Abstract: The quality characteristics of aquatic products of geographical indication in Guangxi autonomous region, such as Guiping sand turtle, Guandong grass carp, Quanzhou Chinese ink carp and Qinzhou Crassostrea rivularis were analyzed by determining the contents of protein, fat, Ca, Fe and Zn. The results demonstrated that among the four species of aquatic products, Guiping sand turtle contained the highest protein content of 20.8 g/100 g compared with the lowest of 9.2 g/100 g in Qinzhou Crassostrea rivularis. However, fat content was the lowest (0.3 g/100 g) in Guiping sand turtle but showed a similarity in other three species. The highest contents of Ca, Fe and Zn were all found in Qinzhou Crassostrea rivularis, particularly the content of Zn being 1055.6 mg/kg. Ca content revealed an increase in Quanzhou Chinese ink carp when compared with Guiping sand turtle and Guandong grass carp. Both Fe and Ca showed the lowest contents in Guandong grass carp, which were 5.0 mg/kg and 4.1 mg/kg, respectively. Similar contents of Fe and Zn were observed in Guiping sand turtle and Quanzhou Chinese ink carp. From the above data, it could be concluded that Guiping sand turtle is an aquatic product of higher protein content and lower fat content as compared with other three species. In addition, Guandong grass carp was more abundant in protein than ordinary grass carp and carp. The contents of Ca, Fe and Zn in Quanzhou Chinese ink carp were substantially higher than those in ordinary grass carp and carp. Qinzhou Crassostrea rivularis was rich in Ca, Fe and Zn, especially Fe and Zn with the highest content. Therefore, the contents of protein, fat, Ca, Fe and Zn of the above four species of aquatic products are basically superior to those of other similar products. Further, the 4 indicators can provide significant guidance for the identification of aquatic products of geographical indication in Guangxi.

Key words: aquatic products of geographical indication, nutrients, minerals