Abstract
To investigate the effects of different levels of fermented antarctic krill shell (FAKS) on the growth performance, hemolymph biochemistry, hepatopancreatic antioxidant capacity, and digestive enzyme activities of Macrobrachium nipponense, five isonitrogenous and isoenergetic experimental diets containing different proportions of FAKS (0 %, 0.25 %, 0.5 %, 1.0 %, 2.0 %) were fed to M. nipponense for 8 weeks. The results showed the weight gain rate (WGR), specific growth rate (SGR), head-to-body ratio (H/S), and head-to-tail ratio (H/T) increased first and then decreased with higher proportions of FAKS. The FAKS1.0 group exhibited the highest values, and significantly higher than that of the FAKS0 group (P < 0.05). Compared with the control group, FAKS inclusion could increase the concentration of hemolymph albumin (ALB), and reduce the concentration of alkaline phosphatase (ALP) (P < 0.05). The concentration of alanine aminotransferase (ALT) and aspartate aminotransferase (AST) were significantly lower in the FAKS1.0 group (P < 0.05). The hepatopancreas trypsin (TPS) concentration in the FAKS1.0 group, and the lipoprotein lipase (LPL) concentration in the FAKS0.25, FAKS0.5 and FAKS1.0 groups were significantly higher than that in other groups respectively (P < 0.05). With increasing proportions of FAKS, the activity of superoxide dismutase (SOD), glutathione peroxidase (GSH-Px), and ceruloplasmin (CP) in the hepatopancreas tended to increase and then decrease, and were significantly higher in the FAKS0.5 group than that in the FAKS0 group (P < 0.05). The concentration of malondialdehyde (MDA) in the FAKS0.25, FAKS0.5 and FAKS1.0 groups was significantly lower than that in the FAKS0 group (P < 0.05). In conclusion, adding a certain level of FAKS to the feed significantly improved the growth performance, digestive enzyme, and antioxidant enzyme activity of M. nipponense. Based on the quadratic regression curve fitting, the optimal WGR and SGR can be achieved when the proportion of dietary FAKS is 1.140 % and 1.149 %, respectively.
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.
