It almost goes without saying that everyone loves brightly colored fish. Unfortunately many fish owners don't realize that those colorful fish do not come by their brilliant hues naturally. Juicing, or artificially coloring fish using paints and dyes, has become quite widespread in the aquarium trade. Yet most owners are unaware that their fish have been altered. You might be surprised, and appalled, to discover which fish are artificially colored, and how it's done. Here are just a few of the practices used to color or mark fish to enhance their marketability. Unfortunately, new methods appear regularly.
How It's Done
Several methods are used to alter the color and appearance of tropical fish. Coloring fish stresses them and makes them more susceptible to disease. Young fish that are not fully grown are often stunted by the painting process. Others are not killed outright, but contract disease as a result and die later.
Some methods result in mortality rates as high as 80%. Many of the survivors will have an abbreviated life span. Nine out of ten painted fish will lose their coloration within a matter of months.
Colored Food - Young fish are fed treated foods that will temporarily tint them. Once they are no longer fed the treated food, they eventually lose their color. Unfortunately the dye they consume can negatively affect their growth and development.
Dye Injection - Needles are used to inject dye under the skin. Because only a small area is affected, the fish must be subjected to many punctures to achieve the desired effect. The popular painted glassfish are dyed this way, using florescent colored paints. Another recent fad is to use dye injection to tattoo patterns, such as hearts, on the fish. Fish that are injected often contract infections from the puncture sites.
Dipping - As barbaric as dye injections seem, this practice is even worse. The fish are first put into a caustic solution that strips off their protective outer slime coating. They are then dipped in dye, or injected with dyes, after which they are dipped in another chemical that irritates the flesh to stimulate re-growth of the slime coat. This method is very stressful, and has a high mortality rate.
Which Fish Are Painted
Painted Glassfish - Created by dye injecting the nearly colorless Indian Glassfish (Chanda ranga), these are one of the hottest selling and most brilliantly colored of the juiced fish. Their lack of color makes the fluorescent paint used to color them stand out very clearly. Although the color fades over time, it lasts long enough to catch the eye of unsuspecting customers. A large percentage of glassfish die during the painting process, and those that survive are extremely susceptible to infections.
Fruit Tetras - Created by dipping the White Skirt Tetra, an albino morph of the popular Black Skirt Tetra. They are usually painted pastel colors and given fruit names such as, strawberry tetra, blueberry tetra, grape tetra, or simply mixed fruit. Some marketers have gone so far as painting the fish special colors for holidays. For example, red and blue dye is used to create a patriotic colored fish for the fourth of July. Orange dyed versions are sold with naturally colored black fish during the Halloween season.
Jelly Beans & Bubblegum Parrots - These are painted versions of the Blood Parrot, a fish that is created by crossbreeding certain species of cichlids. The hybrid fish are dyed bright colors, such as blue, purple, green, and red. Like other dyed fish, many do not survive the process, and those that do often have a damaged immune system.
Blueberry Oscars - Albino Oscars are injected with dye to give them a brilliant blue color. Recently additional colors have appeared on the market, similar to the Jelly Bean Parrots.
Painted Corys - To make them more attractive to potential buyers, some corys are now being injected with dyes to color their tail or other parts of their body.
Painted Botias - Even though blue botias exist in nature, dyed specimens are now appearing on the market. They are dye injected to create a more brilliant blue, apparently to enhance their sale.
What can you do about it? Painted fish continue to exist because of demand. Next time you visit a pet shop, think twice about purchasing unusually colored fish. Every time someone purchases a painted, dyed, or tattooed fish, they unwittingly contribute to the continuation of this practice. Let shops that carry these fish know you do not approve by not buying those fish.