Since this is fluorescence not luminescence, the detection would require at minimum a special light source and a filter. My first thought when seeing this was to wonder how they detect the fluorescence. According to the researchers this turned out to be “nontrivial.”
"Tadpoles aren't just going to sit still while you measure them. They're usually off and running."
Product literature available at the website of the company the researchers founded, WatchFrog, says that the method can be used to detect hormonal disruptors and heavy metals.