Effects of dietary selenium sources on respiratory metabolism of sea cucumber Apostichopus japonicus
ZHOU Wei1，2，3，PENG An-de1，LU Xiao-qian1
1.College of Fisheries and Life Science，Dalian Ocean University，Dalian 116023，China；2.Dalian Fisheries Association of Industrial Technology Innovation，Dalian 116023，China；3.Science and Technology Park of Dalian Ocean University Co.Ltd.，Dalian 116023，China
Abstract: Juvenile and adult sea cucumber Apostichopus japonicus were fed the diets supplemented with seleniumethionine，sodium selenate and sodium selenite at a rate of 0.6 mg/kg for 60 days to study the effect of different selenium sources on sea cucumber specific growth rate and respiratory metabolism index.The results showed that all the sea cucumber fed the diets supplemented with selenium had significantly higher specific growth rate than the animals in the control group did，the maximal specific growth rate in the selenomethionine group，significantly higher than in the sodium selenate group and sodium selenite group（P＜0.05）.There was higher specific growth rate in the adults than that in the juveniles except for the selenomethionine group.All the sea cucumber fed the diets supplemented with selenium had significantly higher oxygen consumption rate than the animals in the control（P＜0.05）did，the minimal oxygen consumption rate in selenomethionine group，significantlty lower than sodium selenate and sodium selenite groups（P＜0.05），and the juvenilese higher than the adults.There was lower ammonia excretion rate in the sea cucumber fed the diets supplemented with selenium than in the control，the minimal in selenomethionine group，and significantly lower than in the control（P＜0.05），without significant difference among sodium selenate group，sodium selenite group and the control（P＞0.05）.The juveniles had higher ammonia excretion rate than the adults did.There was significantly higher O/N value in the sea cucumber fed the diets supplemented with selenium than in the test group（P＜0.05），the minimal O/N in selenomethionine group，without significant difference among all the treated groups（P＞0.05），and he juveniles higher than the adults.The findings suggested that addition of selenium improved metabolic rate and growth，with the organic selenium（selenomethionine）being better than the inorganic selenium（sodium selenate，and sodium selenite）and juveniles being better than the adults in the selenomethionine group.
2016, Vol. 31 
