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In fish, vitamins are part of the first line of the antioxidant defense, and they are directly related to stress and disease, and they are involved in the maintenance of various physiological processes and metabolic reactions. In general, fish are unable to synthesize vitamin C due to a deficiency in gulonolactone oxidase (GLO), enzyme which is responsible for its de novo synthesis. Vitamin E is involved in the immune response and perhaps one of its main physiological functions is to protect membranes from oxidative damage (lipid peroxidation) associated to increased free radical production. In fish muscle, vitamin E has an important role as an antioxidant in vivo and its content is highly related to the stability of lipids and fats. Both vitamin C and vitamin E can act as antioxidants in a synergistic manner. The aim of this study was to determine the content of vitamins C and E in muscle from different species of elasmobranch and teleost fish. Fish species included in this study were selected based on their ecological and economic relevance. The concentrations of vitamin C and E were determined by high performance liquid chromatography (HPLC). The concentration of vitamin C found for elasmobranch group was lower (p = 0.000) than the group of teleosts. For Mustelus henlei vitamin C only was found in one individual; Tetrapturus audax and Totoaba macdonaldi had values ??below to detection limit. The concentration of vitamin E was lower in the group of elasmobranchs (p = 0.03) compared with teleosts. The concentration of vitamins is related to the nutritional requirements of fish (decreasing with age) and these are influenced by different factors. Vitamin C in muscle usually has low concentrations at levels that can be considered as negligible. Levels of vitamin E are related to the level of polyunsaturated fatty acids (PUFA) in the fish, probably as a protection mechanism against peroxidation of these molecules highly susceptible to oxidative damage.

Palabras clave: Elasmobranchs; Vitamins; Antioxidants; teleosts

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