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Abstract

Proximate, mineral and amino acids composition of Atlantic Mackerel in the Tunisian eastern coastal waters were analyzed in the muscles according to standards (ISO 6496-1999; ISO 5984-2002; ISO 5983-1997; AOCS, Ba 3-38) method. Results revealed that moisture, lipids, protein and ash contents of the analyzed samples vary with season, with higher values obtained in spring for lipid content (16.03%); in summer for ash and moisture (2.54% and 72.12%) and in winter for protein (26.99%). The essential amino acids (EAA) detected are phenylalanine, valine, threonine, isoleucine, methionine, histidine, arginine, leucine and lysine which total level are about (33.79 g/100 g protein). Among the nutrient elements investigated the most abundant is Phosphorus (P) with a high value (576, 69 mg/100 g) in autumn; potassium (K) (324.68 mg/100 g) followed by those of sodium (Na) and magnesium (Mg) (95.30 mg/100 g, 70.59 mg/100 g) in summer and calcium (Ca) (39.85 mg/100 g) in spring. The other identified elements as Fe, Zn and Mn are present in very small quantities. However, the seasonal variation of these mineral contents were observed, and essentially influenced by food availability, fish physiological state and environmental parameters.

Variation in the Proximate Composition, Amino Acids Content and Fatty Acids of Thai Pangus (Pangasianodonhypophthalmus) Fish Depending on Size

“…Fish and fish products are unique sources of high class animal protein because of containing high amount of myofibrillar protein and less stroma protein content. Moreover, fish proteins are characterized by the presence of all essential amino acids in desirable quantity for human body [5] [3]. Amino acids such as methionine and lysine are available in high quantity in fish protein while the tryptophan content is low compared to mammalian protein [6].…”