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Immunostimulatory and growth-promoting potential of poly-β-hydroxybutyrate in rainbow trout (Oncorhynchus mykiss) fingerlings culture
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E.H. Najdegerami *   |
| Department of Biology, Facultu of Science, Urmia University, Urmia, Iran , e.gerami55@gmail.com |
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Abstract: (2761 Views) |
| In the current study, the effect of dietary supplementation of poly-β-hydroxybutyrate (PHB) on growth performance, digestive enzymes activity, body composition, non-specific immune response and diseases resistance of rainbow trout fingerlings were investigated. Five hundred and fifty-two healthy fingerlings (8.2±1.0 g) were randomly distributed in 12 tanks (150 L) at a density of 46 fish/ tank and fed different levels of dietary PHB (0, 0.5, 1 and 2%) for 70 days. At the end of the experiment, the results showed that PHB affected growth performance and the fish fed 0.5 and 1% PHB diets had a significant higher weight gain and specific growth rate (SGR) than the control (p<0.05). The specific activity for total protease and amylase in 1% PHB was significantly higher than that of both the control and 2% PHB (p<0.05). In addition, PHB significantly affected the muscle fatty acids profile but did not change protein and lipid content. Also, our results indicated that 1 and 2% PHB markedly decreased cumulative mortality of the fingerlings challenged by Yersinia ruckeri infection. Overall, the results of this experiment revealed that PHB acts as a growth promoter and immunostimulator in rainbow trout fingerlings and the optimal PHB level in trout diet was estimated at 1% PHB. |
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| Keywords: Poly-β-hydroxybutyrate, Growth promoter, Rainbow trout, Immune response, Yersinia ruckeri |
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Full-Text [PDF 413 kb]
(1387 Downloads)
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Type of Study: Orginal research papers |
Subject:
aquaculture
Received: 2017/05/22 | Accepted: 2018/11/24 | Published: 2020/03/20
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