Group 1 - The Chinese sturgeon is a flagship species of the Yangtze River and is considered a rare and ancient fish, known as the "treasure of water China" [1] - The population of wild Chinese sturgeons has been declining, with no natural breeding activity observed for eight consecutive years, leading to an emphasis on artificial breeding and release as a key conservation strategy [1] - In 2024, the release scale of Chinese sturgeons is expected to exceed 1 million, with approximately 110,000 juvenile fish already entering the ocean through the Yangtze River estuary [1] Group 2 - On June 6, "National Fish Release Day," 24 cities including Wuhan, Chongqing, and Changsha conducted simultaneous "scientific release" activities, releasing 500,000 rare and endangered fish, including Chinese sturgeons [2] - Prior to release, Chinese sturgeons are kept in temporary holding pools to adapt to the Yangtze River's water environment, and they are equipped with ultrasonic monitoring devices that do not harm them [2] - Monitoring data from 2024 indicates that 50% of released sturgeons aged five and above reached the Yangtze River estuary, demonstrating the effectiveness of the release program in supplementing wild populations [2] Group 3 - To accurately assess the adaptation of released Chinese sturgeons, ultrasonic receiving devices were installed to monitor their distribution and migration patterns in the Yangtze River [3] - The core objective of the newly installed devices is to track the arrival time of marked sturgeons at the Yangtze River estuary and evaluate their survival adaptability and release effectiveness [3] - A total of 49 high-precision ultrasonic receiving devices have been installed along the Yangtze River to cover the entire migration path of the Chinese sturgeon [3]