In this project, nine coastal streams in Stockholm County were surveyed using eDNA. The study aimed to detect invasive alien species and map the presence of protected fish species under Swedish conservation programs (ÅGP), including asp (Aspius aspius), ide (Leuciscus idus), and vimba bream (Vimba vimba). Through strategic sampling upstream and downstream of existing migration barriers, the study also analyzed their impact on migratory fish populations.
The results indicate that several waterways require measures to improve upstream passage. Targeted interventions can enhance dispersal patterns and genetic diversity among many fish species.
The high detection capability of eDNA confirms its value as an efficient method for large-scale environmental monitoring. The study follows rigorous scientific methodologies and enhances knowledge of biodiversity, fisheries management, and ecosystem function in Swedish aquatic environments.