Haddock from the North Sea and the west of Scotland have been taken off a the Marine Conservation Society's (MCS') sustainable "fish to eat" list, reports BBC News.
It was downgraded in the MCS Good Fish Guide after stock numbers fell.
Haddock is one of the UK's "big five" seafood species along with cod, tuna, salmon and shrimp, and a favorite at the country's fish and chip shops.
But haddock from three North Sea and West of Scotland fisheries is no longer on the MCS's recommended "green" list of fish to eat.
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