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(thelemmy.club)
A place for majestic STEMLORD peacocking, as well as memes about the realities of working in a lab.

Rules
This is a science community. We use the Dawkins definition of meme.
Seeing as this is about salmon, it's probably more relevant to ask about the concentration in rivers. A river downstream from a reasonable size city likely has a not insignificant level. I assume the ocean is effectively nothing though.