Fishing
- Created by: 8cburton
- Created on: 26-05-15 17:25
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- Fishing
- Pelagic fish
- Live in upper parts of the water
- Caught by drift netting
- Suspending a net from floats stretched between two boats so that fish swim into it
- Bottom feeders
- Caught by trawling
- Dragging a large net through the water
- Caught by trawling
- Measures to reduce overfishing
- Quotas on catches
- Restricting net mesh size (large mesh nets allow juvenile fish through)
- International agreements limiting catches
- Enforcing closed seasons for fishing
- Enforcing exclusion zones
- Fish farming
- The growth of phytoplankton can be aided by the addition of artificial fertilisers
- Fish grow rapidly reared in warm waters discharged from factories
- Disease spreads rapidly
- Huge amounts of pesticides used
- Can harm marine invertebrates
- Can spread to wild fish
- Huge amounts of pesticides used
- Eutrophication
- Fish excreta, waste food and fertiliser are carried in the water to the wider community around rearing pens
- Escaped fish
- Interbreed with wild fish weakening wild stocks
- Farmed salmon eat 3X their body weight of fish food (other fish) so this is not the best use of resources
- Pelagic fish
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