Physical address
Warehouse #3, 11 Stott Road, Selby, Johannesburg, 2001

Postal address
P.O. Box 55599, Northlands, Johannesburg, 2116

William Kelly
T: +27 82 886 7114

Hugo Höll
T: +33 60 703 3391

Ross Matthews
T: +27 83 307 3073



William Kelly, one of the founding members of Rydawi Fish Farms, is an active participant in the aquaculture industry.  William identified the Recirculating Aquaculture System (RAS) as the most appropriate large-scale fish production system in South Africa due to climatic constraints and the ability to control the species-specific success factors year round.  However, he found a poor track record of aquaculture projects in the industry.  Investigation found that these failures were a result of one or more of the following:

  • Inappropriate species selection,
  • poor system design,
  • limited management skills and/or experience,
  • poor cash flow planning,
  • insufficient capital at the outset.

William decided to look outside the aquaculture industry to find a solution.  He found it in the minerals and mining industry which has established methodologies to execute complex large-scale, capital-intensive projects.   He realised that creating a combination of skills, knowledge and experience that combined aquaculture, financial and mining & minerals sectors skill sets and experience was needed. Arising from this Rydawi Services was formed to assist the aquaculture industry develop and grow.

Rydawi Services brings an engineering approach to project design and development using our proprietary Project Development Framework, which is unique in the aquaculture industry in South Africa.


William Kelly, BSc Eng (Chem), APMP

William has been involved in the domestic aquaculture industry for more than 25 years.  He established and successfully grew Happy Koi and has involved in the Tilapia aquaculture industry for more than 10 years where he is a pioneer of the moving bed filter technology, developed proprietary aquaculture filtration systems and, together with David Fincham, developed the Aquaculture Production Unit (APU) – a small but scalable aquaculture production system.  APUs are currently being sold across Africa.

Hugo Höll, BSc Eng (Chem), MBA

Hugo was a senior executive in the mining and metallurgical industry in South Africa and has extensive experience in formulation and successful execution of complex engineering projects.  This include engineering & design of sophisticated systems, project management of complex projects, managing EPCM service providers and running large multifaceted organisations.

Ross Matthews, BAcc, CA (SA), MBA

Ross was a senior executive in the investment banking and management consulting industries and has many years of experience in working with entrepreneurs and SMEs to develop and expand their businesses.  This included, financial modelling, operational management, business development and fund raising.