The salmon stock of the River Kymi has been enhanced by stocking and the densities of wild-born salmon juveniles have increased in recent years. Estimates of the smolt production of the River Kymi before hydropower plants were built vary between 250,000 and 420,000 fish. The smolt production potential of the Kymi in its current state has been estimated at between 100,000 and 300,000 per year.
The original salmon stock of the River Kymi was destroyed in the 20th century as a result of dam constructions and industrial wastewater discharges. Efficient wastewater treatment techniques have improved water quality in the river. Some of the industrial plants along the river have also closed down in recent years. Today, the salmon that spawn in the River Kymi originate from the nearby River Neva stock, which has been used for hatchery-rearing and stocking into the river since the end of the 1970s.
Approximately 3 tonnes of salmon was fished from the Kymi in 2014. All fishing in the drainage basin is recreational fishing.
Research and monitoring
In addition to studies and monitoring run by Luke, the regional water protection association carries out regular mandatory monitoring. The information is used to regulate salmon fishing in the Gulf of Finland and also to assess the effectiveness of actions aimed at restoring migratory fish populations in the river. The information is used by, among others, the International Council for the Exploration of the Sea (ICES) and Finnish fisheries authorities.
Picture on top of the page: Panu Orell