Proximate, Minerals and Amino Acids Compositionof Acanthurus monronviae and Lutjanus goreensisFish Muscle

Abstract

The muscle of two lagoon fishes known as Acanthurus monroviae and Lutjanus goreensis was analysed for proximate, minerals and amino acids compositions. The proximate values were high in crude protein (65.4-68.5
g/100 g) and energy (1433-1436 kJ/100 g) but low in most other proximate parameters with calculated fatty acid ranging between 3.61and 4.38 g/100 g. The proportion of total energy due to protein was highest with a range of 77.4-81.2 % and the utilizable energy due to protein was between 46.4 and 48.7 %. The two most concentrated minerals were K (392-419 mg/100 g) and P(219-269 mg/100 g) whereas each of the trace minerals was < 1.0 mg/100 g. For other mineral quality parameters, [K/(Ca+Mg)] was high at value range of 16.4-18.3. The two most abundant essential amino acids were Lys (8.88-9.57 g/100 g) and Leu (8.58-9.31 g/100 g) whereas the two most concentrated non-essential amino acids were Glu (13.4-14.7 g/100 g) and Asp (8.85-10.4 g/100 g). Total essential amino acid (with His) ranged from 47.4-48.5 g/100 g with corresponding percentage of 51.5-50.0. On other amino acid quality parameters: P-PER1, range was 3.09-3.41; EAAI was 1.39-1.44 and BV was 81.6-85.0. For amino acid scores, Ser was limiting in both samples in comparison with whole hen’s egg; under provisional EAA scoring pattern, Val was limiting in the two samples; under EAA of preschool child requirement, no amino acid was limiting since each score
was > 1.0. In all the parameters determined (proximate, energy, minerals, amino acids, pI, scores), significant differences occurred between the two fish samples since rc > rt at r = 0.01 in each case. In most of the determi-nations made, the corresponding concentrations were more in A. monroviae than in L. goreensis