Seafood lovers are being warned their fishy feasts could contain high levels of radiation.

New research has found concentrated levels of radiation in some of New Zealand's favourite seafood - including Bluff oysters, skipjack tuna, greenshell mussels, paua, queen scallop, rock lobster and littleneck clams.

Chemical contaminants in seafood can cause significant health problems, the researchers said. If eating fish is culturally important to you, or you rely on fishing and shellfish collection to feed your family, you're most at risk.

The 2011 Fukushima meltdown is most likely not to blame for the radiation, the researchers said.

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They found levels are the same here as in other countries, suggesting it's a result of global nuclear testing.