Can mercury levels in fish change over time based on where you shop?
Yes. A 2025 analysis of mercury in fish from 2011-2021 found levels vary by species and change over time, making ongoing monitoring important.
What's actually in it
Methylmercury accumulates in fish from polluted waterways. Levels vary by species, location, and environmental conditions. Larger predatory fish like tuna, swordfish, and shark have the highest concentrations because mercury builds up through the food chain.
What the research says
A 2025 analysis in Environ Res tracked mercury levels in fish from 2011 to 2021 using advanced statistical methods. Mercury levels varied over time and across species. Some species showed declining trends while others remained stable or increased.
Choose low-mercury fish like salmon, sardines, and anchovies. Limit high-mercury species to once a week. Check local fish advisories for your region.
The research at a glance
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