The NGO analyzed a sample of almost 150 cans from 15 European supermarkets. One in 10 cans tested showed mercury levels above the authorized limits for fresh tuna.

Europeans consume an average of 2.8 kg of tuna annually, primarily in canned form, which according to Bloom contains two to three times more mercury than fresh tuna. The European standard currently allows a maximum mercury level of one part per million, Euronews reported.

Under current EU law, the limit for mercury in tuna is 1.0mg/kg but for other species such as cod the threshold is 0.3mg/kg. Bloom and Foodwatch have also requested that EU member states "activate a safeguard clause" to prevent the sale and promotion of products exceeding that 0.3mg/kg mercury level.

Two environmental groups have raised alarm over high mercury concentrations in canned tuna sold across major European supermarkets

French NGOs are raising the alarm about mercury concentration in canned tuna after an investigation found the metal in all samples taken.View on euronews

Canned tuna in Europe has a high mercury concentration, exceeding the limit for other fish, according to a new report from the Paris-based NGO Bloom, which focuses on preserving the marine environment,