Effects of varying levels of dietary vitamin E (α-tocopherol) on growth performance, proximate and fatty acid composition of juvenile silver pomfret (Pampus argenteus Euphrasen, 1788)

Abstract

Summary This study investigated the effects of elevated dietary levels of vitamin E (α‐tocopherol) on growth performance, proximate composition and fatty acid profiles of juvenile silver pomfret, Pampus argenteus. Three semi‐purified experimental diets were formulated to contain 49% protein and 16% lipid. High docosahexaenoic acid (DHA) tuna oil was added to the diets to supplement DHA. A graded level of vitamin E (0‐, 50‐, and 100 mg kg−1) was added to experimental diets 1 to 3, respectively. Analyzed vit. E levels were 155.2, 195.3 and 236.4 mg kg−1 in diets 1, 2 and 3, respectively. The experiment was conducted for 12 weeks with juvenile silver pomfret (29.6 ± 7.6 g) using a flow‐through system consisting of nine 1‐m3 tanks. Each treatment had three replicates and fish were stocked at the rate of 20 m−3. Growth performance and feed utilization parameters of fish fed diets 2 and 3 were significantly (P < 0.05) higher than in fish fed diet 1, but the parameters in diets 2 and 3 did not differ significantly (P > 0.05). Although whole body protein levels were not influenced by the dietary vit. E levels, whole body lipid in fish fed diet 2 was significantly higher than in fish fed the other diets. The whole body vit. E levels in fish fed diet 2 (22.6 mg kg−1) and diet 3 (24.1 mg kg−1) were significantly (P < 0.05) higher than in those fed diet 1 (18.2 mg kg−1). Whole body total saturated fatty acids were significantly lower, and DHA levels higher in fish fed diets 2 and 3 than those fed diet 1. The results of the present study suggest that increasing dietary supplementation of vit. E in high lipid diets enhances the growth performance of fish and that a dietary level of 196 mg kg−1 vit. E is suitable for the growth of silver pomfret.

Evaluation of dietary vitamin E supplementation on growth performance and antioxidant status in hybrid snakehead (Channa argus × Channa maculata )

“…Equally, some studies also showed that the dietary vitamin E supplementation does not affect the whole body composition in fish (Li et al., ; Zhou et al., ). However, body lipid increased significantly in silver pomfret fed a diet with 50 mg kg −1 supplemental vitamin E (Hossain et al., ) and in tilapia fed a diet with 100 mg kg −1 vitamin E (Lim, Yildirim‐Aksoy, Li, Welker, & Klesius, ). This phenomenon requires further study.…”

“…Vitamin E (α‐tocopherol, α‐Toc) has long been known as an essential nutritional factor for animal, which plays an important role in many physiological and biochemical processes, including growth, development, reproduction and immune response (Lu et al., ; NRC ), as well as the oxidative stress (Prieto, Pichardo, Jos, Moreno, & Cameán, ; Gao et al., ; Guzmán‐Guillén, Prieto Ortega, Martín‐Caméan, & Cameán, ) and flesh quality (Halver, ; Hossain, Almatar, & Yaseen, ; Ruff, Fitzgerald, Cross, Hamre, & Kerry, ). However, vitamin E cannot be synthesized by fish based on its dietary intake (Li & Gatlin, ).…”

Influence of dietary vitamin E (DL‐alpha‐tocopheryl acetate) and diludine (diethyl 1,4‐dihydro‐2,6‐dimethyl‐3,5‐pyridinedicarboxylate) levels on growth and lipid peroxidation in rainbow trout, Oncorhynchus mykiss

“…Likewise, dietary vitamin E did not cause any difference in whole body lipid content in meagre (Rodríguez Lozano et al, 2017) and channel catfish, Ictalurus punctatus (Lim et al, 2010). On the other hand, dietary vitamin E increased the lipid level in silver pomfret (Pampus argenteus) body at 50 mg/kg dietary level but there was no effect when fish was fed at 100 mg/kg of dietary vitamin E (Hossain et al, 2016).…”