Using multivariate analysis of water quality in RAS with Nile tilapia (Oreochromis niloticus) to model the evolution of macronutrients

► We used multivariate analysis to model the evolution of water quality in tilapia. ► Random regression analysis produced equations to determine accumulation rates. ► The accumulation of each variable was described in relation to stocking density. ► Temporal variations of ion concentrations were described by PCA. ► Changes in water chemistry explain most of the variability in ion concentration.