Where can cold water fish survive hot summers? (Bachelor/Master)

Last changed: 17 February 2022

How large part of Lake Mälaren have cold enough water and at the same time good oxygen conditions för cold water species to thrive? I this project, you'll find out and present the results with GIS-maps.

Like many other fish in Sweden, vendace is a cold water species that avoids hot summer surface water. In the summer, it is found in deep water that stays cold thanks to the temperature stratification. Access to cold deep water with good oxygen conditions can be a limiting factor for the size of the population.

In Lake Mälaren there are several basins deep enough for cold water species. In recent years, we have measured temperature and oxygen profiles in detail at several stations during the summer. It is now time to evaluate these data in a cold water species perspective and examine how temperature and oxygen profiles vary during the summer, between years and between different parts of the lake.

In this project, you'll use the depth profiles with oxygen and temperature data with GIS to calculate the possible distribution area of the vendace during the summer in Lake Mälaren. Comparisons with data on where the fish are located are also possible. Since you will be using GIS, you need to have taken a GIS course to do this project.

The project is a collaboration between the SLU departments Aquatic Sciences and Assessment and Aquatic Resources.

Supervisors Stina Drakare (Vatten och miljö) and Björn Rogell (Akvatiska resurser).


  • Main subject area: Biology or Environmental Science
  • Level: Basic (Bachelor) or Advanced (Master)
  • Length: 15 credits/ 10 weeks (basic level) or 30 credits/20 weeks (advanced level)