE
WHERE DO WE GET THE FISH
AND SHELLFISH WE EAT?
Oceans and Fish Farms
   7% of the global food supply comes from marine
    organisms.
   55% (3.8%) of our annual catch...
Major Commercial Marine Speices
                    Fish                                Shellfish

      Demersal         ...
WHAT IS THE STATE OF
GLOBAL FISHERIES TODAY?
Dire Prediction for the Future
http://www.npr.org/templates/story/story.php?storyId=6469061
Trend Toward Overfishing
                            100



                             80
(millions of metric tons)
    ...
WHAT ARE THE MAJOR FISHING
STRATEGIES USED?
Fishing Strategies                                                Spotter airplane
                                       ...
WHAT OTHER TECHNOLOGY
IS USED IN COMMERCIAL
FISHING?
Sonar Unit Used for Fishing
Scientists Use Satellites to Track Fish
http://www.sfgate.com/cgi-bin/article.cgi?file=/chronicle/archive/1998/08/05/MN828...
Microwave Telemetry
http://microwavetelemetry.com/Fish_PTTs/index.php
Monitoring Variables
   Storage Capacity of Device
   Signal Transmission Strength
   Size of Device
   Type of Monitor
WHAT PROBLEMS ARISE
FROM THESE FISHING
METHODS?
Bycatch
   Refers to fish and
    other marine life
    caught quot;incidentallyquot;
    in the pursuit of
    another s...
Common Bycatch Organisms
   Turtles
   Starfish
   Sponges
   Skates
Bycatch Variables
   Species
   Size
   Sex
   Quality
WHAT LAWS GOVERN
GLOBAL FISHING?
Magnuson-Stevens Fishery Conservation and Management Act (1976)
http://www.mms.gov/eppd/compliance/fcma/index.htm
Law Variables
   specify a time frame in which to end overfishing
    and rebuild overfished stocks that is as short as
 ...
WHAT ORGANIZATIONS ARE
WORKING TO RESTORE
GLOBAL FISHING?
Marine Stewardship Council
http://www.msc.org/html/content_458.htm
CAN ARTIFICIAL REEFS HELP
RESTORE MARINE
ECOSYSTEMS?
Artificial Reefs
   Concrete blocks
   Acres of old cars
   Drug transport vessels
   Oil Rigs
Artificial Reefs Help Dolphins
http://archives.cnn.com/2000/NATURE/05/16/hong.kong.dolphins.enn/
Artificial Reefs - Cons
   Represent an inexpensive way to throw out trash
   Cause damage to natural habitats during th...
CAN AQUACULTURE HELP
RESTORE FISH POPULATIONS?
Types of Aquaculture
   Fish Farming
   Fish Ranching
Norway’s Fish Farms in Danger
http://www.npr.org/templates/story/story.php?storyId=17638050
Overfishing & Aquaculture
Overfishing & Aquaculture
Overfishing & Aquaculture
Overfishing & Aquaculture
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Overfishing & Aquaculture

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Covers current state of global fisheries, fishing technology, bycatch, artificial reefs and aquaculture.

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Transcript of "Overfishing & Aquaculture"

  1. 1. OVERFISHING & AQUACULTURE
  2. 2. WHERE DO WE GET THE FISH AND SHELLFISH WE EAT?
  3. 3. Oceans and Fish Farms  7% of the global food supply comes from marine organisms.  55% (3.8%) of our annual catch comes from the oceans.  45% (3.2%) of our annual catch comes from aquaculture.
  4. 4. Major Commercial Marine Speices Fish Shellfish Demersal Pelagic Crustaceans Mollusks (mostly bottom dwelling) (surface dwelling) Hake Sardine Anchovy Krill Oyster Clam Herring Shrimp Haddock Mackerel Lobster Octopus Squid Cod Tuna Crab
  5. 5. WHAT IS THE STATE OF GLOBAL FISHERIES TODAY?
  6. 6. Dire Prediction for the Future http://www.npr.org/templates/story/story.php?storyId=6469061
  7. 7. Trend Toward Overfishing 100 80 (millions of metric tons) Catch 60 40 20 0 2000 1950 1960 1970 1980 1990 Year Total World Fish Catch
  8. 8. WHAT ARE THE MAJOR FISHING STRATEGIES USED?
  9. 9. Fishing Strategies Spotter airplane Trawler fishing Fish farming in cage Purse-seine fishing trawl flap sonar trawl lines fish school trawl bag Fish caught by gills Drift-net fishing Long line fishing float buoy lines with hooks
  10. 10. WHAT OTHER TECHNOLOGY IS USED IN COMMERCIAL FISHING?
  11. 11. Sonar Unit Used for Fishing
  12. 12. Scientists Use Satellites to Track Fish http://www.sfgate.com/cgi-bin/article.cgi?file=/chronicle/archive/1998/08/05/MN82865.DTL
  13. 13. Microwave Telemetry http://microwavetelemetry.com/Fish_PTTs/index.php
  14. 14. Monitoring Variables  Storage Capacity of Device  Signal Transmission Strength  Size of Device  Type of Monitor
  15. 15. WHAT PROBLEMS ARISE FROM THESE FISHING METHODS?
  16. 16. Bycatch  Refers to fish and other marine life caught quot;incidentallyquot; in the pursuit of another species.  Results from use of fishing gear and practices that are not selective.
  17. 17. Common Bycatch Organisms  Turtles  Starfish  Sponges  Skates
  18. 18. Bycatch Variables  Species  Size  Sex  Quality
  19. 19. WHAT LAWS GOVERN GLOBAL FISHING?
  20. 20. Magnuson-Stevens Fishery Conservation and Management Act (1976) http://www.mms.gov/eppd/compliance/fcma/index.htm
  21. 21. Law Variables  specify a time frame in which to end overfishing and rebuild overfished stocks that is as short as possible  the biology of the stock  the needs of fishing communities  recommendations by international organizations  the interaction of the overfished stock within the marine ecosystem.
  22. 22. WHAT ORGANIZATIONS ARE WORKING TO RESTORE GLOBAL FISHING?
  23. 23. Marine Stewardship Council http://www.msc.org/html/content_458.htm
  24. 24. CAN ARTIFICIAL REEFS HELP RESTORE MARINE ECOSYSTEMS?
  25. 25. Artificial Reefs  Concrete blocks  Acres of old cars  Drug transport vessels  Oil Rigs
  26. 26. Artificial Reefs Help Dolphins http://archives.cnn.com/2000/NATURE/05/16/hong.kong.dolphins.enn/
  27. 27. Artificial Reefs - Cons  Represent an inexpensive way to throw out trash  Cause damage to natural habitats during their construction  Can displace naturally occurring species and habitats  Tend to concentrate fish unnaturally, making them more vulnerable to overfishing
  28. 28. CAN AQUACULTURE HELP RESTORE FISH POPULATIONS?
  29. 29. Types of Aquaculture  Fish Farming  Fish Ranching
  30. 30. Norway’s Fish Farms in Danger http://www.npr.org/templates/story/story.php?storyId=17638050
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