- Farm-Raised Fish May Not Be Free of Mercury and Other Pollutants: Aquaculture fish, usually fed a controlled diet, are generally less exposed to mercury than their wild, free-foraging cousins. But because they are raised in the ocean they can still absorb mercury, PCBs and dioxins https://www.scientificamerican.com/article/farm-raised-fish-not-free-mercury-pcb-dioxin/ 3 comments environment
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