Dietary effects of poly-β-hydroxybutyrate on the growth performance, digestive enzyme activity, body composition, mineral uptake and bacterial challenge of rainbow trout fry (Oncorhynchus mykiss)

This study investigated the effects of diet supplementation with poly-beta-hydroxybutyrate (PHB) on growth performance, digestive enzyme activity, lipid metabolism, mineral uptake and bacterial challenge of the rainbow trout fry (initial weight: 111.3 +/- 13.7 mg) during a 6-week experimental period...

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Bibliographic Details
Published in:Aquaculture Nutrition
Main Authors: Najdegerami, EH, Bakhshi, F, Tokmechi, A, Harzevili, A Shiri, Sorgeloos, Patrick, Bossier, Peter
Format: Article in Journal/Newspaper
Language:English
Published: 2017
Subjects:
Biology and Life Sciences
SALVELINUS-ALPINUS L
BETA-HYDROXYBUTYRATE
FRUCTO-OLIGOSACCHARIDES
MANNAN OLIGOSACCHARIDES
MICROBIAL COMMUNITY
LIVER HISTOLOGY
ARCTIC
CHARR
FATTY-ACID
SEA BREAM
LARVAE
digestive enzyme
immune system
poly-beta-hydroxybutyrate
rainbow
trout
short-chain fatty acid
Arctic
Arctic charr
Salvelinus alpinus
Online Access:https://biblio.ugent.be/publication/8548021
http://hdl.handle.net/1854/LU-8548021
https://doi.org/10.1111/anu.12386
https://biblio.ugent.be/publication/8548021/file/8548022
Description
Summary:This study investigated the effects of diet supplementation with poly-beta-hydroxybutyrate (PHB) on growth performance, digestive enzyme activity, lipid metabolism, mineral uptake and bacterial challenge of the rainbow trout fry (initial weight: 111.3 +/- 13.7 mg) during a 6-week experimental period. In the experimental set-up, the commercial diet of rainbow trout fry was replaced with 0.5%, 1% and 2% PHB. The results of our work showed that the replacing of diets with PHB in experimental treatments decreases the weight of rainbow trout fry during the first 2 weeks before significantly increasing final weight at the end of the 6-week period. PHB also improved digestive enzyme activity in experimental treatments. The highest total protease, pepsin activity and pancreatic enzyme secretion were observed with the 0.5% PHB treatment. A higher concentration of Na and K was observed in the whole body of the fry fed on 1% and 2% PHB-supplemented diets. Enhanced survival rates occurred in all groups of fry after bath exposure to Yersinia ruckeri compared to rates in those fed the control diet. Our results suggest that the diet supplemented with PHB may improve growth performance, digestive enzyme activity and the functioning of the immune system. These positive effects could be considered for new applications in aquaculture.

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