Universiteit Leiden

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Research project

Clock disruption in diurnal versus nocturnal migrating fish

Does Artifical Light at Night (ALAN) disrupt seasonal physiological and behavioral patterns in migrating freshwater fish?

2021 - 2027
Christian Tudorache
  • Joke Meijer (LUMC) 
  • Jeroen Huisman (VHL) 
  • Martina Vijver (CML)


Our biological clock is disrupted by the 24-hour society in which we now live. The goal of the BioClock consortium is to restore and preserve the health of the biological clock. The plans cover the society as a whole: from human health and disease to the natural environment and protection of biodiversity. 
Within this consortium, we will study the mechanisms by which light pollution affects the behaviour and physiology of both diurnal and nocturnal migrating fish species. The specific objectives are to:
1. Determine the effects of light pollution on the robustness of the 24-hour rhythm in nocturnal and diurnal freshwater fishes. 
2. Determine the effects of nocturnal light on seasonal rhythms such as reproduction and migration; and
3. Implement prevention strategies in order to protect biodiversity.

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