"Animal and plant world of fresh waters. The first volume" is a publication that represents a very important information resource about the biodiversity of freshwater ecosystems. The authors - Forel F. A., Gruber August, Ludwig Friedrich, Migula V., Plate Ludwig, Vosseler Julius, Weltner Wilhelm - present the results of their own research and observations in this area. The book contains information about the variety of species of fish, algae, aquatic insects and plants that inhabit fresh water bodies. The publication contains numerous illustrations and descriptions that will contribute to a better understanding of the peculiarities of the life of aquatic organisms. "The Animal and Plant World of Fresh Waters. Volume One" will be a useful source of information for anyone interested in the nature and biology of aquatic systems.