Evolutionary ecology
Master thesis

Can guppies hold their breath? Yes!

Geetha has successfully defended her thesis on the effect of ambient oxygen on the life history of guppies.

A lady standing beside a whiteboard with powerpoint presentation
Geetha Jeyakanth presenting her Master thesis.
Beatriz Diaz Pauli

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A year ago, Geetha Jeyakanth set out to answer the question "Can guppies hold their breath?" Now we know better! The answer is resounding yes, but not without consequences. Geetha's work has shown that guppies tolerate low levels of oxygen remarkable well, but this leads to earlier maturation at smaller sizes. Surprisingly though, their growth was unaffected. This all is documented in her Master thesis Effect of ambient oxygen on the life history of guppies (Poecilia reticulata), which she successfully defended on January 6. The external examiner was Professor Gunilla Rosenqvist from the Norwegian University of Science and Technology (NTNU, Trondheim).

The project has been collaboration between EvoFish and Fisheries Ecology and Aquaculture groups, supervised by Beatriz Diaz Pauli and Mikko Heino from EvoFish and Jeppe Kolding from FEA.