Fish Flashing & Scraping Detection (Ectoparasite Warning) | 鱼类擦缸/蹭底行为识别（外寄）

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Through fixed aquarium cameras, the system analyzes fish behavior videos and detects abnormal frictional actions between fish bodies and tank walls, substrate, or rockwork — 'flashing' (fish flipping sideways and brushing tank walls rapidly) and 'scraping' (fish belly/flank rubbing on substrate). The system counts abnormal contact frequency per minute. | 通过鱼缸固定摄像头，分析鱼类的行为视频，检测鱼体与缸壁、底砂、造景石等物体的异常摩擦动作（擦缸：鱼体侧身快速蹭过缸壁；蹭底：鱼体腹部或侧面贴底砂摩擦）。统计每分钟的异常接触频次，当频次超过阈值（默认 5 次/分钟）且持续时间超过 10 秒时，输出'外寄风险提示'，提醒用户检查是否有寄生虫（如小瓜虫、车轮虫、三代虫）感染或皮肤不适。