Fishing boats in some areas must use nets with a larger mesh size.
How does this help to conserve fish stocks?
Fewer fish of all sizes are caught, so the total catch each year falls
Larger fish escape through the net, so they can continue to breed
The fish caught are larger, so fewer fish are needed to fill the quota
Young fish escape through the net and survive long enough to breed
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.