A fishing authority changed the controls for catching haddock in one fishing area. Scientists used the same survey method to estimate the number of adult haddock in 2020 and 2024.
| Year | Fishing quota for haddock / tonnes | Minimum permitted net mesh size / mm | Estimated number of adult haddock / millions |
|---|---|---|---|
| 2020 | 18 000 | 80 | 42 |
| 2024 | 12 000 | 100 | 61 |
Give one change in the controls for catching haddock between 2020 and 2024.
Suggest how one of the changes in the controls could have caused the estimated number of adult haddock to increase.
Suggest one disadvantage of the changes in the controls for the fishing industry.
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.