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

被引:1
作者
Maggini, Sara [1 ]
Jacobsen, Magnus Wulff [2 ]
Urban, Paulina [2 ]
Hansen, Brian Klitgaard [2 ]
Kielgast, Jos [2 ]
Bekkevold, Dorte [2 ]
Jardim, Ernesto [3 ]
Martinsohn, Jann T. [4 ]
Carvalho, Gary R. [1 ]
Nielsen, Einar E. [2 ]
Papadopulos, Alexander S. T. [1 ]
机构
[1] Bangor Univ, Sch Nat Sci, Mol Ecol & Evolut Bangor, Bangor, Wales
[2] Tech Univ Denmark, Natl Inst Aquat Resources DTU Aqua, Sect Marine Living Resources, Silkeborg, Denmark
[3] Marine Stewardship Council, London, England
[4] Joint Res Ctr JRC, European Commiss, Unit D2 Ocean & Water, Directorate D Sustainable Resources, Ispra, Italy
来源
ENVIRONMENTAL DNA | 2024年 / 6卷 / 03期
基金
欧盟地平线“2020”;
关键词
bottom trawling; bycatch and discards; eDNA; landing obligation; marine fish species; metabarcoding; monitoring; Nanopore sequencing; EDNA; PROTOCOL;
D O I
10.1002/edn3.555
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
Bycatch 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 (similar to 2 kb) and short (similar to 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.
引用
收藏
页数:16
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