The effect of dietary vitamin E and C level on market-size turbot (Scophthalmus maximus ) fillet quality

Abstract

Fish fillet quality has been shown to be influenced by the level of antioxidants in preslaughter diet. Thus, an experiment was conducted to study the effect of different levels of vitamin E and C on the fillet quality of market-size reared turbot (Scophthalmus maximus). Turbot of a mean initial weight of 347 ± 20 g were divided into four groups and fed commercial turbot diets (60% protein, 12% fat), supplemented with a-tocopheryl acetate (mg kg )1 ) and ascorbyl-2 monophosphate (mg kg )1 ) at the following dietary levels: 500/100, 1000/ 100, 100/1000, 100/100 respectively. Over a dietary supplementation period of 15 weeks, fish were fed to satiation and reached a final mean weight of 916 ± 29 g. a-Tocopherol levels increased significantly (P < 0.001) in tissue (i.e. muscle, liver, heart and kidney) of fish fed diets containing elevated levels of a-tocopheryl acetate. In ice storage, fillets of these fish exhibited significantly lower (P < 0.001) levels of lipid oxidation, and showed significantly less (P < 0.001) colour deterioration (higher hue angle and lower chroma). Elevated dietary a-tocopheryl acetate levels had a negative effect (P £ 0.001) on the concentration of ascorbic acid in muscle tissue. An increase in dietary vitamin C did not have any detectable effect on fillet quality. Prolonged feeding times had a negative effect on lipid oxidation (P < 0.001) and colour deterioration (P < 0.01). These results suggest that increased dietary a-tocopheryl acetate could prevent colour deterioration and lipid oxidation of turbot fillets in retail storage on ice.KEY WORDS

The study of fillet proximate composition, growth performance and survival rate of striped catfish (Pangasius hypophthalmus) fed with diets containing different amounts of alpha-tocopherol (Vitamin-E)

“…Yildiz (2004) proved that the fillet Vitamin-E content of the fish reflected their dietary ATA levels. This positive correlation between dietary and fillet Vitamin-E content is also reported for rainbow trout and other aquaculture species such as Atlantic salmon, sea bass, turbot and Atlantic halibut show comparable results (Bjerkeng et al 1999, Ruff et. al.…”

“…Alpha-tocopherol acetate (ATA) is used as a vitamin-E source in fish feed in aquaculture, with the aim of improving fish growth (Hamre et al 1998, Kaushik et al, 1998, Huo et al 1999. The effects of including varying amounts of vitamin-E on the quality of fish fillet has been studied for several species such as Rainbow trout (Boggio et al 1985, Frigg et al 1990, Jensen et al, 1998, Chaiyapechara et al 2003, Channel catfish (Bai and Gatlin 1993), Sea bass , Atlantic salmon (Waagbo et al1993, Hamre et al 1998, Scaife et al 2000, turbot (Ruff et al 2003), Catfish (Lim et al 2001), Nile tilapia (Gammanpila et al 2007), Sunshine bass (Trushenski 1999) and hybrid Tilapia (Huang et al 2003).…”

Influence of Stress and Dietary Natural‐Source Vitamin E on Nonspecific Immunocompetence, Tissue Tocopherol Composition, and Postslaughter Fillet Oxidative Stability in Sunshine Bass

“…Tocopherols prevent free radical oxidation of lipids and fatty acids in vivo (Bell et al 2000); postslaughter, they can reduce rates of oxidation and lengthen shelf life of fresh or frozen fillets (Gatta et al 2000;Ruff et al 2002;Hamre et al 2004). Tissue a-tocopherol content and oxidative stability have been enhanced via dietary supplementation with SYNE in sunshine bass (Kocabas and Gatlin 1999), rainbow trout Oncorhynchus mykiss (Chaiyapechara et al 2003), European seabass Dicentrarchus labrax (Gatta et al 2000), Atlantic salmon (Hamre et al 1998(Hamre et al , 2004Scaife et al 2000), Atlantic halibut Hippoglossus hippoglossus (Ruff et al 2002(Ruff et al , 2004, and turbot Scophthalmus maximus (Ruff et al 2003(Ruff et al , 2004. Although no significant differences were noted after long-term storage, fillet aldehydes numerically decreased with increasing dietary NSVE but not with ethoxyquin.…”

Dietary α-tocopheryl acetate on fillet quality of tilapia

“…Improved product quality has been achieved by feeding on supra-nutritional levels of α-tocopheryl acetate before slaughter (RUFF et al, 2002b). This has been demonstrated by Ruff et al (2003), who suggested supplementation of feeds with at least 550 mg α-tocopheryl acetate kg -1 diet for market size turbot two months prior to slaughter improved fillet quality.…”

“…This has been demonstrated by Ruff et al (2003), who suggested supplementation of feeds with at least 550 mg α-tocopheryl acetate kg -1 diet for market size turbot two months prior to slaughter improved fillet quality. Others studies on the Atlantic salmon Salmo salar (ONIBI et al, 1996;, sea bass Dicentrarchus labrax and hybrid tilapia Oreochromis niloticus x O. aureus HZU, 2002) also demonstrated that when dietary vitamin E level increased, lipid peroxidation in post-mortem muscle was inhibited.…”