Fish stocks as phosphorus sources or sinks: Influenced by nutritional and metabolic variations, not solely by dietary content and stoichiometry

We hypothesized that fish biomass could act as a source or sink of P, sometimes related to food N:P stoichiometry and many times not. Elemental proportions may not fully explain homeostasis in consumers. Rather the right proportion of certain organic molecules but not all molecules (containing the very same elements) do. With or without these molecules, homeostasis may show unprecedented plasticity, and DRP losses could either go for primary productivity or remain trapped in consumer. Five experiments investigated the following objectives using semi-purified research diets (SPRD) on the common carp (Cyprinus carpio) model. The objectives were as follows: (a) to investigate differences in P utilization efficiency (PUE) and DRP losses between scaleless and scaly carp fed a P-deficient diet; (b) to investigate graded levels of bioavailable P fed (maintaining iso-nitrogenous and isoenergetic intake) on PUE and DRP losses of scaly carp; (c) to investigate graded levels of digestible lysine and methionine fed (maintaining iso-nitrogenous, iso-phosphorus, and isoenergetic intake) on PUE and DRP losses of scaly carp; (d) to investigate graded levels of digestible non-protein energy (NPE) intake (maintaining iso-nitrogenous, iso-amino acids, and iso-phosphorus intake) on PUE and DRP losses of scaly carp; and (e) to investigate overwintering-like feed deprivation on PUE and DRP losses at basal metabolism.

This dataset contains data of pre-trial, experiment 1 to 4 included in the manuscript.

Parameters include: Experiment; Group; Replicate; Initial tank biomass; Final tank biomass; Feed digestible N; Feed bioavailable P; Food N: P (mass); Food N: P (molar); Non-faecal P loss; Non-faecal N loss; Non-faecal N:P loss (mass); Non-faecal N:P loss (molar); Body protein content; Body N content; Body P content; Body N:P (mass); Body N:P (molar); PUE; DRP losses.

Experimental groups include: For experiment 1 to 3 (control, T1, T2 and T3), For pre-trial (scaly carp and scaleless carp), For experiment-4 (starved).

本研究假设鱼类生物量可能作为磷元素的源或汇，有时与食物中氮磷比化学计量学相关，而多数情况下则不然。元素比例或许无法完全解释消费者体内的稳态，相反，特定有机分子的恰当比例而非所有分子（即使含有相同的元素）才能实现。无论是否含有这些分子，稳态可能展现出前所未有的可塑性，而DRP（粗蛋白质）的损失可能转化为初级生产力，或者被困于消费者体内。通过在鲤鱼（Cyprinus carpio）模型上使用半纯化研究饲料（SPRD），五项实验旨在探究以下目标：（a）探究无鳞和有鳞鲤鱼在磷缺乏饲料喂养条件下磷利用效率（PUE）和DRP损失的差异；（b）探究不同水平生物可利用磷（维持等氮和等能量摄入）对有鳞鲤鱼磷利用效率和DRP损失的影响；（c）探究不同水平可消化赖氨酸和蛋氨酸（维持等氮、等磷和等能量摄入）对有鳞鲤鱼磷利用效率和DRP损失的影响；（d）探究不同水平可消化非蛋白质能量（NPE）摄入（维持等氮、等氨基酸和等磷摄入）对有鳞鲤鱼磷利用效率和DRP损失的影响；（e）探究模拟越冬期的饲料剥夺对基础代谢下磷利用效率和DRP损失的影响。该数据集包含了手稿中预试验及第1至4次实验的数据。参数包括：实验；组别；重复次数；初始水族箱生物量；最终水族箱生物量；饲料可消化氮；饲料生物可利用磷；食物氮磷比（质量比）；食物氮磷比（摩尔比）；非粪磷损失；非粪氮损失；非粪氮磷损失（质量比）；非粪氮磷损失（摩尔比）；体内蛋白质含量；体内氮含量；体内磷含量；体内氮磷比（质量比）；体内氮磷比（摩尔比）；磷利用效率；DRP损失。实验组别包括：实验1至3（对照组、T1组、T2组和T3组），预试验（有鳞鲤鱼和无鳞鲤鱼），实验4（饥饿组）。