The glassy fish is a small species of fish known for its striking transparent or translucent flesh. The body adaptations of the fish are see-through and colorless and one can easily spot the bones and internal organs of the fish with the naked eye. Indian glassy fish sold to hobbyists have often been "painted", which involves injecting coloured dye into the fish's transparent tissue to make them more attractive to hobbyists. These coloured fish are often called "disco fish". Inexperienced fishkeepers are often tricked into believing such fish are natural or that the process is painless and causes no harm.