Abstract
Atlantic salmon (Salmo salar) is consumed worldwide for its flavor and high nutritional value. However, because S. salar is difficult and costly to breed and has low yield, it remains difficult to meet the global demand. Rainbow trout (Oncorhynchus mykiss) is closely related to S. salar, and their flesh is similar in appearance. Because the price difference between these two fish species is large, O. mykiss is sometimes sold as S. salar to maximize profits, which is a violation of consumer rights and could pose health risks. Freshwater farmed O. mykiss is at higher risk of infection by parasites that can easily infect humans, whereas those carried by marine-cultured S. salar cannot. Thus, there is an urgent need for rapid, simple, and sensitive detection methods to differentiate these two species. In this study, we developed a method that combines isothermal recombinase polymerase amplification and lateral flow strip (RPA-LFS) to identify S. salar. A standard sample of S. salar was used as a template, and the myoglobin gene was selected as a target gene to establish the RPA-LFS detection method. Frozen fish samples were purchased online and analyzed using the RPA-LFS system; the results were compared with those obtained using PCR amplification and cytochrome oxidase I (COI) gene sequencing. The RPA-LFS system successfully performed amplification at 37 °C, and the entire detection process required approximately 20 min. The minimum detection limit was 102 ng/mL or 103 copies/mL. The detection results for clinical samples were consistent with those obtained using DNA barcoding technology (32/36). Together, these findings indicate that the detection system developed in this study is applicable for rapid, high-precision, sensitive identification of S. salar.







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Acknowledgements
The authors acknowledge the support of the Jiangsu Key Laboratory of Marine Pharmaceutical Compound Screening for the provision of standard material samples.
Funding
This study was funded by the Sericulture Industry Technology Research Institute, Agriculture Research System (CARS-18-ZJ0207), Zhenjiang Agricultural Technology (NY2018013), and Jiangsu University of Science and Technology (1732931603).
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Weiguo Zhao and Lei Wang designed the study. Lei Wang, Danyan Zheng, Huahua Wu, Shishi Qi, Xiangdong Xin, and Peng Guo conducted the research. Lei Wang, Michael Ackah, and Weiguo Zhao wrote the manuscript. Weiguo Zhao directed the project.
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Lei Wang declares no conflict of interest. Danyan Zheng declares no conflict of interest. Michael Ackah declares no conflict of interest. Huahua Wu declares no conflict of interest. Shishi Qi declares no conflict of interest. Xiangdong Xin declares no conflict of interest. Peng Guo declares no conflict of interest. Weiguo Zhao declares no conflict of interest.
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Lei Wang, Danyan Zheng, and Michael Ackah contributed equally to this work.
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Wang, L., Zheng, D., Ackah, M. et al. Rapid Identification of Salmo salar Using a Combined Isothermal Recombinase Polymerase Amplification–Lateral Flow Strip Approach. Food Anal. Methods 15, 401–412 (2022). https://doi.org/10.1007/s12161-021-02128-8
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DOI: https://doi.org/10.1007/s12161-021-02128-8


