Understanding long-term population dynamics and behaviour of stationary and migratory brown trout for sustainable management
Purpose
This project is a continuation of the FOTS project ID 22993 in the Vatne and Fremstad watercourses started in 2014 and 2016, respectively. The main purpose of this study is to quantifying how trout (Salmo trutta) populations utilise the available habitats, both within freshwater and marine environments, in different reference watercourses.
Distress
The PIT tagging method represents a moderate procedure using very small tags in comparison to the body size of study animals. Duration of discomfort and possible pain is a few minutes, and is therefore defined as slightly stressful. The procedure will not cause any significant impairment to the well-being or general condition of the study animals.
Expected benefit
Long-term assessments of trout population dynamics in relation to multiple stressors from national reference watercourses helps to inform management strategies for sustainable management for all Norwegian brown/sea trout populations.
Number of animals, and what kind
In total up to 5000 migratory brown/sea trout will be tagged over a two year period across two reference watercourses.
How to adhere to 3R
Alternative study methods or models are not relevant for the study. The number of study animals is defined according to statistical calculations. Experimental conditions are optimized based on previous experience with this experiment type and similar studies at the sites.
This project is a continuation of the FOTS project ID 22993 in the Vatne and Fremstad watercourses started in 2014 and 2016, respectively. The main purpose of this study is to quantifying how trout (Salmo trutta) populations utilise the available habitats, both within freshwater and marine environments, in different reference watercourses.
Distress
The PIT tagging method represents a moderate procedure using very small tags in comparison to the body size of study animals. Duration of discomfort and possible pain is a few minutes, and is therefore defined as slightly stressful. The procedure will not cause any significant impairment to the well-being or general condition of the study animals.
Expected benefit
Long-term assessments of trout population dynamics in relation to multiple stressors from national reference watercourses helps to inform management strategies for sustainable management for all Norwegian brown/sea trout populations.
Number of animals, and what kind
In total up to 5000 migratory brown/sea trout will be tagged over a two year period across two reference watercourses.
How to adhere to 3R
Alternative study methods or models are not relevant for the study. The number of study animals is defined according to statistical calculations. Experimental conditions are optimized based on previous experience with this experiment type and similar studies at the sites.