Abstract
Persian shallot is a member of the Alliaceae family and is known for its efficacy as antibacterial and immunostimulant effects, but its application in aquaculture is scarce. Herein, we evaluated the effects of Persian shallot powder (PSP) on the growth performance, blood biochemistry profile, and immune response of rainbow trout. Fish fed dietary PSP at 0, 0.5, 1, and 2% for 56 days, then the growth, serum, and skin mucus indices were evaluated. The final weight, weight gain, and specific growth rate (SGR) were meaningfully enhanced in fish fed 1 and 2%. The voluntary feed intake and protein efficiency ratio were meaningfully higher, while the feed conversion ratio (FCR) was lower in rainbow trout-fed dietary PSP at 1% than the control. The regression analysis illustrated that the optimum dose of PSP powder according to the FCR and SGR results is 1.27–1.35% for rainbow trout. The protease, amylase, and lipase activities were meaningfully increased in rainbow trout-fed PSP powder in a dose-dependent manner. The blood glucose was significantly reduced in fish fed 1 and 2% of PSP than the control. Further, the lactate dehydrogenase was markedly decreased by dietary PSP regardless of the dose. The total serum protein, lysozyme activity, total immunoglobulin (Ig), and complement component C4 were markedly higher in rainbow trout-fed PSP at 1 and 2% than the control. Additionally, the serum complement component C3 is higher in rainbow trout fed 1% PSP than the other groups. The skin mucus total protein level was significantly higher in fish fed PSP at varying levels than the control, and fish fed 1% PSP levels had higher Ig than fish fed 0.5 and 2% levels. The lysozyme and protease activities in the skin mucus samples were higher in fish fed 1 and 2% levels than fish fed 0 and 0.5% levels. The skin mucus Ig is higher in rainbow trout fed 1% PSP than fish fed 0 and 0.5% without difference with 2%. Overall, we recommend the dietary administration of PSP to bolster the performance and immunity of rainbow trout.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
