The gut microbiome of farmed Arctic char () is shaped by feeding stage and nutrient presence.

The gut microbiome plays an important role in maintaining health and productivity of farmed fish. However, the functional role of most gut microorganisms remains unknown. Identifying the stable members of the gut microbiota and understanding their functional roles could aid in the selection of positive traits or act as a proxy for fish health in aquaculture.

Impact of Putative Probiotics on Growth, Behavior, and the Gut Microbiome of Farmed Arctic Char ().

Beneficial bacteria promise to promote the health and productivity of farmed fish species. However, the impact on host physiology is largely strain-dependent, and studies on Arctic char (), a commercially farmed salmonid species, are lacking. In this study, 10 candidate probiotic strains were subjected to assays, small-scale growth trials, and behavioral analysis with juvenile Arctic char to examine the impact of probiotic supplementation on fish growth, behavior and the gut microbiome.

Polyphasic analysis of Thermus isolates from geothermal areas in Iceland.

Genetic relationships and diversity of 101 Thermus isolates from different geothermal regions in Iceland were investigated by using multilocus enzyme electrophoresis (MLEE) and small subunit ribosomal rRNA (SSU rRNA) sequence analysis. Ten polymorphic enzymes were used and seven distinct and genetically highly divergent lineages of Thermus were observed. Six of seven lineages could be assigned to species whose names have been validated.