Effects of dietary vitamin E level on growth performance, feed utilization, antioxidant capacity and nonspecific immunity of largemouth bass,Micropterus salmoides

Abstract

An 8‐week feeding trial was conducted to explore the optimal dietary vitamin E requirement of largemouth bass. The fish (7.54 ± 0.04 g) were fed diets containing grade level of vitamin E, 14.24 (the basal diet), 79.53, 118.70, 176.32 and 225.32 mg/kg diet, to apparent satiation twice daily. Results showed that the supplementation of vitamin E significantly enhanced the specific growth rate, which may be related to the elevated feed intake, feed efficiency ratio and protein efficiency ratio. The increase of dietary vitamin E from 14.24 to 118.70 mg/kg diet significantly increased the activity of total superoxide dismutase, consistent with the variation of liver vitamin E content. However, the supplementation of vitamin E significantly decreased the malondialdehyde content. The activity of lysozyme, respiratory burst activity and classical complement pathway were all improved with the supplementation of vitamin E, and fish fed the diet with 118.70 mg/kg vitamin E obtained the highest value. Meanwhile, the red blood cell and haemoglobin followed the similar pattern with the above nonspecific immune indexes. Based on the above results, the optimal dietary vitamin E should be estimated to be 73–108 mg/kg diet through the analysis of broken‐line regression.

Interactive effects of dietary Nano selenium and vitamin E on growth, haematology, innate immune responses, antioxidant status and muscle composition of rainbow trout under high rearing density

“…Previous studies have revealed the role of vitamin E in regulating the stress response in fish (Belo et al, ; Montero et al, ; Trenzado et al, ). Moreover, the beneficial role of vitamin E on growth and feed utilization of fish has been reported (Li et al, ; Liu et al, ; Suárez et al, ; Trenzado et al, ). In the present study, final weight, WG and feed intake were significantly higher in fish fed diets supplemented with vitamin E (Vit E and Combination groups) as compared to other groups.…”

“…The diet of the Vitamin E group was supplemented with an additional 500 mg vitamin E (DL‐α‐tocopherol acetate; Sigma Chemicals) per kg diet. The supplemental levels of vitamin E were selected based on the earlier studies that high levels of vitamin E may improve immunity and stress resistance in fish (Chen et al, ; Li et al, , ; Liu et al, ; Montero et al, ; Niu et al, ; Ortuño et al, ). The Combination (Nano Se plus vitamin E) diet was supplemented with 1 mg Nano Se and 500 mg vitamin E per kg diet.…”

“…To neutralize the harmful effects of ROS, fish have developed a complex antioxidant system that includes antioxidant enzymes (Halliwell & Gutteridge, ), minerals and vitamins. Fish species may acquire antioxidant compounds they cannot synthesize, such as selenium (Se) and vitamin E, through their feed (Biller‐Takahashi, Takahashi, Mingatto, & Urbinati, ; Li, Lian, Chen, Wang, & Sang, ). Moreover, coping with chronic stress condition imposes an energy and metabolic cost that may interfere with the needs of the immune function in farmed fish, and therefore, the chances of an disease may be increased (Andrade et al, ; Nardocci et al, ; Tort, ).…”

Effect of dietary vitamin E on growth, immunity and regulation of hepatopancreas nutrition in male oriental river prawn, Macrobrachium nipponense

“…Besides, vitamin E plays an important role in modulation of immune response, such as elevating lysozyme activity (Zhou et al, ), hydrolase enzyme activity (Li et al, ) and respiratory burst activity (Lu et al, ). The antioxidation and immune response of vitamin E has been observed in many aquatic animals, especially in fish, such as largemouth bass, Micropterus salmoides (Li, Lian, Chen, Wang, & Sang, ), yellow catfish, Pelteobagrus fulvidraco (Lu et al, ) and grass carp, Ctenopharyngodon idellus (Li et al, ). However, few studies have been done on crustaceans.…”

Dietary vitamin E requirement of sub‐adult genetically improved farmed tilapia strain of Nile tilapia (Oreochromis niloticus) reared in freshwater

“…A summary on the vitamin E requirements of fish indicated that the levels vary from 25 to 200 mg vitamin E/kg of the diet (NRC, ). For example, the vitamin E requirement for largemouth bass ( Micropterus salmoides ; Li, Lian, Chen, Wang, & Sang, ), red drum ( Sciaenopsocellatus ; Peng & Gatlin, ), Atlantic salmon ( Salmo salar ; Hamre & Lie, ), mrigal ( Cirrhinusmrigala ; Paul, Sarkar, & Mohanty, ), rohu ( Labeorohita ; Sau, Paul, Mohanta, & Mohanty, ) and black sea bream ( Acanthopagrusschlegeli ; Peng et al, ) was 73–108, 31, 60, 99, 131.91 and 150 mg/kg, respectively.…”