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Optimal design of semi-rigid fish farming structures - Laboratory and field testing


Department of Mathematics and Statistics

Assoc Prof Sarah Wakes Thursday, March 11, 2021 Funded PhD Project (Students Worldwide)

About the Project

The New Zealand government has an ambition of reaching $1 billion of sales from aquaculture by 2025, meaning that the $500 million revenue earned in 2018 must be doubled over a relatively short space of time in a country that has limited inshore licenses for aquaculture. To facilitate the government’s goal for major expansion, finfish aquaculture in New Zealand must extend into the open-ocean where production is both limitless and sustainable long term. Growing fish offshore in high energy sites has been attempted in other countries such as Norway but off-shore structures are usually always heavily engineered and fixed to set locations that grow fish under sub-optimal conditions for extended periods of the year. New innovative developments in New Zealand are proposing to maintain fish in novel enclosures that have the capacity to move and maintain fish under optimal conditions year round. A key part of the development is the design of the enclosures, which provides optimal growing conditions for the fish, within engineering constraints. 

This requires both CFD and laboratory modelling to tailor net speed and net ventilation of oxygen and wastes to the needs of a range of fish species, in order to  maximise their growth and health.

We are looking for a PhD student to work on the following project, which are part of a large multidisciplinary well-resourced program, which spans fluid mechanics, fish physiology, marine engineering and design:  

Optimal design of semi-rigid fish farming structures

Candidates should have a Masters degree or equivalent in maths, physics or engineering, with excellent grades, plus some research experience in fluid mechanics. The project aims to use fluid modelling and testing to understand flows, ventilation and loads on semi-rigid towed net structures. The modelling will investigate a number of types of overall net design, with a range of proportions. It also includes modelling the effects of flow control through modelling the size and shape of the net where fluid exits the net.  The project will focus on laboratory and field test modelling of the net designs. Applicants should have backgrounds and experience in fluids laboratory modelling. 

The information derived from this PhD is ultimately intended to inform the design process of the mobile fish enclosure systems and thus requires a high level of self-motivation, pragmatism, good communication skills and a willingness to work within a dedicated team environment.

A three year scholarship is available. This includes an annual stipend and annual tuition fees. Students will register at the University of Otago and split their time between Dunedin and Nelson (Plant and Food Research and Cawthron Institute), being mainly based in Nelson, New Zealand.

For more information feel free to contact Assoc. Prof. Sarah Wakes <>

To apply please send a cover letter, CV and academic transcript to Sarah Wakes. Please include the names and contact details of 2 academic referees. Interviews for the PhD positions will probably take place in March 2021 for an expected start no later than July 2021. Ideally both students would start with 3 months of each other.

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