In order to manage stocks of freshwater fish in the best possible way, you need to know time and place of spawning. The Freshwater Ecology & Inland Fisheries Laboratory at the Natural History Museum (NHM) in Oslo has collected fish eggs at different places during spring-time in the lower parts of the rivers Nitelva and Leira. The eggs were barcoded at NHM. With the help of the reference library of fresh water fishes, the eggs were determined to be asp, ide and roach. Asp and ide were found in Nitelva and in a side-river to Leira. Eggs of roach were identified from collections later in the season. This will aid the management of these fish species.

Asp. Photo: Henning Pavels. Text: Gunnhild Marthinsen.