The national survey "Atlas of Danish Fishes" began in 2006. The project is carried out as a collaboration between the Natural History Museum of Denmark
(University of Copenhagen) and DTU Aqua (National Institute of Aquatic Resources, Technical University of Denmark
In the years 2006-2009, the survey focussed on gathering information on freshwater fishes. As a result of the first phase of the project, a comprehensive book (in Danish) was published in 2012: Atlas of Danish freshwater fishes, ISBN-13: 9788787519748.
Since 2009, mapping of saltwater fishes has first priority. Data is still collected on fish species occurrences in all Danish waters - both fresh and salt water. The Aage V. Jensen Foundations fund the project.
This dataset presents general occurrences of species of Danish fresh water fish, recorded in a given UTM quadrant, in a given year. UTM quadrants have been converted to a decimal degree lat-long center point with a coordinate uncertainty of 5km.