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Lahti Lakes 2021 Symposium

7.6.2021 - 9.6.2021

Lahti Lakes 2021 will take place in the European Green Capital city of Lahti on 7-9 June, 2021. The symposium is organized by the University of Helsinki together with Lake Vesijärvi Foundation and the International Society of Limnology (SIL) Working Group on Lake Restoration. Building on the success of Lahti Lakes 2018, we aim to bring together international experts to present the state of the art in science and management aspects of lake restoration. We also want to stimulate debate about future challenges, such as the impacts of environmental change and economic development on lake systems, and to foster discussion of best practices for lake restoration in the future.


The symposium is open to researchers and water managers working on all themes related to restoration of eutrophic lakes, including nutrient reduction strategies, biomanipulation, aeration, chemical treatment and hypolimnetic withdrawal, with an emphasis on understanding biogeochemical processes and implementing scientific knowledge into good management practice.

Fieldtrip on Lake Vesijärvi and social program

Lahti stands on the shores of Lake Vesijärvi, which has provided the people of the city with livelihood and amenities for generations. Although the lake was polluted in the 20th century, an intensive research and management effort has seen major improvements in water quality in recent decades. As part of a broad social program, the symposium includes a fieldtrip on the lake, during which local experts will explain how innovative restoration actions have been employed to manage water quality.


The symposium will take place at the Sibelius Hall in Lahti. This modern venue is named after the great Finnish composer Jean Sibelius (1865-1957) and hosts many cultural events as well as conferences and symposia. The symposium will take place over three days and will be open to 120 participants. Lahti in summer is lively and warm, with a good selection of hotels and restaurants close to the conference venue. The city can be easily reached from Helsinki-Vantaa international airport.


Pre-registration will be possible via the symposium website at from 01.09.2020 – 28.02.2021. Initially, we ask participants to pre-register and submit abstracts if they wish to make a presentation. Due to ongoing concerns about the Covid-19 pandemic, a final decision on the format of the symposium will be made in March 2021. After the decision is made, we will request payment of registration fees.

Visiting Finland

Finns speak excellent English, and Finland is a safe and easy country to travel around. The country has plentiful options for summer vacation activities, including in Lahti and surrounding region, in the capital Helsinki and in many national parks. For more information please see and

Special Issue publications from Lahti Lakes 2018

The Special Issue of Hydrobiologia “Restoration of eutrophic lakes: Current practices and future challenges” features original research articles based on presentations at Lahti Lakes 2018. Papers are published online immediately upon acceptance and are archived for open access at:




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Lahti, 15140
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