The European sea bass, Dicentrarchus labrax, is a highly valued marine fish species.
The body length of European sea bass varies between individuals.
The table below shows data on the size of sea bass caught in one area of the North Sea during a scientific survey.
| Body length, xxx (mm) | Frequency |
|---|---|
| 150≤x<250150 \le x < 250150≤x<250 | 12 |
| 250≤x<350250 \le x < 350250≤x<350 | 52 |
| 350≤x<450350 \le x < 450350≤x<450 | 115 |
| 450≤x<550450 \le x < 550450≤x<550 | 140 |
| 550≤x<650550 \le x < 650550≤x<650 | 108 |
| 650≤x<850650 \le x < 850650≤x<850 | 50 |
Explain how to construct a suitable histogram to represent these data, specifying the required scales, labels, and the heights and widths of the bars.
Variation in organisms can be caused by genetic and environmental factors. Explain why the data shown in the table indicates that at least some of the variation in body length of the sea bass is caused by environmental factors.
It is vital that commercial fishing is managed sustainably to prevent population collapses.
Fish farming (aquaculture) is one potential solution to declining wild fish stocks.
List three other strategies that national or international authorities could implement to improve the sustainability of commercial marine fishing.
Suggest why international agreements are particularly crucial for achieving sustainable marine fishing.
