Supermarket gives away free fish

Cod, salmon, prawns, tuna and haddock make up around 80% of the fish we eat in the UK.

If consumption keeps up at current levels, there'll be none left by 2050.

But how easy is it to buy more sustainable types of fish?

On Friday Sainsburys will offer customers who ask for one of those 'Big Five', an alternative, lesser known species to try out for free.

Toby Middleton, is the UK head of the Marine Stewardship Council and told BBC Breakfast that people should think about eating herring or mackerel.

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