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• W3048303732 abstract "Abstract Background Aquaculture successfully meets global food demands for many fish species. However, aquaculture production of Atlantic cod ( Gadus morhua ) is modest in comparison to market demand. For cod farming to be a viable economic venture specific challenges on how to increase growth, health and farming productivity need to be addressed. Feed ingredients play a key role here. Macroalgae (seaweeds) have been suggested as a functional feed supplement with both health and economic benefits for terrestrial farmed animals and fish. The impact of such dietary supplements to cod gut integrity and microbiota, which contribute to overall fish robustness is unknown. The objective of this study was to supplement the diet of juvenile Atlantic cod with macroalgae and determine the impacts on fish condition and growth, gut morphology and hindgut microbiota composition (16S rRNA amplicon sequencing). Fish were fed one of three diets: control (no macroalgal inclusion), 10% inclusion of either egg wrack ( Ascophyllum nodosum ) or sea lettuce ( Ulva rigida ) macroalgae in a 12-week trial. Results The results demonstrated there was no significant difference in fish condition, gut morphology or hindgut microbiota between the U. rigida supplemented fish group and the control group at any time-point. This contrasts with the A. nodosum treatment. Fish within this group were further categorised as either ‘Normal’ or ‘Lower Growth’. ‘Lower Growth’ individuals found the diet unpalatable resulting in reduced weight and condition factor combined with an altered gut morphology and microbiome relative to the other treatments. Excluding this group, our results show that the hindgut microbiota was largely driven by temporal pressures with the microbial communities becoming more similar over time irrespective of dietary treatment. The core microbiome at the final time-point consisted of the orders Vibrionales ( Vibrio and Photobacterium ), Bacteroidales ( Bacteroidetes and Macellibacteroides ) and Clostridiales ( Lachnoclostridium ). Conclusions Our study indicates that U. rigida macroalgae can be supplemented at 10% inclusion levels in the diet of juvenile farmed Atlantic cod without any impact on fish condition or hindgut microbial community structure. We also conclude that 10% dietary inclusion of A. nodosum is not a suitable feed supplement in a farmed cod diet." @default.
• W3048303732 created "2020-08-13" @default.
• W3048303732 creator A5009439493 @default.
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• W3048303732 creator A5080614714 @default.
• W3048303732 date "2020-08-10" @default.
• W3048303732 modified "2023-09-30" @default.
• W3048303732 title "Temporal changes in the gut microbiota in farmed Atlantic cod (<i>Gadus morhua</i>) outweigh the response to diet supplementation with macroalgae" @default.
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