This unique lexicon covers all known species of freshwater stingrays in their entire variety. For the first time in the history of the aquarium literature, you now have a complete reference work in which the South American river stingrays (Potamotrygonidae), as well as the Asian, African, Australian, and North American freshwater species are presented. The sawfishes are included completely. The species from all over the world, visiting brackish water, are introduced in addition.