Why is it important to keep fish stocks at a level where breeding continues?
Fish that are stopped from breeding grow larger and so provide more food
Breeding fish take in more carbon dioxide from the water than young fish
The fish that are caught are more likely to be free of disease and pests
If too few fish are left to breed the species may disappear from an area
42 exam-style questions on AQA GCSE Biology 7.5 Food production, covering 7.5.1 Factors affecting food security, 7.5.2 Farming techniques, 7.5.3 Sustainable fisheries, and 7.5.4 Role of biotechnology. Each one has a worked solution and a mark scheme showing where the marks go.