21_fisheries_oceanography - 1 Fisheries Oceanography...

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Unformatted text preview: 1 Fisheries Oceanography Fisheries Oceanography Types of Commercial Fish Migration Patterns Fishing Methods Magnitude of World Fisheries Environmental Factors Contributing to Natural Variation in Fish Populations Fisheries Management Basic Types of Marine Fisheries 2 Fish Migration North Sea Herring Migration Pacific Salmon Migration 3 Fishing Methods Bottom Trawling fishing net used to collect organisms on or near the bottom of the ocean. Bottom of net weighted and dragged across seafloor. 4 Mid-Water Trawling Used to Collect Pelagic Fish from Mid-Depths Purse Seine Net Used to Collect Relatively Shallow Fish Purse Seine Net Deployment 5 Setting a Purse Seine Net Closing a Purse Seine Net Pulling Up a Purse Seine Net 6 Gathering Fish from a Purse Seine Net Sorting Fish Gathered from the Purse Seine Net Surface Long-Line Fishing 7 Bottom Long-Line Fishing Drift Net Fishing Can be Hundreds of Kilometers Long! (outlawed by all nations, but violation are still found occasionally) Magnitude of World Fisheries 8 Distant-Water Factory Ships Location of World Fishing Grounds Estimated global fish landings 1950 1999 Pauly Nature 2002 Note: IUU = illegal, unregulated and unreported fish catches Global catch has leveled off beginning in the early 1990s at about 80 million metric tons annually 9 Natural Environmental Factors Contributing to Variation in Fish Populations...
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21_fisheries_oceanography - 1 Fisheries Oceanography...

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