The European Food Safety Alert System (RASFF) has issued a high-risk alert for frozen swordfish slices from Spain due to high mercury content. The detected mercury level of 1.5 mg/kg exceeds the safe limit of 1 mg/kg. Mercury, an environmental contaminant, can be harmful especially to pregnant and breastfeeding women, women planning to conceive, and children aged 0-14. Swordfish, along with emperor, bluefin tuna, shark, and pike, are known to have high mercury content. However, the general population is not advised to completely avoid eating any type of fish.