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

To study the effect of Ca/P ratio on the P and Ca absorption and excretion in hybrid sturgeon (<i>Huso dauricus</i><i>♀</i> X <i>Acipenser schrenckii</i><i>♂</i>), five groups of fish were intubated with 100 mg P·kg<sup>−1</sup> BW with the...

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Bibliographic Details
Main Authors: Jiali Jin, Zhipeng Chu, Rui Ruan, Wei Liu, Xihua Chen, Chuangju Li
Format: Article
Language:English
Published: MDPI AG 2022-06-01
Series:Fishes
Subjects:
Online Access:https://www.mdpi.com/2410-3888/7/3/138
Description
Summary:To study the effect of Ca/P ratio on the P and Ca absorption and excretion in hybrid sturgeon (<i>Huso dauricus</i><i>♀</i> X <i>Acipenser schrenckii</i><i>♂</i>), five groups of fish were intubated with 100 mg P·kg<sup>−1</sup> BW with the Ca/P ratios of 0:1, 0.25:1, 0.5:1, 1:1, and 2:1. Plasma P concentrations were significantly elevated at Ca/P ratios below 2:1, and the highest value was obtained at Ca/P ratio of 0.5:1. Plasma Ca content was significantly increased at the highest Ca/P ratio. Urine P excretion rate in the fish intubated with Ca/P ratio of 0.5:1 was significantly higher than that of the groups with Ca/P ratios of 0:1 and 2:1. The highest urea excretion rates were observed at Ca/P ratio of 0.5:1 and 1:1. The total P excretion at 48 h post intubation reached about 30 mg·kg<sup>−1</sup> BW, which was recorded for the group with Ca/P ratio of 0.5:1. The present study showed that P absorption efficiency was improved in hybrid sturgeon at Ca/P ratio of 0.5:1, indicating that P inclusion level in sturgeon feed can be further optimized to reduce dietary P input and lower the excessive undigested P discharge into the rearing water.
ISSN:2410-3888