Management of zooplanktonic predations for efficient and sustainable production of Arthrospira

Arthrospira, commonly known as Spirulina in the commercial sector, is the most produced algae globally. A significant challenge in Arthrospira mass cultivation is zooplankton contamination, which might result in an annual loss of up to 30 % in biomass productivity if the zooplanktonic predation is not managed. This study, based on comprehensive field tests conducted in 1000 m² raceway ponds, demonstrates the feasibility of using sodium dodecyl benzene sulfonate (SDBS) as a pesticide for managing zooplanktonic predators in Arthrospira mass cultivation. Under compensatory SDBS application, planktonic predators such as rotifers and ciliates are completely eliminated. This involves an initial application of SDBS at 15 mg L⁻¹ followed by an additional enhancement of 5 mg L⁻¹ after 24 h. Early detection of the contamination and apply the SDBS pesticide as soon as possible by a compensatory manner is beneficial for a better management of the contaminations. The findings provide a novel approach for managing zooplanktonic predations and ensuring efficient and sustainable production of Arthrospira.