Summary In this study, recombinant dough and simulated dough medium were used to study the effect of different glucose levels on quality of dough. With the increase of glucose levels (3, 6, 9, 12 and 15 g/100 g mixed flour) in recombinant dough, the water absorption and extensibility of the dough decreased significantly. Compared with the sugar‐free medium, the maximum height of the dough added with glucose gradually increased, and the CO2 retention rate decreased slightly. The glucose levels in the dough changed the water mobility and distribution. Compared with 3% glucose levels, yeast produced much more glycerol content and ethanol content in 6% and 15% glucose medium, which affected rheological properties of dough. Different glucose levels affected the fermentation state of yeast and metabolites significantly, 3% glucose medium was more suitable for the dough fermentation and growth of yeast during dough fermentation.

A 57-day growth experiment was conducted with juvenile gibel carp (13.48 AE 0.10 g) in a flow-through system to study the effect of dietary phosphorus on growth performance, body composition, nutrition utilization, phosphorus loading and enzymes activities. Seven semipurifed diets were formulated to contain 0.07 (the basal), 2. 27, 5.32, 8.10, 12.06, 15.24 and 19.48 g available phosphorus/kg diet.The results showed that specific growth rate, body length and feed efficiency significantly increased in the fish fed diets containing 0.07 to 15.24 g available P/kg diet (p < .05). Ash and P content increased in fish fed diets containing 0.07-12.06 P g/kg (p < .05) and then levelled off, while moisture, crude protein and lipid had no significant difference (p > .05). The protein retention efficiency increased in the fish fed with diets 0.07-5.32 g/kg P (p < .05) and then reached a plateau. The P content in faeces was higher in fish fed diets containing 15.24 and 19.48 g available P/kg. Total P concentration in tank water increased in fish fed 0.07-12.06 g available P per kg diet (p < .05). The plasma P was higher in the fish fed with 15.24 g available P/kg diet (p < .05), triglycerides was lower in the fish fed diet containing 15.24 and 19.48 g available P/kg (p < .05), no significant differences were observed in plasma Ca, plasma glucose and calcitonin (p > .05). Based on SGR, whole body P content and FE, dietary available P requirement for juvenile gibel carp were 13.37, 13.97 g/kg and 15.06 respectively. K E Y W O R D S growth performance, juvenile gibel carp, nutrition utilization, P loading, phosphorus wileyonlinelibrary.com/journal/are Aquaculture Research. 2018;49:1284-1292.