The Rio Nanay is a large, left-bank tributary of the upper Amazon River. It is considered a blackwater river. The Rio Nanay is home to Green Discus, which have always been sought after in the hobby. In the past, in the 1950s and 1960s, these precious animals came to us via the Colombian city of Leticia, which is still a major hub for South American ornamental fish
 
Discus are and have always been relatively expensive fish, which is partly due to the fact that they have to be packed and transported individually and therefore there is only room for a few animals per box. This results in a high freight price. In addition, however, discus of all varieties and locality forms are also sorted in the country itself. Depending on rarity and demand, different prices for animals from the same locality arise. In the case of green discus from the Rio Nanay, specimens with many spots on the flanks are particularly sought after and therefore significantly more expensive than their cousins in which these spots are less numerous or missing.