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GCSE Biology Human impact on the environment (AQA 9-1)

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Sustatinable Fishing

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Fish are an important part of the human diet, accounting for a worldwide average of 15 per cent of protein intake. Most of these fish are caught wild.

As the population has increased, so has the demand for fish. If fish are caught at a faster rate than the remaining fish can reproduce, the numbers of fish - the fish stock - will decline. Trying to harvest more fish than the sea can produce is an example of unsustainability.

North Sea cod have been overfished since the 1960s. Increasing numbers of boats - using increasingly sophisticated technology - were able to catch more and more cod. At first, catches continued to rise each year. However, the size of catches then started to decline as cod populations fell, leaving fewer and fewer breeding fish to maintain cod numbers.

In order to prevent the disappearance of certain fish species in some areas, it is important to maintain fish stocks at a level that allows breeding to occur and ensures that fish populations remain at a sustainable level. As a result of the near collapse of some fish populations, the European Union introduced regulations to conserve fish stocks.

These regulations included:

Setting fishing quotas for EU countries and for individual fishing vessels, which limited the amount of each species of fish which could be caught. By catching fewer fish, more are left to breed, so in time the population should recover.

Limiting mesh size of the nets. By increasing the size of the holes in nets, only mature, full-sized fish can be caught and immature fish can escape and eventually breed, allowing the population to recover.

In spite of these measures, stocks of cod and some other fish remain dangerously low.

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BBC - GCSE Bitesize Science - Food Production : Revision, Page 3

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Fish are an important part of the human diet, accounting for a worldwide average of 15 per cent of protein intake. Most of these fish are caught wild. As the population has increased, so has the demand for fish.

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Sustatinable Coffee Production

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Human Impacts on Biodiversity | Ecology and Environment | Biology | FuseSchool

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