Evaluation of potential transfer of the pathogen Saprolegnia parasitica between farmed salmonids and wild fish

Perla Tedesco*, Marcia Saraiva, Jose Vladimir Sandoval-Sierra, Maria Letizia Fioravanti, Benedetto Morandi, Javier Dieguez-Uribeondo, Pieter Van West, Roberta Galuppi

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Saprolegnia infections are among the main parasitic diseases affecting farmed salmonids. The distribution and potential transfer of Saprolegnia spp. between farms and the natural environment has been scarcely investigated. Therefore, this work aimed to study the diversity and abundance of oomycete species in salmonid farms, tributary water, and effluent water systems. Four trout farms in Italy and two Atlantic salmon farms in Scotland were considered. In Italian farms, 532 isolates of oomycetes were obtained from fish and water, at upstream, inside, and downstream the farms. In Scottish farms, 201 oomycetes isolates were obtained from water outside the farm and from fish and water inside the farming units. Isolates were identified to the species level through amplification and sequencing of the ITS rDNA region. In Italy, S. parasitica was significantly more present in farmed than in wild fish, while in water it was more frequently isolated from the wild, particularly in effluent systems, not associated with more frequent isolation of S. parasitica in wild fish downstream the farm. In Scotland, S. parasitica was the most prevalent species isolated from fish, while isolates from water were mostly Pythium spp. with few S. parasitica isolates from upstream and downstream the farms.

Original languageEnglish
Article number926
Number of pages16
JournalPathogens
Volume10
Issue number8
Early online date22 Jul 2021
DOIs
Publication statusPublished - 22 Jul 2021

Keywords

  • Italy
  • Oncorhynchus mykiss
  • Salmo marmoratus
  • Salmo salar
  • Salmo trutta
  • Salmonid farms
  • Saprolegnia parasitica
  • Scotland

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