factors affecting supply and use of fishing

Question 1

Tragedy of the commons

Answer 1

resulted in overfishing: when fish are harvested faster than they can breed to replace themselves

Question 2

2 types of overfishing:

Answer 2

1. Growth overfishing-overfishing of juvenile fish stocks

2. Recruitment overfishing-overfishing of adult spawning stock

Question 3

North sea herring stocks have decreased from 2200 thousand tonnes in 1963 to

Answer 3

around 100 (very low) in 1975

Question 4

growing mechanisms of fishing:

Answer 4

• electronic navigation aids such as LORAN and GPS have turned the planets waters into a grid, so can return to within 10m of chosen location
• ships can rcieve satellite weather maps of water temperature fronts, indicating where fish are travelling
• range of nets e.g. surrounding nets used for pelagic species e.g. tuna stopping them from escaping downwards