Whitefish are salmonoids, and they are common throughout the Kuusamo area. Local fishery collectives stock their waters actively with whitefish. There are several whitefish populations which can be separated by the number of secondary teeth in their grillrakers. The most common whitefish populations in Kuusamo are the Baltic whitefish, the European whitefish, the broad whitefish, and the maraena whitefish. Hybrids are also formed between different whitefish populations, and therefore an examination by a more experienced fisherman is sometimes needed to find out which kind of whitefish has been caught. The populations differ from each other mostly by the nutrition they choose to eat. The less secondary teeth the fish has, the larger and coarser food it prefers.
Whitefish are happy to eat many kinds of food. As fry they eat plankton, and when they are older, they eat water fleas, bottom-dwelling creatures, and small fish. The usual catch size of whitefish is approximately 30-35 cm, which it reaches in 4-5 years under normal nutritional circumstances.
However, there is no minimum size given for whitefish. Whitefish spawn in autumn, between
September and December. The spawning season is two to four weeks long. Whitefish often rise or descend to spawn in rivers and small brooks, sometimes even in small ditches, but they also spawn in lakes near rocky areas or shores. They spawn 0.5-5 metres under water in areas with gravel or sand bottom.