Karatas, BoranCakmakci, CihanYucel, Elif SenaDemir, MuhammetSen, Fazil2025-07-302025-07-3020261303-27122149-181X10.4194/TRJFAS276222-s2.0-105010730867https://doi.org/10.4194/TRJFAS27622Karatas, Boran/0000-0003-4353-1293Dissolved oxygen (DO) is a vital parameter in intensive rainbow trout aquaculture, directly influencingfish growth, health, and survival. As such, accurate monitoring and prediction of DO levels are crucial for ensuring sustainable and efficient aquaculture practices. This study assessed and compared the predictive performance of four machine learning algorithms Multivariate Adaptive Regression Splines (MARS), Random Forest (RF), Extreme Gradient Boosting (XGBoost), and Averaged Neural Networks (avNNet) in estimating DO concentrations based on a range of water quality parameters. A total of 120 samples were collected from 12 rainbow trout farms across T & uuml;rkiye. The input variables included suspended solids, electrical conductivity, turbidity, nitrate, nitrite, ammonia, ammonium, orthophosphate, pH, water temperature, and total phosphorus. DO levels ranged between 8 and 15 mg/L. Model performance was evaluated using Mean Absolute Error (MAE), Root Mean Square Error (RMSE), Mean Absolute Percent Error (MAPE), and the coefficient of determination (R2). All models demonstrated strong predictive accuracy, with XGBoost achieving the best overall performance (MAE: 0.44, RMSE: 0.58, MAPE: 0.04, R2: 0.78), followed by RF, avNNet, and MARS. These findings highlight XGBoost as a robust predictor of dissolved oxygen levels in aquaculture systems, which may contribute to improving water quality management and increasing productivity in rainbow trout aquaculture.eninfo:eu-repo/semantics/openAccessAquacultureMachine LearningRainbow TroutWater QualityArticle261Q2Q2WOS:001565811700001