Prawn sludge can become a category 2 subproduct. EU commision incorporates aquaculture sludge into sub-product regulations…

https://www.mispeces.com/noticias/La-Comision-Europea-incorporara-los-efluentes-de-acuicultura-dentro-del-reglamento-de-subproductos/#.YovY0FPRYu9

De-stressing your prawn culture – solution in intensive RAS is removing waste feed plus shells and using UV to moderate vibrio in tank…

https://www.globalseafood.org/advocate/an-update-on-vibriosis-the-major-bacterial-disease-shrimp-farmers-face/

ShrimpLab exposé – the Alien Crab Prawn bottom cleaner – wet wipes used initially also – 2010

2010 tests – 500w range 20 metre diameter tanks. 24/7.
2020 tests – Brushed filter skirt – airlift support.