To address the low trajectory tracking accuracy and limited robustness of conventional reinforcement learning algorithms under complex marine environments involving wind, wave, and current disturbances, this study proposes a proximal policy optimization (PPO) algorithm incorporating an intrinsic curiosity mechanism to solve the unmanned surface vehicle (USV) trajectory tracking control problem. The proposed approach is develop...

Hydrogen peroxide (H₂O₂) is widely used for disinfection in recirculating aquaculture systems (RAS), yet its effects on biofilter performance and fish health remain dosage-dependent. In this study, we evaluated the impacts of weekly H₂O₂ treatments (0, 5, 15, and 30 mg/L) over a 5-week period on water quality, nitrification, and the physiological condition of juvenile Hexagrammos otakii in lab-scale RAS. Low concentration H₂O₂...