Modeling phosphorus metabolism in fish species: an example for juvenile yellow catfish, Pelteobagrus fulvidraco
Modeling phosphorus metabolism in fish species: an example for juvenile yellow catfish, Pelteobagrus fulvidraco
复制标题
DOI：
10.1007/s10499-015-9925-4
复制
发表时间：
2016-02
影响因子：
2.9
通讯作者：
Chunfang Wang;Q. Tang;W. Luo;Yingming Zhao
中科院分区：
文献类型：
--
作者：
Chunfang Wang;Q. Tang;W. Luo;Yingming Zhao
通过生长试验，研究了饲料中磷(P)对幼鱼磷的利用和排泄的影响。对4种描述鱼类磷代谢机制的数学模型进行了检验，并用Akaike信息准则筛选出最优模型来描述饲料有效率与磷废物(溶解或固体)之间的关系。线性模型表明，固体磷废物随日粮总磷含量的增加而增加。以饲料有效磷百分率预测溶解性磷废物的Logistic模型最好，其渐近值为11 mg/kg饲料。溶解磷废物的排泄率与饲料磷浓度的关系在Pavail%=111.0和5 mg/kg饲料中达到最大。Ricker的穹顶模型估计，溶解磷废物的比例随着饲料磷的增加而增加，在Pavail%=1.24时达到最大值89%，然后在Pavail%=1.24时开始下降。线性回归分析表明，饲料中磷的增加并不影响鱼体的生长和饲料转化率，但会导致幼鱼磷存留率下降，固体磷废物增加。
We conducted a growth trial to study how dietary phosphorus (P) influenced utilization and excretion of P for juvenile yellow catfish. Four mathematical models describing different mechanisms of fish phosphorus metabolism were tested, and the best model was selected using Akaike information criterion to describe the relationships between dietary Pavail%and P wastes (dissolved or solid). A linear model showed that solid P waste increased with the increase in dietary total P. A logistic model with an asymptotic dissolved P waste value at 11 g/kg feed provided the best prediction on dissolved P waste by dietary Pavail%. The maximum discharge rate of dissolved P waste relative to dietary P concentration was found at Pavail%= 1.0 and the dissolved P waste of 5 g/kg feed. A Ricker’s dome-shape model estimated that the proportion of dissolved P waste increased with dietary Pavailto the maximum value of 89 % at Pavail%= 1.24 and then started to decrease at Pavail%> 1.24. P excretion seemed to be mainly in the form of dissolved P when fish fed with the feed containing highly available P. Linear regression analysis showed that an increase in dietary P did not affect growth and feed conversion ratio, but resulted in a decrease in phosphorus retention rate and an increase in solid P waste in juvenile yellow catfish.