British cod, herring and whiting should be off the menu, study says Six in 10 of our most popular fish are overfished, the NGO said, with many favourite species overfished and at risk of stock collapse 22 January 2021 • 6:00am Britain's fishing stocks are in a sorry state, NGO Oceana has said Credit: VICKIE FLORES/EPA-EFE/Shutterstock British consumers should avoid fish and shellfish from our waters including all cod, and types of scallop and crab, a new report from a marine campaign group has found. NGO Oceana has assessed Britain's fishing stocks found that six in 10 of our most popular fish are overfished.