:: دوره 19، شماره 2 - ( 1398 ) ::
جلد 19 شماره 2 صفحات 847-865 برگشت به فهرست نسخه ها
Immunostimulatory and growth-promoting potential of poly-β-hydroxybutyrate in rainbow trout (Oncorhynchus mykiss) fingerlings culture
چکیده:   (960 مشاهده)
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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نوع مطالعه: پژوهشي | موضوع مقاله: aquaculture
دریافت: 1396/3/1 | پذیرش: 1397/9/3 | انتشار: 1399/1/1


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دوره 19، شماره 2 - ( 1398 ) برگشت به فهرست نسخه ها