Department of Biology

Aarhus University Seal

Eva Egelyng Sigsgaard

Species-specific detection and quantification of environmental DNA from marine fishes in the Baltic Sea

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaperJournal articleResearchpeer-review

  • Steen Wilhelm Knudsen, Amphi Consult ApS, Norwegian Institute for Water Research, University of Copenhagen
  • ,
  • Rasmus Bach Ebert, University of Copenhagen
  • ,
  • Martin Hesselsøe, Amphi Consult ApS, NIRAS Aarhus
  • ,
  • Franziska Kuntke, Amphi Consult ApS, Aalborg University
  • ,
  • Jakob Hassingboe, Amphi Consult ApS
  • ,
  • Peter Bondgaard Mortensen, Eurofins Miljø A/S
  • ,
  • Philip Francis Thomsen
  • Eva Egelyng Sigsgaard
  • Brian Klitgaard Hansen, Section for Marine Living Resources, Technical University of Denmark
  • ,
  • Einar Eg Nielsen, Technical University of Denmark
  • ,
  • Peter Rask Møller, University of Copenhagen

Biomass assesment of fish stocks is a difficult task that often involves costly fisheries trawl surveys. Trawl surveys rarely return replicate samples, as trawling attempts are expensive and difficult to reproduce. Furthermore, traditional benthic trawling is often detrimental to habitats and the organisms associated with the sea bottom. The rapidly developing field of environmental DNA (eDNA) analysis offers a new approach to non-invasive monitoring of fish. In the present study, we develop and test species-specific primers and probes for qPCR detection of eDNA from Atlantic herring (Clupea harengus), Atlantic cod (Gadus morhua), European flounder (Platichthys flesus), European plaice (Pleuronectes platessa), and Atlantic mackerel (Scomber scombrus) in the Baltic Sea. A recently published qPCR system was applied for European eel (Anguilla anguilla). Filtered water samples were collected during a stratified benthic trawl survey, enabling parallel comparisons of eDNA concentrations with biomass caught by trawling. No significant correlation was found between eDNA concentrations and the biomass of fish caught by the trawl, although an association was observed between the measured concentrations of eDNA and the known distributions and main abundances of cod, herring, plaice and flounder. This indicates that while eDNA concentrations may not be directly comparable to results from existing methods – likely because aquatic eDNA concentrations are not controlled by the same combinations of factors as e.g. trawl biomass catch – eDNA analysis could prove a useful supplement for monitoring fish stocks in the future.

Original languageEnglish
JournalJournal of Experimental Marine Biology and Ecology
Pages (from-to)31-45
Number of pages15
Publication statusPublished - 1 Jan 2019

    Research areas

  • eDNA, Fish stock monitoring, North Eastern Atlantic Ocean, qPCR

See relations at Aarhus University Citationformats

ID: 138147741