Why will galvanized containers kill clams?
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Galvanized metals are dipped in a hot zinc bath. The resulting zinc coating prevents rusting.
https://university.upstartfarmers.com/blog/be-careful-about-zinc-in-aquaponics
points out that zinc leaches into surrounding water and can poison fish.
https://www.sciencedirect.com/science/article/abs/pii/S0166445X06000361?via=ihub
says that the mechanism of toxicity is disrupting calcium metabolism.
So, the article you point to is quite likely correct: keeping clams in galvanized containers will poison them.
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