Comparison of the Quality of Pelteobagrus fulvidraco Cultured Conventionally and by the Wetland-recirculating Water Pond Combination
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Abstract:
In order to compare the difference in the quality of Pelteobagrus fulvidraco cultured conventionally and by the wetland-recirculating water pond combination, the water quality of the aquaculture ponds was evaluatedin this study. Meanwhile, techniques such as ultra-performance liquid chromatography (UPLC) and gas chromatography-mass spectrometry (GC-MS) were used to analyze the appearance and textural quality, nutritional quality and flavor quality of P. fulvidraco cultured in the wetland-recirculating water pond combined system and in conventional pond. The results indicated that the water in the wetland-recirculating water pond combined system was less polluted, the degree of eutrophication of the water body was suppressed, the empty shell rate, brightness and whiteness of the muscle of the P. fulvidraco cultured in combined system were much higher, and the muscle's cooking loss rate was significantly reduced, compared with those of the conventional group. The essential amino acid/ total amino acid ratio and essential amino acid/ non-essential amino acid ratio of the wetland group were 40.40% and 78.67%, correspondingly, and the amino acid composition of the muscle was more in line with the ideal protein pattern recommended by FAO/WTO. The contents of unsaturated fatty acids, Omega-3 fatty acids and Omega-6 fatty acids of the wetland group were 3.78, 2.64 and 3.25 times that of the traditional group, respectively. In the wetland group, the content of volatile odor substances with unpleasant odor slike oily odor also decreased, the total proportion of bitter and sour amino acids decreased, whilst the total proportion of umami and sweet amino acids increased, and the content of IMP with umami taste was 3.16 times that of the traditional group. Compared with the conventional group, the amounts of bitter HxR and Hx decreased by 17.00% and 17.57%, respectively. In summary, the P. fulvidraco cultivated in the wetland-recirculating water pond had a higher proportion of edible parts, whiter and brighter meat, a better nutritional composition of muscle, and a superior flavor quality. This study canprovide theoretical supportfor the improvement of the quality of P. fulvidraco and the promotion of the wetland-recirculating water pond combined culture mode.
