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Related Experiment Video

Updated: Jul 9, 2026

Effectiveness of the Air Stripping in Two Salmonid Fish, Rainbow Trout (Oncorhynchus Mykiss) and Brown Trout (Salmo Trutta Morpha fario)

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Published on: September 16, 2018

High Levels of Straying in Returning, Repeat-Spawning Atlantic Salmon Between Two Neighbouring Danish Rivers.

Hugo Flávio^1,2, Lene Klubben Sortland^1,3, Kim Birnie-Gauvin¹

¹National Institute of Aquatic Resources Technical University of Denmark Silkeborg Denmark.

Ecology and Evolution

|July 8, 2026

Summary

Atlantic salmon (Salmo salar) migration studies show that while most return to their home river, some stray. This research in River Skjern found high straying rates in returning kelts, impacting population counts.

Keywords:

acoustic telemetry kelt marine survival return migration

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Published on: July 20, 2017

Area of Science:

Ecology
Fisheries Science
Animal Behavior

Background:

Atlantic salmon (Salmo salar) exhibit remarkable homing instincts, returning to natal rivers after ocean migration.
Straying, or returning to non-natal rivers, occurs in a small proportion of salmon populations.
Understanding migration patterns is crucial for effective fisheries management and conservation efforts.

Purpose of the Study:

To investigate the seaward and return migration of Atlantic salmon kelts from wild and hatchery origins.
To assess survival rates and identify factors influencing migration success and straying behavior.
To evaluate the implications of observed straying rates on population monitoring and management.

Main Methods:

Capture, tagging, and release of Atlantic salmon kelts (wild and hatchery-originated) in River Skjern, Denmark.
Monitoring of fish survival and ocean migration using tagging data.
Recording of return migration, including instances of straying into neighboring river systems.

Main Results:

Of 199 tagged kelts, 110 (55%) reached the ocean.
Wild-spawned kelts released in the river showed higher survival (65.6%) compared to hatchery-reared kelts (20%).
Seven out of 10 returning kelts (four wild, three stocked) strayed into a neighboring river, indicating a high straying rate.

Conclusions:

High straying rates in returning Atlantic salmon kelts were observed in the River Skjern system.
Potential causes for increased straying include age-related decline in homing ability, migration route, or hatchery rearing practices.
Observed straying rates raise concerns for accurate population assessments and fisheries management, especially in stocked rivers.