WWW.WA S .ORG • WORLD AQUACULTURE • SEP TEMBER 2022 15 In each issue of World Aquaculture, we highlight exciting papers from the Journal of the World Aquaculture Society. In this issue we highlight the following paper “Treatment of effluents frommarine shrimp culture with biofloc technology: Production of Arthrospira (Spirulina) platensis (cyanobacteria) and nutrient removal” by M. Holanda, C. Besold, F.L. Sempere, P.C. Abreu and L. Poersch. The article appears in the Journal of the World Aquaculture Society, volume 53, issue 3, pages 669-680. It is available at: https:// doi.org/10.1111/jwas.12840 or under the Publications tab at the WAS website (www.was.org). Achieving a circular economy and true sustainability requires novel concepts in all forms of aquaculture. Highly valuable microalgae find application in many nutraceutical products as well as in aquaculture processes and feeds. Effluent from shrimp culture is a major source of nutrient loss from production systems. Even production of shrimp in highly productive biofloc systems loses nitrogenous wastes and phosphate accumulate in biofloc effluent. Recent Research Highlight from the Journal of the World Aquaculture Society High nutrient effluents can offer a suitable growth medium for economically valuable microalgae. The investigators grew the cyanobacteria Arthrospira (Spirulina) platensis in raw and decanted biofloc effluent over 12 and 20 days respectively. There was rapid development of cyanobacterial biomass, faster than growth in a fertilizer medium and fastest in undiluted effluent. Nitrate values varied widely but showed uptake by the cyanobacteria, which also was able to remove 90 percent of phosphate from the effluent. The uptake of nutrients, in particular nitrogen, needs to be better understood in terms of ensuring availability of nutrients to biofloc, in particular, in the operating shrimp system. Nonetheless the results clearly indicate the value of Arthrospira (Spirulina) platensis for the recycling of nutrients in shrimp farming effluents, along with the production of a valuable secondary product. The full issue 53(3) is available at onlinelibrary.wiley.com/ toc/17497345/2022/53/3. —Kenneth Cain, Executive Editor, JWAS
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