A coastal fishery has an estimated stock of 20 million sardines immediately before fishing.
Scientists predict the effect of three fishing plans.
| Fishing plan | Sardines caught in the fishing season in millions | Sardines added to the stock by breeding before the next fishing season in millions |
|---|---|---|
| A | 4 | 9 |
| B | 8 | 8 |
| C | 12 | 6 |
Calculate the estimated sardine stock immediately before the next fishing season for each fishing plan.
The fishers want the largest possible catch without reducing the sardine stock.
Evaluate which fishing plan should be used.
In your answer, explain how repeatedly using a plan that reduces the stock could affect the breeding population and future catches.
87 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.