Such is the beauty of these little jewel-like fish that when the first neon tetras became available to fishkeepers in the 1930s, they changed hands for the equivalent of a month’s pay.
Some look for example the regular Mexican tetras; some are part of the method shaded and can see well; others appear to be identical as the dejected of vision give in fish. One of the most popular species is not kept for its color or its beauty, however, but as a zoological oddity. Occurringin a dark cave system in the San Luis de Potosi area of Mexico is a small, eyeless, pink-bodied fish known as the blind cave characin. Above the caverns exists a brilliant Mexican tetra of comparable size, which can see well.
