© 2014 Pearson Education, Inc. Chapter 13 Biological Productivity and Energy Transfer Issues That Affect Marine Fisheries.

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Presentation transcript:

© 2014 Pearson Education, Inc. Chapter 13 Biological Productivity and Energy Transfer Issues That Affect Marine Fisheries

© 2014 Pearson Education, Inc. Marine Fisheries Commercial fishing Most from continental shelves More than 20% from areas of upwelling that make up 0.1% of ocean surface area

© 2014 Pearson Education, Inc. Overfishing Fish from standing stock – the mass present in the ecosystem at any given time Overfishing – fish stock harvested too rapidly, juveniles not sexually mature to reproduce Reduction in Maximum Sustainable Yield (MSY)

© 2014 Pearson Education, Inc. Exploitation Status of Marine Fish

© 2014 Pearson Education, Inc. Overfishing 80% of available fish stock fully exploited, overexploited, or depleted/recovering Large predatory fish reduced Increased fish production, decreased stocks

© 2014 Pearson Education, Inc. Incidental Catch or Bycatch Non-commercial species are taken incidentally by commercial fishers. Bycatch may be up to 8 times more than the intended catch. –Birds, turtles, dolphins, sharks

© 2014 Pearson Education, Inc. Tuna and Dolphins Tuna and dolphins swim together. Caught in purse seine net Marine Mammals Protection Act addendum for dolphins Driftnets or gill nets banned in 1989

© 2014 Pearson Education, Inc. Purse Seine Net

© 2014 Pearson Education, Inc. Fisheries Management Regulate fishing Conflicting interests Human employment Self-sustaining marine ecosystems International waters Enforcement difficult

© 2014 Pearson Education, Inc. Fisheries Management Many large fishing vessels Governments subsidize fishing 1995—world fishing fleet spent $124 billion to catch $70 billion worth of fish

© 2014 Pearson Education, Inc. Fisheries Management Northwest Atlantic Fisheries such as Grand Banks and Georges Bank Canada and United States restrict fishing and enforce bans Some fish stocks in North Atlantic rebounding Other fish stocks still in decline (e.g., cod)

© 2014 Pearson Education, Inc. Fisheries Management Effectiveness

© 2014 Pearson Education, Inc. Fisheries Management Consumer choices in seafood Consume and purchase seafood from healthy, thriving fisheries –Examples: farmed seafood, Alaska salmon Ecosystem-based fishery management Avoid overfished or depleted seafood –Examples: tuna, shark, shrimp

© 2014 Pearson Education, Inc. Seafood Choices