Optimising water chemistry for intensive production of rainbow trout in Recirculating Aquaculture Systems (RAS). (Ref: 4292)

优化循环水产养殖系统 (RAS) 中虹鳟鱼集约化生产的水化学。

• 批准号: 2775844
• 金额: --
• 依托单位: UNIVERSITY OF EXETER
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2022
• 资助国家: 英国
• 起止时间: 2022 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2775844
• 关键词: Optimising; water; chemistry; intensive; production

Land-based recirculating aquaculture systems (RAS) offer many advantages for aquaculture including greatly reduced freshwater abstraction, enhanced biosecurity and control over the aquatic environment for growing fish, easier management of effluent water and greatly reduced effluent water volume.However, RAS also creates water chemistry conditions that are quite different from the natural environment, and that require management and technological solutions to avoid adverse health and welfare outcomes for the fish. In particular CO2 is always elevated above atmospheric equilibrium, and RAS managers often increase pH, alkalinity, calcium hardness and salinity beyond levels in natural freshwater environments as part of the RAS water chemistry management strategy. However, no studies have yet established the interactive effects of all these variables on fish, including rainbow trout, or provided evidence-based guidance on what optimal levels might be. There is already concern about some of these variables (e.g., elevated CO2) and problems such as nephrocalcinosis (kidney stones). This will be the first study to explore all the potential contributors to this health problem, including water chemistry and diet, as well as their role in more general aspects of fish growth, health and welfare. This PhD will work closely with our project partners (the British Trout Association and various trout farming companies) to survey water chemistry data and farmer opinion from UK trout farms on what is most relevant to avoiding adverse health outcomes and having the most efficient production. Based on this survey, the proposed PhD project will use physiological approaches and in vivo experimental work with rainbow trout to provide a full exploration of how both water chemistry and diet affect growth, health and welfare (e.g. immune function). This project provides a further inter-disciplinary component, by addressing a further knowledge gap we have identified in the aquaculture industry; the lack of real-time sensors for continuously monitoring many water chemistry variables in RAS (that are cheap, robust and accurate) to aid day-to-day management of water chemistry and its optimisation for fish growth and health. Expertise in chemistry and environmental sensors at Exeter (Dr. Alexis Perry) within the SWBio consortium (GW4 Water Security Alliance - "Environmental Sensors" working group in particular Dr. Pedro Estrela at Bath University), will help develop innovative solutions to this problem.

陆基循环水养殖系统（RAS）为水产养殖提供了许多优势，包括大大减少淡水抽取，提高生物安全性和对水产养殖环境的控制，更容易管理废水和大大减少废水量。然而，RAS也创造了与自然环境截然不同的水化学条件，这需要管理和技术解决方案，以避免对鱼类的健康和福利产生不利影响。特别是二氧化碳总是高于大气平衡，RAS管理人员经常增加pH值，碱度，钙硬度和盐度超过自然淡水环境的水平，作为RAS水化学管理战略的一部分。然而，目前还没有研究确定所有这些变量对鱼类（包括虹鳟鱼）的相互作用，或者提供关于最佳水平的循证指导。已经有人对其中一些变量表示担忧（例如，升高的CO2）和肾钙质沉着症（肾结石）等问题。这将是第一项探索导致这一健康问题的所有潜在因素的研究，包括水化学和饮食，以及它们在鱼类生长、健康和福利等更一般方面的作用。该博士将与我们的项目合作伙伴（英国鳟鱼协会和各种鳟鱼养殖公司）密切合作，调查英国鳟鱼养殖场的水化学数据和农民意见，了解与避免不良健康后果和最有效生产最相关的内容。根据这项调查，拟议的博士项目将使用生理方法和虹鳟鱼的体内实验工作，以全面探索水化学和饮食如何影响生长，健康和福利（例如免疫功能）。该项目提供了一个进一步的跨学科组成部分，通过解决我们在水产养殖业中发现的进一步知识差距;缺乏实时传感器来持续监测RAS中的许多水化学变量（廉价，强大和准确），以帮助日常管理水化学及其优化鱼类生长和健康。埃克塞特（亚历克西斯佩里博士）在SWBio财团（GW 4水安全联盟-“环境传感器”工作组，特别是巴斯大学的佩德罗埃斯特雷拉博士）的化学和环境传感器方面的专业知识，将有助于开发解决这一问题的创新解决方案。