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It is a well-known fact that predation can be a keyfactor for many fish populations and in some areas predation may even be themost important regulating factor for fish stocks of major recreationalimportance. Several species of predators were earlier persecuted, but are nowprotected and have experienced high population growths recently. This includesspecies like: cormorant, grey heron, seals and otter. Thus, the protection ofthese species has been a conservation success, but has also caused severeconflicts between various user-groups. To handle and mitigate these conflicts,scientific documentation is severely needed. 

During a long period, DTU Aqua has carried out anumber of projects that directly or as side-results have assessed the magnitudeof predation and its impact on various fish stocks. This has provided someinsight in when, where and by whom the important recreational fish species arebeing eaten. This project gathered and synthesized this knowledge to provide anoverview of the significance of predation.


- Synthesis and analyses of existing knowledge/results.

- Method evaluation for scanning for PIT tags in cormorant/heron colonies.

- Investigations of possible causes for the recent drastic decline in grayling (Thymallus thymallus) populations.

The project was funded by the Danish Rod and Net Fishing License Funds.



  • Research area: Freshwater Fisheries and Ecology
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ID: 2287338