Peat water is acidic and nutrient-poor, thus less supportive for aquatic organisms. Lemna sp. has potential as both a phytoremediator and natural feed, but its growth depends on nutrient availability. Catfish waste can be fermented into liquid organic fertilizer (POC), which is rich in nitrogen, phosphorus, and potassium. This study aimed to examine the effect and optimal dosage of catfish-wast…