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As a philospher once said, there are three things in the world that smell like fish. One of them is fish.

What connects these three things that gives them this particular, characteristic smell? What chemical exactly do we smell?

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closed as unclear what you're asking by Jan, Klaus-Dieter Warzecha, Todd Minehardt, hBy2Py, M.A.R. ಠ_ಠ Jan 30 '16 at 17:18

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    $\begingroup$ Small alkyl amines, particularly trimethylamine. $\endgroup$ – bon Jan 29 '16 at 19:40

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