Threats to fish stocks

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  • Created by: Emma
  • Created on: 06-03-13 19:48

1. What are trawl nets and why are they a threat to fish stocks?

  • Taporing tube shaped and can catch vast amounts of fish at a time.
  • Small net and so are not threats
  • Nets that drag along the sea bottom and so disrupt the fish.
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2. Why is sewage a threat to natural fish stocks?

  • It contaminates the water and the fish - may kill them.
  • It causes increased seagull numbers in that area-more predators.
  • Substances in the sewage stop the fish from growing.

3. Why is fertilizer run-off bad for fish stocks?

  • It's not bad- can be an alternate food source for the fish.
  • Causes algal bloom - can be toxic to some fish.
  • Causes algal bloom which suffocates the fish.

4. Why is plastic a threat to fish?

  • It looks like food and remains in the water - kills the fish.
  • It remains in the water and can cut the fish.
  • Floats to the bottom and covers the sea bed-stops the food cycle.

5. What does G.P.S stand for and why is it a threat to fish stocks?

  • Global Positioning System - locates shoals accurately.
  • Gradient Positioning System
  • Glacier positioning service
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