Recirculating aquaculture systems (RAS)

Gabriel Thomas Kimeu, 27, is a computer science graduate who set up a RAS tilapia, catfish and ornamental fish farm in eastern Kenya and has major ambitions to grow.

Eva Keferböck, CEO of White Panther, an Austrian clearwater shrimp producer, explains why they abandoned biofloc, how their farm is hugely self-sufficient and when she expects to turn a profit.

Black soldier fly producers are being invited to trial – for free – an innovative filtration system that uses microalgae, sometimes paired with oysters, to remove phosphorous and nitrates from their waste water.

Biofilters are commonly used in recirculation aquaculture systems (RAS), but their limitations mean that innovators are busy developing possible alternatives – such as electro-oxidation – or enhancements, such as electro-coagulation and UASB reactors.

Dr Andrew Whiston, a marine biologist and aquaculture innovator, is attempting to revolutionise RAS technology with a system based on one founding principle - maximum efficiency and minimal waste.

Aquaponics facilities are generally more profitable than the recirculation aquaculture systems (RASs) that have sprung up in the US in the past decades.

Dupe Killa-Kafidipe, founder of Platinum Fisheries, has ambitious plans to build a modular RAS facility to help her to diversify and increase production of a range of species - from catfish to shrimp.

David Gebhard, co-founder of the up-and-coming shrimp producer AquaPurna, talks about the development of the company's new commercial site which will employ innovative RAS technology to provide European markets with locally-grown shrimp.

Azerbaijan Fish Farm aims to produce over 9 tonnes of caviar a year and, in the process, help make their country synonymous with sustainable, progressive aquaculture.

In the face of rising mortality rates caused by warming sea temperatures, Saumon de France - Europe's most southernly net pen salmon producer - has had to significantly modify its production cycle, and is looking to expand both offshore and onshore.

Given the decline of wild stocks and surging consumer demand, the case for farming sablefish has never been stronger. However, challenges – in particular relating to growth rates – have meant that few producers of this prized species have achieved commercial s…