Niels Gerner Andersen. Photo: Mikal Schlosser

Doctoral defence on the food intake of predatory fish

Wednesday 11 Jan 23

Time & place

Thursday 19 January 2023, 14.00

DTU, Anker Engelunds Vej, 2800 Kgs. Lyngby, building 101, meeting room 1

The defence will be streamed on

Senior Researcher Niels Gerner Andersen, DTU Aqua, will defend his doctoral thesis on a model of gastric evacuation in predatory fish on 19 January 2023 at DTU in Lyngby. The defence will also be streamed.

Predatory fish preying on fish comprise a major structuring force in fish communities and have the potential to exert control on entire ecosystems. Therefore, inclusion of species interactions in fish stock assessment and fishery management calls for accurate quantification of the predator food intake and the associated prey mortality.

The food intake is estimated from stomach contents of representatively sampled predators combined with the gastric evacuation rate of the contents. However, research on gastric evacuation rate has been sparse and uncoordinated, and predictions of previous gastric evacuation rate models disparate.

Based on comprehensive experiments, Niels Gerner Andersen has established a new mechanistic gastric evacuation rate model for predatory fish. Subsequent tests have confirmed the generic ability of the model to predict the course and rate of evacuation of individual prey in predatory fish under natural conditions.

Niels Gerner Andersen has complied his results in a doctoral thesis, “The dynamics of gastric evacuation in predatory fish; A mechanistic model of gastric evacuation – development and applications in fish and fishery biology”, which he is now going to defend.

Time and place

The defence takes place on Thursday 19 January 2023, 14.00 at DTU, Anker Engelunds Vej 101, 2800 Kgs. Lyngby, building 101, meeting room 1.

You can also follow the defence online:

The defence will open with a presentation by Niels Gerner Andersen before the opponents start questioning. There will be a reception after the defence.

The defence proceeding is chaired by provost Rasmus Larsen, DTU.


The official opponents are: 

  • Professor Brian MacKenzie, DTU Aqua (chair)
  • Professor Jorge Santos, UiT The Arctic University of Norway
  • Professor Axel Temming, Universität Hamburg

Unofficial opponents can sign up in advance at or announce their contribition at the defence.

The doctoral thesis

The doctoral thesis can be downloaded from DTU Orbit