File(s) under permanent embargo
Atlantic salmon (Salmo salar L.) gastrointestinal microbial community dynamics in relation to digesta properties and diet
journal contribution
posted on 2023-05-18, 17:53 authored by Zarkasi, KZ, Taylor, RS, Abell, GCJ, Mark TamplinMark Tamplin, Glencross, BD, John BowmanJohn BowmanTo better understand salmon GI tract microbial community dynamics in relation to diet, a feeding trial was performed utilising diets with different proportions of fish meal, protein, lipid and energy levels. Salmon gut dysfunction has been associated with the occurrence of casts, or an empty hind gut. A categorical scoring system describing expressed digesta consistency was evaluated in relation to GI tract community structure. Faster growing fish generally had lower faecal scores while the diet cohorts showed minor differences in faecal score though the overall lowest scores were observed with a low protein, low energy diet. The GI tract bacterial communities were highly dynamic over time with the low protein, low energy diet associated with the most divergent community structure. This included transiently increased abundance of anaerobic (Bacteroidia and Clostridia) during January and February, and facultatively anaerobic (lactic acid bacteria) taxa from February onwards. The digesta had enriched populations of these groups in relation to faecal cast samples. The majority of samples (60–86 %) across all diet cohorts were eventually dominated by the genus Aliivibrio. The results suggest that an interaction between time of sampling and diet is most strongly related to community structure. Digesta categorization revealed microbes involved with metabolism of diet components change progressively over time and could be a useful system to assess feeding responses.
Funding
Australian Seafood Cooperative Research Centre
Tassal Operations Pty Ltd
History
Publication title
Microbial EcologyVolume
71Pagination
589-603ISSN
0095-3628Department/School
Tasmanian Institute of Agriculture (TIA)Publisher
Springer New York LLCPlace of publication
United StatesRights statement
Copyright 2016 Springer Science+Business Media New YorkRepository Status
- Restricted