]> 2026-04-22T07:56:18+00:00 Case study:Restoration for fishery in the river Hammonjoki 500 en Approved Centre for Economic Development, Transport and the Environment for Uusimaa No No Yes false Hammonjoki Koveroisenkoski.JPG River Hammonjoki 3.JPG River Hammonjoki 2.JPG Rapid area of the Koveroinen (photo: Kasvio). River Hammonjoki (photo: Kasvio) River Hammonjoki (photo: Kasvio) Yes 61.058264602794,25.366959571838 Kasvio Esa Centre for Economic Development, Transport and the Environment for Uusimaa Lehtinen ,, ,,, 12194 Restored area in the rapids of Koveroinen (photo Pinja Kasvio) River Hammonjoki.JPG Complete The river Hammonjoki was restored from seven different rapid sections by the end of year 2007. The source of the water in the river comes mainly from springs. Catchment area is 45 km2 and the river runs to the lake Vesijärvi. The river is highly appreciated among the fly fishers. The restoration plan was made in the Centre for Economic, Transport and the Environment of Uusimaa. Hämeen TE-Centre, The County of Hollola and the fishing ground of Lake Vesijärvi funded the project and there were plenty of volunteers working in the river during restoration work. Previously the connectivity of the river was blocked by an old mill dam. The old dam is protected by the ‘National Board of Antiquities and Historical Monuments’ and it was not permitted to take it down totally, but it was possible to explode a hole into the dam to enable the fish migration. The bypass was constructed to the rapid section year 2007. The river Hammonjoki inhabits populations of e.g. brown trout, brook trout, grayling and brook lamprey. It is the only river in the catchment area of Lake Vesijärvi where the trout can migrate to. The water quality is the best in the regoin because most of the water is produced through the springs. Brown trout is the only natural salmonid species of the river and is mainly found from the lower parts of the river. Brook trout is the most common species and abundant in the whole river, also in the small headwaters. Brook trout population originates from the fish farm upstream (Hatsina) stockings made in 1960´s. Recently there has also been seen stocking of rainbow trout for fisheries. The river Hammonjoki has had a distinct fishing section for fly fishing since 1990´s. Restoration for fishery in the river Hammonjoki restoration for fishery in the river hammonjoki Yes Brown trout (Salmo trutta) Brook trout grayling (Thymallus thymallus) brook lamprey (Lampetra planeri) Fisheries Habitat and biodiversity 2013-12-18T12:48:11Z 2456645.0334607 2013-12-18T13:17:02Z 2456645.0534954 Restoration for fishery in the river Hammonjoki