Fish Respiratory Rate (Gill Opening / Closing) Monitor | 鱼类呼吸频率（鳃盖开合）监测

Through fixed cameras on aquariums, the system analyzes fish gill-cover opening / closing motion video, detects periodic gill opening and closing, and calculates respiratory rate (breaths per minute). | 通过鱼缸固定摄像头，分析鱼类的鳃盖开合运动视频，检测鳃盖的周期性开启和闭合，计算呼吸频率（次/分钟）。当呼吸频率超过正常阈值（例如 > 80 次/分钟，具体依品种和水温而定）时，输出'缺氧预警'，提示用户检查水质（溶氧量）、水温或鱼的健康状态。