Control of off-flavor compounds in a full-scale recirculating aquaculture system rearing rainbow trout <i>Oncorhynchus mykiss</i>

Fish is increasingly produced in recirculating aquaculture systems (RAS), which can offer some production and environmental benefits. Unfortunately, there is a tendency to develop off-flavors in RAS, mainly caused by geosmin (GSM) and 2-methyl isoborneol (MIB) accumulating in the fish flesh from the circulating water. These off-flavors are objectionable to consumers, reducing the profitability of production and causing an unwanted reputation for this fish production sector. In this study, combinations of oxidative chemicals: ozone (O₃), hydrogen peroxide (H₂O₂), and peracetic acid (PAA) were applied in a commercial, full-scale (1.3 M kg a⁻¹) RAS rearing rainbow trout (<i>Oncorhynchus mykiss</i>). Inlet water from a nearby lake, circulating water, and depuration water were treated to increase their quality and enhance the depuration procedure. The results showed a decrease of 77% (MIB) and 93% (GSM) in the concentrations of off-flavors in circulating water after the treatments with oxidative chemicals.

循环水养殖系统（Recirculating Aquaculture Systems, RAS）已越来越多地应用于鱼类规模化生产，该系统可在生产效率与环境保护层面带来多重益处。但遗憾的是，RAS养殖过程中易产生异味问题，这类异味主要由循环水中的土臭素（Geosmin, GSM）与2-甲基异茨醇（2-methyl isoborneol, MIB）在鱼肉中富集所导致。此类异味会令消费者难以接受，不仅降低养殖生产的盈利能力，还会给该鱼类养殖行业带来不良声誉。本研究针对年产量1.3×10⁶ kg·a⁻¹的商业化全规模虹鳟（Oncorhynchus mykiss）养殖RAS，采用臭氧（O₃）、过氧化氢（H₂O₂）与过氧乙酸（PAA）三类氧化药剂的组合处理方案。对取自附近湖泊的进水、循环水以及净化水进行处理，以提升水质并优化净化流程。试验结果表明，经氧化药剂处理后，循环水中的异味物质浓度分别下降了77%（针对MIB）与93%（针对GSM）。

搜集汇总

背景与挑战

背景概述

该数据集聚焦于循环水养殖系统中虹鳟鱼异味化合物的控制研究，通过应用臭氧、过氧化氢和过氧乙酸等氧化化学物质，在商业规模系统中显著降低了异味化合物浓度（MIB减少77%，GSM减少93%）。数据集包含补充图表文件，发布于2020年，涉及生物化学和环境科学等多个类别，旨在提高水质和养殖效益。