Unit 4: Aquaculture - Environmental Impacts
- Created by: rosieevie
- Created on: 22-05-15 21:23
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- Environmental Impacts
- Bycatch - non-target organisms caught fishing (usually returned to sea dead)
- Immature fish - too small to sell - may end up reducing future catches by killing fish before they can breed
- Individuals caught when catch quota has been reached - killed unnecessarily
- Species with no commercial value
- Reflective metal disks help wildlife detect net presence
- Fishing at night and weighting fishing lines stops birds being caught
- Seabed Disturbance - trawling or dredging can kill plants and animals
- Some nets have balls, metal bars or chains to disturb the seabed
- Food Web Effects
- Affect predator populations
- Affect food sources
- Affect competitor populations
- Affect bycatch populations
- Affect prey populations
- Ghost Fishing - lost fishing gear that continues to catch organisms
- Dead organisms may act as bait, attracting other organisms
- Biodegradable lobster and crab pots so they fall apart
- May also cause physical damage e.g. coral reefs
- Factory Fishing - boats that stay long times at sea and catch more fish
- Overexploitation means boats have to go further to be cost effective
- High fuel consumptions
- Effluent from fish processing is discharged and can cause deoxygenation
- Fuel Spills, Pollutants, Exhaust Emissions
- Bycatch - non-target organisms caught fishing (usually returned to sea dead)
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