Zebrafish embryos move spontaneously. In fish expressing anion channelrhodopsin, green light induces paralysis.
Video by @GadistiAisha pic.twitter.com/GhgxKbbpG5

— Adam Claridge-Chang (@adamcchang) July 5, 2017

Optogenetic inhibition with anion channelrhodopsins enables rapid, reversible silencing of neural circuits for the analysis of behavior in zebrafish.