Appropriate zinc requirements of Litopenaeus vannamei under low-salinity cultivation estimated by biokinetic modeling

IF 3.9 1区农林科学 Q1 FISHERIES

Aquaculture Pub Date : 2025-09-15 DOI:10.1016/j.aquaculture.2025.743193

Qi Yang , Minjie Hu , Lijun Ning , Jian Wang , Xun Wang

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引用次数: 0

Abstract

The Pacific white shrimp (Litopenaeus vannamei) has become a popular species in low-salinity aquaculture in China, while its production efficiency remains limited compared to marine systems. Zinc (Zn), an essential mineral element, plays a critical role in shrimp growth. In the present study, we employed the stable isotope ⁶⁸Zn as a tracer to quantify Zn accumulation dynamics in L. vannamei reared at 5 ppt salinity. An optimized biokinetic model was developed to determine the precise Zn requirements in low-salinity conditions. The results demonstrate that dietary uptake made more contribution to Zn assimilation (>50 %) than waterborne uptake under environmentally relevant dissolved Zn concentrations (5–20 μg L⁻¹). The biokinetic model estimated a daily net Zn flux of 1.16–1.27 μg g⁻¹ d⁻¹, corresponding to an appropriate dietary Zn concentration of 44–66 mg kg⁻¹ at ingestion rates of 2–3 %. These predictions were validated by a 30-day feeding trial, where shrimp fed diets supplemented with 40–80 mg kg⁻¹ Zn exhibited significantly improved growth performance and physiological responses (e.g., digestive and antioxidant enzyme activities). Overall, this study provides a mechanistic framework for optimizing Zn supplementation in shrimp feeds. The biokinetic approach offers an alternative to traditional methods, with broader applications for precise mineral nutrition.

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利用生物动力学模型估算低盐度栽培条件下凡纳滨对虾适宜的锌需用量

凡纳滨对虾（Litopenaeus vannamei）已成为中国低盐度养殖的热门品种，但与海洋系统相比，其生产效率仍然有限。锌（Zn）是虾类必需的矿质元素，在虾类生长中起着至关重要的作用。在本研究中，我们采用稳定同位素68Zn作为示踪剂，量化了盐度为5 ppt的南美扁豆锌积累动态。建立了一个优化的生物动力学模型，以精确确定低盐度条件下锌的需要量。结果表明，在与环境相关的溶解锌浓度（5 ~ 20 μg L−1）下，日粮吸收对锌同化的贡献大于水吸收（50%）。生物动力学模型估计，日净锌通量为1.16-1.27 μg−1 d−1，对应于饲粮中锌的适宜浓度为44-66 mg kg−1，摄食率为2 - 3%。在为期30天的饲养试验中，这些预测得到了验证，在饲料中添加40-80 mg kg - 1 Zn的对虾表现出显著改善的生长性能和生理反应（如消化酶和抗氧化酶活性）。综上所述，本研究为优化虾饲料中锌的添加提供了一个机制框架。生物动力学方法为传统方法提供了一种替代方法，在精确矿物质营养方面具有更广泛的应用。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Aquaculture 农林科学-海洋与淡水生物学

CiteScore

8.60

自引率

17.80%

发文量

1246

审稿时长

56 days

期刊介绍： Aquaculture is an international journal for the exploration, improvement and management of all freshwater and marine food resources. It publishes novel and innovative research of world-wide interest on farming of aquatic organisms, which includes finfish, mollusks, crustaceans and aquatic plants for human consumption. Research on ornamentals is not a focus of the Journal. Aquaculture only publishes papers with a clear relevance to improving aquaculture practices or a potential application.