Debaryomyces hansenii and Rhodotorula mucilaginosa comprised the yeast core gut microbiota of wild and reared carnivorous salmonids, croaker and yellowtail

Abstract

This is the first study using molecular and culture-based methods aimed at investigating the composition of the intestinal yeast microbiota of wild and reared carnivorous salmonids, croaker and yellowtail, to characterize their cores and to evaluate the enzymatic activities of the cultivated yeast. Among 103 samples from salmonids, croaker and yellowtail, yeast were detected in 85.4%, with 43 species identified. The core of reared fish was composed of eight species, in contrast to the wild fish core, which consisted of two species: Debaryomyces hansenii and Rhodotorula mucilaginosa. Despite the smaller diversity of the wild fish core, similar enzymatic profiles were detected for the species from the wild and reared cores. For principal component analysis, samples grouped together independently of host species, domestication status and location. A high proportion of yeast produced aminopeptidases and lipases, which may be explained by the high proportion of protein and lipids in the carnivorous diet. This study reveals the presence of a yeast community in the fish gut that appears to be strongly shaped by a carnivorous diet. Yeast in the gut increases the repertoire of microorganisms interacting with the host intestine, which could influence health and disease.

Conventional Identification of Pathogenic Fungi Isolated from Fresh Water Aquarium Fish (O. niloticus and C. gariepinus) Combined with Molecular Identification of Saprolegnia parasitica in Egypt

“…A total of 6 samples (skin/fins, gills, eyes, and internal organs; liver, kidney, and spleen) from each fish species were taken for mycological analysis. Each sample was inoculated onto Sabouraud's dextrose agar with chloramphenicol (SCG Laboratorios CONDA, S.A. Cat.No.1090) (Eissa et al, 2013;Raggi et al, 2014). Then, they were incubated at 28±2 ºC for 3-10 days.…”

Description of four Apiotrichum and two Cutaneotrichosporon species isolated from guano samples from bat-inhabited caves in Japan

“…Notably, ‘ T. akiyoshidainum ’ HP2023 has been reported to have dye-decolourizing activity [16, 20] and a draft genome of the strain has already been determined. Although C. middelhovenii has been isolated from fish microbiota and panda skin, this species is unlikely to exhibit pathogenicity because it cannot grow at 30 °C [21, 22]. To date, A. chiropterorum has been isolated only from caves (see ).…”

The radiation resistance and cobalt biosorption activity of yeast strains isolated from the Lanyu low-level radioactive waste repository in Taiwan

“…Marine yeasts are involved in several ecological processes in the sea, and especially in estuarine and near shore environments; they are part of the microbiota of marine and aquacultural animals (Burgaud et al, 2010;Gatesoupe, 2007). Yeast has been identified as part of the normal microbiota of both wild and farmed fish (Bruce and Morris, 1973;Laconi and Pompei, 2007;Raggi et al, 2014). The transfer of radionuclides through marine ecosystems and food chains to man has been investigated (Brown, 2000).…”