Phosphorus Absorption and Excretion in Hybrid Sturgeon (Huso dauricus♀ X Acipenser schrenckii♂) Intubated with Different Ca/P Ratios

To study the effect of Ca/P ratio on P and Ca absorption excretion in hybrid sturgeon (Huso dauricus♀ X Acipenser schrenckii♂), five groups fish were intubated with 100 mg P·kg−1 BW ratios 0:1, 0.25:1, 0.5:1, 1:1, 2:1. Plasma concentrations significantly elevated at below 2:1, highest value was obtained 0.5:1. content increased ratio. Urine rate 0.5:1 higher than that 0:1 The urea rates observed 1:1. total 48 h post intubation reached about 30 mg·kg−1 BW, which recorded for group present showed efficiency improved indicating inclusion level feed can be further optimized to reduce dietary input lower excessive undigested discharge into rearing water.