Low-level pathogen transmission from wild to farmed salmonids in a flow-through fish farm

0549513 - ÚBO 2022 RIV HU eng J - Journal Article
Pravdová, Markéta - Ondračková, Markéta - Palíková, M. - Papežíková, I. - Kvach, Yuriy - Jurajda, Pavel - Bartáková, Veronika - Seidlová, V. - Němcová, M. - Mareš, J.
Low-level pathogen transmission from wild to farmed salmonids in a flow-through fish farm.
Acta Veterinaria Hungarica. Roč. 69, č. 4 (2021), s. 338-346. ISSN 0236-6290. E-ISSN 1588-2705
Institutional support: RVO:68081766
Keywords : rainbow trout * brown trout * parasites * bacteria * freshwater fish farm
OECD category: Fishery
Impact factor: 0.959, year: 2021
Method of publishing: Limited access
https://akjournals.com/view/journals/004/69/4/article-p338.xml

While the potential effects of pathogens spread from farmed fish to wild populations have frequently been studied, evidence for the transmission of parasites from wild to farmed fish is scarce. In the present study, we evaluated natural bacterial and parasitic infections in brown trout (Salmo trutta m. fario) collected from the Cerna Opava river (Czech Republic) as a potential source of infections for rainbow trout (Oncorhynchus mykiss) reared in a flow-through farm system fed by the same river. The prevalence of bacterial and protozoan infections in farmed fish was comparable, or higher, than for riverine fish. Despite this, none of the infected farmed fish showed any signs of severe diseases. Substantial differences in metazoan parasite infections were observed between wild and farmed fish regarding monogeneans, adult trematodes, nematodes, the myxozoan Tetracapsuloides bryosalmonae found in riverine fish only, and larval eye-fluke trematodes sporadically found in fanned fish. The different distribution of metazoan parasites between brown and rainbow trout most probably reflects the availability of infected intermediate hosts in the two habitats. Despite the river being the main water source for the farm, there was no significant threat of parasite infection to the farmed fish from naturally infected riverine fish.
Permanent Link: http://hdl.handle.net/11104/0325510