Nanopore environmental DNA sequencing of catch water for estimating species composition in demersal bottom trawl fisheries

AbstractBycatch and discards, representing unwanted catches, undermine sustainable fisheries and hinder the conservation of vulnerable and endangered species. To effectively monitor bycatch and enhance the effectiveness of management measures while promoting sustainable fishing practices, reliable data is essential. Here, we explore the use of Nanopore metabarcoding to analyze the catch composition in demersal bottom fisheries. We collected eDNA samples directly from an onboard catch holding tank (catch water) for 10 fishing hauls from a fishing vessel operating in the Skagerrak (North‐East Atlantic). The approach involved sequencing a combination of long (~2 kb) and short (~170–313 bp) mitochondrial amplicons and was validated by analyzing a fishery‐related mock community sample and fishing haul replicates. Overall, the detection rate accuracy was 95% for landed species, and replicates obtained from the same fishing haul showed consistent results, validating the robustness of this approach. The detection rate accuracy for all caught species observed on board (including the non‐landed fraction) was 81%. Undetected species were always limited to species in low abundance, but may also be attributed to problems with identifying closely related species due to the impact of sequencing errors and limited diagnostic variation in the genetic regions used. In the future, such biases may be reduced by using additional markers to increase species discrimination power and applying newly available technological advantages in flow cell chemistry to improve sequencing accuracy. In conclusion, this study demonstrates the effectiveness of Nanopore eDNA sequencing of catch water for estimating species composition in demersal bottom trawl fisheries, including catches of non‐commercial and threatened and vulnerable species, without disrupting fishing activities. Incorporating eDNA analysis of catch water may therefore help facilitate effective monitoring, leading to better‐informed fisheries management, biodiversity conservation efforts, and the implementation of relevant legislation such as the EU landing obligation.

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Published: May 01, 2024
Vol/Issue: 6(3)
License: View

Authors

S

Sara Maggini

Molecular Ecology and Evolution at Bangor, School of Natural Sciences Bangor University Bangor UK

M

Magnus Wulff Jacobsen

Section for Marine Living Resources, National Institute of Aquatic Resources (DTU Aqua) Technical University of Denmark Silkeborg Denmark

P

Paulina Urban

Section for Marine Living Resources, National Institute of Aquatic Resources (DTU Aqua) Technical University of Denmark Silkeborg Denmark

B

Brian Klitgaard Hansen

Section for Marine Living Resources, National Institute of Aquatic Resources (DTU Aqua) Technical University of Denmark Silkeborg Denmark

J

Jos Kielgast

Section for Marine Living Resources, National Institute of Aquatic Resources (DTU Aqua) Technical University of Denmark Silkeborg Denmark

D

Dorte Bekkevold

Section for Marine Living Resources, National Institute of Aquatic Resources (DTU Aqua) Technical University of Denmark Silkeborg Denmark

E

Ernesto Jardim

Marine Stewardship Council London UK

J

Jann T. Martinsohn

European Commission, Joint Research Centre (JRC), Directorate D – Sustainable Resources, Unit D2 – Ocean and Water Ispra Italy

G

Gary R. Carvalho

Molecular Ecology and Evolution at Bangor, School of Natural Sciences Bangor University Bangor UK

E

Einar E. Nielsen

Section for Marine Living Resources, National Institute of Aquatic Resources (DTU Aqua) Technical University of Denmark Silkeborg Denmark

A

Alexander S. T. Papadopulos

Molecular Ecology and Evolution at Bangor, School of Natural Sciences Bangor University Bangor UK

Funding

Horizon 2020 Framework Programme Award: 773713

Miljø- og Fødevareministeriet Award: 33112‐I‐19

Cite This Article

Sara Maggini, Magnus Wulff Jacobsen, Paulina Urban, et al. (2024). Nanopore environmental DNA sequencing of catch water for estimating species composition in demersal bottom trawl fisheries. Environmental DNA, 6(3). https://doi.org/10.1002/edn3.555

Nanopore environmental DNA sequencing of catch water for estimating species composition in demersal bottom trawl fisheries

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