长江流域水生生物资源恢复态势总体向好（美丽中国）

Core Insights - The overall recovery of aquatic biological resources in the Yangtze River Basin is positive, with an increase in integrity index and resource quantity [1][2][4] Group 1: Aquatic Biological Resources - In 2024, the resource quantity in the main stream of the Yangtze River is 2.3 kg per unit, a 9.5% increase from 2023 [1] - A total of 344 indigenous fish species have been monitored from 2021 to 2024, an increase of 36 species compared to the pre-fishing ban period (2017-2020) [1][2] - The water quality assessment in the Yangtze River is rated as excellent, with 98.6% of monitoring sections classified as I-III quality, a 0.1 percentage point increase from 2023 [1] Group 2: Key Protected Species - The distribution of the Yangtze finless porpoise is expanding, and the number of key protected species is increasing, including the first natural reproduction of the rosy bitterling in 30 years [2] - The resource quantity of the four major economic fish species (Qing fish, grass fish, silver carp, bighead carp) in the middle reaches of the Yangtze River is 6.2 times that of the pre-fishing ban in 2020 [2] Group 3: Conservation Efforts - Since the implementation of a comprehensive fishing ban in 2017, biodiversity in the Chishui River has steadily increased, with 117 indigenous fish species monitored from 2021 to 2024 [2][3] - The Chishui River has seen successful artificial breeding of indigenous fish species, with 6.63 million rare indigenous fish released during the 14th Five-Year Plan period [3] Group 4: Challenges in Recovery - Despite the positive trends, the recovery of fish resources and biodiversity in the natural waters of the Yangtze River is still slow, with many indigenous species not yet monitored [4][6] - The Yangtze sturgeon and Chinese sturgeon populations are still facing severe protection challenges, with the Chinese sturgeon not observed to reproduce naturally for eight consecutive years [6] Group 5: Future Actions - To enhance the protection of rare and endangered species, there is a need to optimize and upgrade rescue action plans, including expanding artificial breeding and release efforts for the Chinese sturgeon [6]