Growth, lipogenesis and liver composition of juvenile white sturgeon fed different levels of D-glucose

Abstract

Juvenile white sturgeon ( Acipenser transmontanus) were fed different levels (0, 7, 14, 21, 28, 35%) of dietary D-glucose for 8 weeks. Fish fed diets with greater than 7% D-glucose had significantly ( P < 0.05) greater percent body weight increase, energy retained and body lipid than fish fed the 0% glucose diet. Percent protein deposited and body protein were not affected by the dietary treatments. Increasing dietary D-glucose caused plasma glucose and triacylglycerol levels to be elevated. Liver glucose-6-phosphate dehydrogenase, 6-phosphogluconate dehydrogenase, isocitrate dehydrogenase and malic enzyme activities were also greater in sturgeon fed the higher glucose diets. Fish fed the 28 and 35% glucose diets had two to three times the lipogenic enzyme activities of those fed the 0 and 7% diets. Hepatosomatic index, liver weight and liver glycogen levels showed an increasing trend with increasing dietary D-glucose levels. Fish fed diets with D-glucose had more than twice the liver glycogen levels of fish fed the 0% glucose diet.