Abstract: Approximate composition and amino acid levels were analyzed in muscles of taimenHuchotaimen, lenokBrachymystaxlenokand their hybrid with body weight of 38.03-55.03 g. The results showed that there was significant difference in the crude lipid contents in muscles among the fishes(P<0.05). The hybrid had median moisture and crude ash level and higher crude protein content than the taimen and lenok. There were higher essential amino acid (EAA) and total amino acid (TAA) levels in the hybrid than taimen and lenok, and the median delicious amino acid (DAA) level was found in the hybrid. The three fish species had higher EAA levels than the FAO/WHO standard and the egg standard, and the maximum in the hybrid. There were far higher AAS, CS and EAAI in the hybrid than taimen and lenok, the minimum in lenok. The findings indicated that the muscles of the 3 fishes were delicious and had high nutritional value, especially the hybrid.