[neurocat123]

This seems silly for another reason: these fish are genetically engineered to be fluorescent, which means that if you shine light on them at one frequency (typically UV-A light), they emit light at another frequency (red, green or blue). They are not luminescent, which is the spontaneous emission of light, like in fireflies. Lacking any UV light in the wild of nature, surely, they would hardly look any different from any ordinary fish.