Abstract:

In order to compare the differences in muscle nutrient composition between farmed and wild Leiocassis
longirostris, the main nutrient components in the muscles of farmed (fed formulated feed) and wild (captured in Beibei
section of Jialingjiang River in Chongqing) Leiocassis longirostris were analyzed in this paper. The general nutrient
components were determined with routine methods, the amino acid compositions were measured with an amino acid
analyzer, and the fatty acid compositions were analyzed with gas chromatography-mass spectrometry. The results
showed that the moisture content in muscle of farmed Leiocassis longirostris was significantly higher than that of wild
Leiocassis longirostris (P < 0.01), while the contents of crude protein and crude fat were significantly lower than those of
wild Leiocassis longirostris (P < 0.01), and no significant difference was found in ash content between farmed and wild
Leiocassis longirostri (P > 0.05). There were 18 kinds of amino acids found in the muscles of farmed and wild Leiocassis
longirostris, and the content of total amino acids (TAA) in farmed Leiocassis longirostris was significant higher than in wild
Leiocassis longirostris (P < 0.05). No significant difference in the content of total essential amino acids (EAA) was found
between farmed and wild Leiocassis longirostris (P > 0.05). It was clear that the contents of different amino acids in muscles
of farmed and wild Leiocassis longirostris were stable, and the constitutional rate of essential amino acids met the FAO/
WHO standards. According to nutrition evaluation in amino acid score (AAS) and chemical score (CS), the first limiting
amino acid for the muscles of both farmed and wild Leiocassis longirostris was tryptophan. The content of delicious amino
acids (DAA) of farmed Leiocassis longirostris was significantly higher than that of wild Leiocassis longirostris (P < 0.01).
Meanwhile, 25 and 27 kinds of fatty acids were detected in farmed and wild Leiocassis longirostris, respectively, and no
significant difference was found in the content of saturated fatty acids (SFA) between farmed and wild Leiocassis longirostri
(P > 0.05). The content of monounsaturated fatty acids (MUFA) was significantly lower than that of wild Leiocassis
longirostri (P < 0.01), and the total content of n-6 polyunsaturated fatty acids (PUFA) was significantly higher than that of
wild Leiocassis longirostri (P < 0.01). However, no significant difference was found in the content of n-3 polyunsaturated
fatty acids (PUFA) between the muscles of farmed and wild Leiocassis longirostri (P > 0.05), and the total content of
polyunsaturated fatty acids (PUFA) was significantly higher than that of wild Leiocassis longirostri (P < 0.01). No significant
difference in index of atherogenicity (IA) or index of thrombogenicity (IT) was observed between farmed and wild
Leiocassis longirostri (P > 0.05). In conclusion, the nutritional quality of farmed Leiocassis longirostri was not decreased
in comparison with that of wild Leiocassis longirostris. Therefore, the nutritional quality of farmed Leiocassis longirostris
could be improved by adjusting the feed formula.

Key words: Leiocassis longirostris, farmed, wild, muscle, nutrient composition