This guide provides a comprehensive identification framework for the freshwater fish species inhabiting the rivers, lakes, and streams of Britain and Europe. The authors, Bent J. Muus and Preben Dahlstrom, utilize their expertise in marine biology and natural history to catalog the diverse aquatic life across the continent. The text serves as a systematic reference for researchers, anglers, and naturalists, organizing species by family and physical characteristics to facilitate accurate field identification.

The text is regarded as a foundational reference for European ichthyology, valued for its systematic approach and clear visual documentation. Its technical density and focus on morphological accuracy make it a standard resource for both academic study and field observation.