The Nifes study showed that farmed salmon had lower levels of most environmental pollutants than wild salmon, including dioxins, PCBs and pesticides.

Salmon overtaken cod as UK's favourite fish

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Cod, a chip shop staple for 200 years, was pushed into second place ahead of tuna, with haddock fourth and prawns fifth, the Daily Mail reports

Salmon jumped to the top of the list because it is seen as more fashionable – and because the price of cod is rising.

It has also benefited from a general trend towards eating fish as a part of a healthier diet.

The survey found that two-thirds of respondents believe that ordering salmon in restaurants was a sign of being 'more refined'.

Almost a third of people eat fish three or four times a week, with the average household tucking in at least twice.

One in 20 have stayed loyal to the traditional Friday supper of fish and chips.

Kevin Steppe, of pub restaurant chain Chef and Brewer, which carried out the study, said: 'Cod and chips is an iconic British meal.

'It will always remain a favourite, but it's refreshing to hear that families are experimenting with different kinds of seafood.

'Dishes like smoked salmon and sushi have always had an upmarket image but they are becoming increasingly commonplace.'

The poll of 2,000 Britons found 60 per cent of households eat more fish now than five years ago.

Major attractions are its health benefits and being simple and quick to cook.