Effects of biofloc-electrochemical system on water quality, fish performance, and microbial diversity

IF 4.3 2区农林科学 Q2 AGRICULTURAL ENGINEERING

Aquacultural Engineering Pub Date : 2025-05-16 DOI:10.1016/j.aquaeng.2025.102567

Wenfei Su , Jincheng Lin , Wenchang Liu , Yanshuo Guo , Jiahui Wang , Guozhi Luo , Hongxin Tan

{"title":"Effects of biofloc-electrochemical system on water quality, fish performance, and microbial diversity","authors":"Wenfei Su , Jincheng Lin , Wenchang Liu , Yanshuo Guo , Jiahui Wang , Guozhi Luo , Hongxin Tan","doi":"10.1016/j.aquaeng.2025.102567","DOIUrl":null,"url":null,"abstract":"<div><div>This study investigated the effects of the in-situ biofloc-electrochemical system (BES) on nitrogen (N) and phosphorus (P) removal, growth performance, health status of Nile tilapia (Oreochromis niloticus), and microbial composition in both biofloc and the intestinal tract. Tilapia were cultured in a biofloc system with microcurrent direct current electric fields at 0, 100, and 200 mA for 36 days. Results showed that electrolysis significantly enhanced the degradation of ammonia nitrogen (TAN), nitrite nitrogen (NO2--N), phosphate (PO43--P), and total phosphorus (TP) (p < 0.05), but had no significant effect on nitrate nitrogen (NO3--N) removal (p > 0.05). In the 100 mA group, no significant differences were observed in feed conversion ratio (FCR) and specific growth rate (SGR) compared to the control group (p > 0.05). However, in the 200 mA group, FCR was significantly increased, and SGR was significantly decreased (p < 0.05), indicating that higher current levels suppressed tilapia growth performance. Enhanced digestive capacity in the intestinal tract was observed, with minimal oxidative stress effects in the gills and liver. Electrolysis also significantly altered the microbial composition, abundance, and diversity in both biofloc and intestinal microbiota (p < 0.05). Notably, increases in Actinobacteriota and Bacteroidota may improve tilapia immunity and nutrient cycling, influencing both growth and water quality. These findings suggest that while BES effectively improves water quality, further optimization is needed to enhance fish growth performance and nitrogen removal efficiency.</div></div>","PeriodicalId":8120,"journal":{"name":"Aquacultural Engineering","volume":"111 ","pages":"Article 102567"},"PeriodicalIF":4.3000,"publicationDate":"2025-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Aquacultural Engineering","FirstCategoryId":"97","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0144860925000561","RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"AGRICULTURAL ENGINEERING","Score":null,"Total":0}

引用次数: 0

Abstract

This study investigated the effects of the in-situ biofloc-electrochemical system (BES) on nitrogen (N) and phosphorus (P) removal, growth performance, health status of Nile tilapia (Oreochromis niloticus), and microbial composition in both biofloc and the intestinal tract. Tilapia were cultured in a biofloc system with microcurrent direct current electric fields at 0, 100, and 200 mA for 36 days. Results showed that electrolysis significantly enhanced the degradation of ammonia nitrogen (TAN), nitrite nitrogen (NO₂^--N), phosphate (PO₄^3--P), and total phosphorus (TP) (p < 0.05), but had no significant effect on nitrate nitrogen (NO₃^--N) removal (p > 0.05). In the 100 mA group, no significant differences were observed in feed conversion ratio (FCR) and specific growth rate (SGR) compared to the control group (p > 0.05). However, in the 200 mA group, FCR was significantly increased, and SGR was significantly decreased (p < 0.05), indicating that higher current levels suppressed tilapia growth performance. Enhanced digestive capacity in the intestinal tract was observed, with minimal oxidative stress effects in the gills and liver. Electrolysis also significantly altered the microbial composition, abundance, and diversity in both biofloc and intestinal microbiota (p < 0.05). Notably, increases in Actinobacteriota and Bacteroidota may improve tilapia immunity and nutrient cycling, influencing both growth and water quality. These findings suggest that while BES effectively improves water quality, further optimization is needed to enhance fish growth performance and nitrogen removal efficiency.

查看原文本刊更多论文

生物絮凝-电化学系统对水质、鱼类生产性能和微生物多样性的影响

本研究研究了原位生物絮团电化学系统（BES）对尼罗罗非鱼（Oreochromis niloticus）氮、磷去除、生长性能、健康状况以及生物絮团和肠道微生物组成的影响。罗非鱼在0、100和200 mA的微直流电场的生物絮体系统中培养36天。结果表明，电解对氨氮（TAN）、亚硝酸盐氮（NO2——N）、磷酸盐（PO43——P）和总磷（TP）的降解效果显著（P <； 0.05），对硝态氮（NO3——N）的去除效果不显著（P >； 0.05）。100 mA组的饲料系数（FCR）和特定生长率（SGR）与对照组相比无显著差异（p >； 0.05）。而在200 mA组，FCR显著升高，SGR显著降低（p <； 0.05），说明较高的电流水平抑制了罗非鱼的生长性能。观察到肠道的消化能力增强，鳃和肝脏的氧化应激作用最小。电解还显著改变了生物群落和肠道微生物群的微生物组成、丰度和多样性（p <； 0.05）。值得注意的是，放线菌群和拟杆菌群的增加可能会改善罗非鱼的免疫力和营养循环，从而影响生长和水质。综上所述，虽然BES能有效改善水质，但仍需进一步优化以提高鱼类的生长性能和脱氮效率。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Aquacultural Engineering 农林科学-农业工程

CiteScore

8.60

自引率

10.00%

发文量

审稿时长

>24 weeks

期刊介绍： Aquacultural Engineering is concerned with the design and development of effective aquacultural systems for marine and freshwater facilities. The journal aims to apply the knowledge gained from basic research which potentially can be translated into commercial operations. Problems of scale-up and application of research data involve many parameters, both physical and biological, making it difficult to anticipate the interaction between the unit processes and the cultured animals. Aquacultural Engineering aims to develop this bioengineering interface for aquaculture and welcomes contributions in the following areas: – Engineering and design of aquaculture facilities – Engineering-based research studies – Construction experience and techniques – In-service experience, commissioning, operation – Materials selection and their uses – Quantification of biological data and constraints