Abstract：

This study investigates the role of ecological purification structures in regulating water quality in a multi-level low-temperature recirculating water system for oyster temporary rearing. A composite purification system incorporating ecological wetlands, bio-filtration layers, and other modules was constructed. Comparative analysis was performed between the experimental and control groups in terms of water quality parameters, oyster growth, and survival rate. Results indicated that the ecological purification structures significantly reduced concentrations of pollutants such as ammonia nitrogen, nitrite, and total phosphorus, while improving dissolved oxygen levels. Oyster growth rate and survival were markedly enhanced. The study also proposed optimization strategies, including filler configuration, plant combination, and intelligent monitoring, providing theoretical support and technical pathways for ecological and intelligent development of shellfish temporary rearing under low-temperature conditions.

Key Words：

oyster temporary rearing; ecological purification structure; low-temperature recirculating water system; water quality regulation; growth performance; intelligent aquaculture