Ichtyological inventory using environmental DNA and fisheries in the middle course of the Comoé river (Côte d’Ivoire)
Paper Details
Ichtyological inventory using environmental DNA and fisheries in the middle course of the Comoé river (Côte d’Ivoire)
Abstract
This study aims to demonstrate the complementarity between traditional fishing methods and environmental DNA in establishing a fish stock sampling of the middle Comoé river. This study was conducted quarterly in the middle of the Comoé River from March 2021 to March 2022 using traditional fishing methods and environmental DNA (eDNA). Traditional methods consisted of using monofilament nets, multifilament, traditional traps and hooks. Gillnets were used at 57.8%, followed by traps at 42% and hooks at 0.2% to obtain the stand. The use of eDNA consisted of filtering 730 ml of water. The filtrate was stored and transported to the laboratory, then extracted, amplified and sequenced. Data was processed using bioinformatics. The inventory of the environment yielded 103 species. For experimental and commercial fisheries, 29 species and 32 species of fish were respectively identified. The eDNA has revealed 76 species, including 37 families, 74 genera and 43 identified species. The eDNA allowed having 55.47% of all species harvested, 23.36% for commercial fishing and 21.17% for experimental fishing. The eDNA method reduces the effort, time, resources and costs involved in sampling. Also, through the reliable genetic reference base, species identification is easier and faster.
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