Genetic diversity and phenotypic characterization of Iodobacter limnosediminis associated with skin lesions in freshwater fish

Abstract

Bacterial colonization of fish surfaces greatly reflects the surrounding aquatic environment, and fish harbour several commensal species. Sometimes, these environmental and commensal bacteria can become opportunistic pathogens. For example, Flavobacterium spp. are frequently found in the aquatic environment and on the surfaces of healthy fish, especially on the gills, but have also been reported as a prevalent cause of fish diseases in freshwater salmonid aquaculture (Austin, 2006;Loch & Faisal, 2015). Indeed, it is not always obvious whether bacteria from the fish microflora are synergistic, commensal or pathogenic and in the carrier stage. The health status and immunity of fish, as well as changes in environmental conditions and bacterial virulence, play a role in

Fish disease and intestinal microbiota: A close and indivisible relationship

“…22 Salmonids are frequently affected by saprolegniosis caused by Saprolegnia spp., an opportunistic pathogen that attacks the skin and immunocompromises the fish. 79 Nevertheless, oomycetes have been reported in Atlantic salmon eggs, in correlation with the gram-positive bacterium Actinobacteria; these bacteria reduce the incidence of saprolegniosis caused by Saprolegnia. 80 On the other hand, Oomycetes were found in the teleost skin microbiome with a 0.73% relative abundance.…”

“…Some oomycetes have been reported to have pathogenic agents in fish, causing significant losses in aquaculture; the most common oomycete reported in fish is Saprolegnia 22 . Salmonids are frequently affected by saprolegniosis caused by Saprolegnia spp., an opportunistic pathogen that attacks the skin and immunocompromises the fish 79 . Nevertheless, oomycetes have been reported in Atlantic salmon eggs, in correlation with the gram‐positive bacterium Actinobacteria; these bacteria reduce the incidence of saprolegniosis caused by Saprolegnia 80 .…”

Matrix-assisted laser desorption ionization-time-of-flight mass spectrometry in veterinary medicine: Recent advances (2019–present)

“…After training a reference library with known samples, the authors identified Tenacibaculum finnmarkense and Tenacibaculum ulcerans in 13/15 and 7/15 outbreaks of ulcerative lesions on the western coast of Norway. Korkea-Aho et al [18] used MALDI-TOF to identify Iodobacter limnosediminis present in samples of freshwater fish in Finland. This species is associated Bovine mastitis; prevalence of various causative organisms [36]…”