Project Details


This is an interdisciplinary project involving many of the Danish Universities. Its overall aim is to further our knowledge about optimal sustainable lake restoration and explore the potential for recycling of the nutrient phosphorus (P). P is on one side in access in many lakes, where it causes eutrophication and loss of biodiversity and on the other side P is becoming a scare resource globally as many P mines are running dry. 

In the first phase of the project, Lake Ormstrup has been selected as the test object. We want to know where the phosphorus is stored and in which form; the history of the lake; how much sediment can be removed; can it be used as fertiliser; how do the fish respond to the interventions; and what are the socio-economical consequences of the activities. Both the environment and the animals in and around the lake will be rigorously mapped and characterized in 2020, 2021 and 2021. 

In 2020 the lake underwent biomanipulation and over the next years researchers from the different universities will follow how the different trophic levels respond to this, and develop and test new lake restoration methods and technologies. 

DTU Aqua is in charge of a detailed monitoring the fish population in the lake including its density, feeding patterns, growth, recruitment and behavior. DTU Aqua is also in charge of collecting information that can improve future attempts to do biomanipulations by fish removal. 

To explore fish behavior, we use state of the art high‐resolution positional telemetry where we focus on both predatory and zooplanktivorus fish. Such detailed knowledge will allow us to better understand trophic relationships and interactions as well as further our knowledge about optimal lake restoration. 

A frequent tool in lake restoration is massive removals of planktivorous fish and with this study we aim to better understand when (season and time of day) it is optimal to remove the fish, i.e. are there times where they are easier to catch. We relate this to various fishing methods such as seining, gillnetting, electrofishing etc. Using state of the art technology we are, as the first in the world able to transmit the high resolution telemetry positions of the tagged fish in the lake "live", i.e. with less than two minutes delay, on a website ( We plan to include this as part of our research communication during the project.

DTU Aqua, National Institute of Aquatic Resources
Poul Due Jensen Foundation, Denmark (coordinator)
Southern University of Denmark, BioScience, Denmark
University of Aarhus, BioScience, Denmark
University of Copenhagen, Food and Resource Economics, Denmark

The project is funded by Poul Due Jensen Foundation. 

Research area: Freshwater Fisheries and Ecology

Effective start/end date01/01/202030/06/2023


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