Abstract

An understanding of egg densities and juvenile production is critical in salmonid egg stocking projects, but the question is not deeply studied. Given that managers rely on the number of young of the year (YOY) fish to evaluate stocking success, this knowledge gap poses a major challenge. We studied effects of two stocking levels on YOY brown trout at different downstream distances (0-600 m) from the stocking point. Density increased significantly with increasing distance from the stocking point when 60,000 eggs were stocked but not when 30,000 eggs were stocked. Body length was not related to distance from the stocking point and only moderately negatively related to density. We conclude that the results of egg stocking can be difficult to interpret because site-specific density may vary with distance from the stocking point and the number of eggs stocked.

Keywords

alevin; discharge; dispersal; ova; salmonid; Vindelriver

Published in

Fisheries Management and Ecology
2024, Volume: 31, number: 1, article number: e12658
Publisher: WILEY

SLU Authors

• Palm, Daniel

  • Department of Wildlife, Fish and Environmental Studies, Swedish University of Agricultural Sciences
    

• Losee, James

  • Department of Wildlife, Fish and Environmental Studies, Swedish University of Agricultural Sciences
    
  • Washington Department of Fish and Wildlife

• Holmgren, Annika

  • Department of Wildlife, Fish and Environmental Studies, Swedish University of Agricultural Sciences
    

• Englund, Jan-Eric

  • Department of Biosystems and Technology, Swedish University of Agricultural Sciences
    

• Hellström, Gustav

  • Department of Wildlife, Fish and Environmental Studies, Swedish University of Agricultural Sciences
    

UKÄ Subject classification

Fish and Aquacultural Science


Publication identifier

DOI: https://doi.org/10.1111/fme.12658

Permanent link to this page (URI)

https://res.slu.se/id/publ/126492