Glofish do not glow, they fluoresce under the right lighting thanks to the aforementioned coral and jellyfish genes
Tetras like glassfish are usually injected, as you can see by the spinal cord being filled with neon dye.
All opaque fish like cichlids are dipped in acid, then dyed all over with a stain.
There are no glow-in-the-dark fish on the market as of yet that I know of. Any references I've encountered failed to show any true light generation, only fluorescence. They would not be visible at night with the lights off like a glow-in-the-dark toy.
Tetras like glassfish are usually injected, as you can see by the spinal cord being filled with neon dye.
All opaque fish like cichlids are dipped in acid, then dyed all over with a stain.
There are no glow-in-the-dark fish on the market as of yet that I know of. Any references I've encountered failed to show any true light generation, only fluorescence. They would not be visible at night with the lights off like a glow-in-the-dark toy.