Abstract：Taimen Hucho taimen with body weight of (435.63±21.32) g was reared in a 6 m×2.5 m×1.2 m running water cement pond and fed diets containing synthetic astaxanthin at a dose of 100 mg/kg (control group) and natural astaxanthin derived from green alga Haematococcus pluvialis at a dose of 10, 20, 40, and 60 mg/kg at water temperature of 12 ℃ to 18 ℃, and astaxanthin content in muscle and the total antioxidant capacity and alkaline phosphatase activity in gills, liver, foregut, hindgut, pylorus, muscle, serum, and blood cells were detected in taimen once every two weeks in order to evaluate the effects of synthetic and natural astaxanthins on the muscle astaxanthin addition and the total antioxidant capacity (T-AOC) in taimen. The results showed that there was significantly higher muscular astaxanthin content in the taimen in 20 mg/kg group and 40 mg/kg group than that in the control group (P<0.05), significantly higher in 40 mg/kg group than that in 20 mg/kg group (P<0.05). The T-AOC of liver, foregut, hindgut, pyloric, serum and plasma were shown to be significantly higher in the four test groups than that in the control group (P<0.05). The alkaline phosphatase activities in gill, hindgut, pyloric, muscle, serum and plasma were significantly higher in the test groups than that in the control group (P<0.05), significantly higher alkaline phosphatase activity foregut, pyloric, muscle, serum and plasma in the 40 mg/kg group than those in other experimental groups (P<0.05). The findings indicate that, compared with the feed supplemented with 100 mg/kg synthetic astaxanthin, the diet supplemented with natural astaxanthin from 20 mg/kg to 40 mg/kg significantly improved the muscular astaxanthin content, and increase significantly the T-AOC of gill, liver, foregut, hindgut, pyloric, serum, plasma, and increase significantly the alkaline phosphatase activities of gill, hindgut, pyloric, muscle, serum, plasma. It is recommended that amount of natural astaxanthin from H. pluvialis be 40 mg/kg in diet of taimen.
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2021, Vol. 40 
