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Why will galvanized containers kill clams?

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Please see the sentences to the right of my red vertical line, in the scan below.

Jennifer Trainer Thompson, Fresh Fish 2016, p 41.

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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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