Abstract:

The yield and nutrition components of of Discogobio yunnanensis muscle were analyzed by routine methods.
The results showed that the ratio of flesh to body mass was (66.62 ± 4.46)% andthe contents (mass fraction) of moisture,
crude protein, crude fat and crude ash in the fresh muscle were (76.10 ± 0.91)%, (20.24 ± 0.05)%, (1.32 ± 0.17)% and
(1.30 ± 0.02)%, respectively. A total of 18 amino acids were detected in muscle proteins, including 8 essential amino acids
(EAA), 2 half-essential amino acids (HEAA) and 8 nonessential amino acids (NEAA). In the dried sample, the content
of total amino acids (TAA) was (79.78 ± 4.22)%，and the contents of EAA, HEAA and NEAA were (33.05 ± 1.62)%,
(7.10 ± 0.31)% and (39.63 ± 2.29)%, respectively. Four kinds of delicious amino acids (DAA) accounted for 30.47% of
the total amino acids. The essential amino acid index (EAAI) was 68.09. The percentage of EAA in TAA (EAA/TAA) was
41.43%, and the percentage of EAA in total NEAA (EAA/NEAA) was 83.42%. The EAA composition met the Food and
Agriculture Organization/World Health Organization standard. According to the nutritional evaluation on acid score (AAS)
and chemical score (CS), the first limited amino acid was tryptophan (Trp). The muscle of Discogobio yunnanensis contained
3 saturated fatty acids (SFAs), 4 mono-unsaturated fatty acids (MUFAs) and 7 polyunsaturated fatty acids (PUFAs). The
contents of SFA, MUFA and PUFA were (31.79 ± 0.36)%, (27.93 ± 2.67)% and (40.28 ± 2.54)%, respectively. Furthermore,
the total content of EPA and DHA was (29.23 ± 2.77)%, which was much higher than that of some marine fishes. The
muscle of Discogobio yunnanensis contained abundant mineral elements, especially zinc. These results indicated that
Discogobio yunnanensis is a nutritive and delicious food fish that is promising for artificial rearing.

Key words: Discogobio yunnanensis, ratio of flesh to body, muscle, nutrient composition, nutritional evaluation