Unit 4: Aquaculture - Fishing Techniques
- Created by: rosieevie
- Created on: 22-05-15 14:47
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- Fishing Techniques
- Pelagic Fishing - middle or surface depths e.g. herring, tuna
- Purse Seine Net
- Shoal of fish surrounded by net with bottom weights
- Net drawn tight to prevent escaping
- Smaller nets used to bring fish on board
- Juvenile catch
- Ghost catch
- Drift Net
- Net many kilometers long with floats on the top
- By-catch - whales turtles
- Juvinelle catch
- Ghost catch
- Mid-Water Pair Trawl
- Large open net dragged through water by two trawler boats
- By-catch - kills porpoises crabs, starfish
- Juvenile fish
- Ghost catch
- Surface Long-Line
- Lines with lures or baited hooks on
- Floats have flags on them
- By-catch - albatrosses
- Energy inefficient
- Ghost catch
- Purse Seine Net
- Demersal Fishing - seabed e.g. cod, plaice
- Bottom Trawl
- Weights hold bottom of net down and disturb fish
- 'Trawl boards' - act like kites to keep sides of net apart
- Floats hold top of net up
- Dissturbance of seabed kills organisms
- Ghost catch
- Long-Line
- Line on sea floor with bait captures fish
- By-catch e.g. sharks, turtles
- Ghost catch
- Bottom Trawl
- Crab/Lobster Pots
- Float and marker attached to string of lobster pots on seabed by rope
- Funnel entrance - lobsters can find way in but not out
- Dead fish bait in pot to lure in lobster
- Pelagic Fishing - middle or surface depths e.g. herring, tuna
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