]> 2026-04-22T00:28:50+00:00 Case study:Restoration of Ingarskilanjoki River 500 en Approved Depth variation Re-introducing stones Introduction of gravel Creation of fish passes Improvement Fish: Abundance,,,,,,Improvement Fish: Abundance Centre for Economic Development, Transport and the Environment for Uusimaa Fenno-Scandian Shield No Yes Yes ,,,,,, Before restauration(photo.Harri Aulaskari)300.jpg Knutsinvirta ingarskilanjoki (photo.Harri Aulaskari).jpg Ingarskilanjoki River before restoration (photo: Harri Aulaskari) Knutsinvirta after restoration (photo: Harri Aulaskari) multiple designations across the site 60.081644584914,24.04953840741 Harri Centre for Economic Development, Transport and the Environment for Uusimaa Aulaskari Depth variation,Re-introducing stones, Introduction of gravel, Creation of fish passes,,Buffer strips, ,,,Participation in design,Information provision ,,,,,, 1081 ,,,,,, Restored Knutsinvirta (photo: Harri Aulaskari) Knutsinvirta ingarskilanjoki (photo.Harri Aulaskari).jpg 2002-01-01Z 2452275.5 Complete The Ingarskilanjoki River is 50 km long and runs into the Gulf of Finland. The Ingarskilanjoki River is the only river in Finland where the population of extremely endangered migrating sea trout (Salmo trutta) is natural, not from stocking. Due to flooding of the fields the river was straightened and dredged in 1988. The river was restored in 2002-2007 to recreate habitats for trout and its reproduction for the whole river length. The goal of the restoration was to increase the morphological diversity of the river by e.g. creating more variation of depths and meanders and adding gravel for fish spawning. The goal was also to enable the trout to migrate between the river and sea. In addition buffer strips were created to the catchment to decrease the nutrient loading from arable areas and to decrease turbidity of the river water. The local land owners and river side inhabitants were interviewed in order to take into account their opinions due to restoration. To ensure the recovery of the natural sea trout population, the trout fishing was prohibited in the river after the restoration. Before the dredging of the river, natural trout were caught and raised for further farming. After the dredging, the trouts that were caught from the natural population were stocked back into the river. However, because of the clearing and lost habitats, the reproduction of the trout had been weakened. The key success factor was that the decision of the preservation was made by the local fishing society. This is most likely the reason for that the fishing restriction has been obeyed which again has been crucial for balancing the reproduction and population of the sea trout. Since strict fishing restrictions, restorations and additional fish stockings, the local trout population has grown. These results shows that the restoration as a whole was succeeded. Restoration of Ingarskilanjoki River restoration of ingarskilanjoki river Ingarskilanjoki River Basin Buffer strips Ingarskilanjoki River ingarskilanjoki river Catchment of Ingarskilanjoki River catchment of ingarskilanjoki river 160 100 - 1000 km² Ingarskilanjoki River Habitat and biodiversity Participation in design Information provision 2007-01-01Z 2454101.5 2012-08-10T14:00:15Z 2456150.0835069 2017-06-02T08:35:57Z 2457906.8582986 Restoration of Ingarskilanjoki River 500 1 plainlist 5 [[Category:Case study]] [[Project title::!Restoration of Ingarskilanjoki River]] [[Subcatchment title::Ingarskilanjoki River]] Restoration of Ingarskilanjoki River# QUERY6196a89ab0b9af8c962bad11fbdac2ba 500 1 list 3 [[Category:Case study]] [[Parent project::Case study:Restoration of Ingarskilanjoki River]] Restoration of Ingarskilanjoki River# QUERYbfcf2cb6e5bd2c03b1d0893d5bc0d375