Abstract
Saprolegnia parasitica induces heavy mortality in aquaculture. The detection of S. parasitica is often time consuming and uncertain, making it difficult to manage the disease. We validated a previously published real-time quantitative PCR (qPCR) assay to confirm the presence of S. parasitica in fish and in water using environmental DNA (eDNA) quantification. Analytical sensitivity and specificity of the assay was assessed in silico, in vitro and the qPCR assay was compared with microbiological cultivation methods to detect and quantify S. parasitica in water samples from a controlled fish exposure experiment and from fish farms. Furthermore, we compared the use of an agar cultivation method and the qPCR assay to detect S. parasitica directly from mucus samples taken from the fish surface. The analytical sensitivity and specificity of the qPCR assay were high. The qPCR assay detected 100% of S. parasitica-positive water samples. In a field study, the qPCR assay and a microwell plate (MWP) enumeration method correlated significantly. Furthermore, the qPCR assay could be used to confirm the presence of S. parasitica in skin mucus. Thus, the qPCR assay could complement diagnostic methods in specifically detecting saprolegniosis in fish and used as a surveillance method for S. parasitica pathogen in aquaculture environments.
Subject
Virology,Microbiology (medical),Microbiology
Reference35 articles.
1. Engblom, C., Landor, L., and Wiklund, T. Saprolegnia Infections in Finnish Fish Farms, Identification of Disease Agents. Åbo Akademi University. Research Report. 2022.
2. Saprolegnia species affecting the salmonid aquaculture in Chile and their associations with fish developmental stage;Sandoval-Sierra;Aquaculture,2014
3. Species composition of the genus Saprolegnia in fin fish aquaculture environments, as determined by nucleotide sequence analysis of the nuclear rDNA ITS regions;De la Bastide;Fungal Biol.,2015
4. Saprolegnia molecular phylogeny among farmed teleosts in Nova Scotia, Canada;Sarowar;J. Fish Dis.,2019
5. Tedesco, P., Saraiva, M., Sandoval-Sierra, J.V., Fioravanti, M.L., Morandi, B., Dieguez-Uribeondo, J., van West, P., and Galuppi, R. Evaluation of Potential Transfer of the Pathogen Saprolegnia parasitica between Farmed Salmonids and Wild Fish. Pathogens, 2021. 10.
Cited by
4 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献