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News 1145 views last update:7 Aug 2012

Fluorine from krill not accumulated in fish

Current EU regulations restrict the use of plankton, such as krill, as feed ingredients. This is because the EU claims that the fluorine present in these feed ingredients pose a risk to human health.

However, researchers at Norway's National Institute of Nutrition and Seafood Research (NIFES) showed that fluoride is not accumulated in the fillets of salmon that have been raised on krill meal-based feed with a fluoride content that is more than twice as high as the EU maximum limit of 150 mg per kg feed.

Corresponding feed trials were also carried out with cod and halibut. Atlantic cod were given feed containing 100% replacement of fish meal by Antarctic krill meal for 75 days. The feed fluoride level was five times higher than the EU maximum limit. Analyses of fillets showed that the amount of fluoride was approximately the same as in cod that had been given feed containing no krill meal. Nor was there fluoride in the fillet of halibut that had been fed on plankton-based feed with a fluoride content almost seven times higher than the EU maximum limit for fluorine in fish feed. The level of cadmium and copper was also measured in the feeding trials and no accumulation was found in the fish fillets.

Based on the fish feeding trials carried out at NIFES and other similar research, the European Commission is considering increasing the upper limit for fluoride in feed from 150 mg per kg to 350 mg per kg, while the maximum limit for cadmium has recently been increased.

Related website:
NIFES  

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