Galvani in the 1700s famously showed that a dead frog can be made to twitch by electric stimulation. The hind legs are particularly susceptible. Salt helps in the activation, as shown in these videos: https://www.youtube.com/watch?v=sJifWqUa2pY https://www.youtube.com/watch?v=2YZJt_Bw3eo Can the same be accomplished with a fresh dead fish? Fish are more easily available for demonstrations to children. Have you tried this, and if so which part of the fish is most readily stimulated?
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4$\begingroup$ This is quite immediately post-mortem; we aren't talking grocery store frogs, if that's what you're thinking. $\endgroup$– Bryan Krause ♦Jun 17, 2022 at 2:26
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With fish, the hearts can be stimulated to beat just by prodding them.
Learnt a long time ago, preparing fresh fish given to me by others.
answered Jun 17, 2022 at 3:59
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3$\begingroup$ Works with mammals, including humans, too. $\endgroup$– Bryan Krause ♦Jun 17, 2022 at 13:51