长江流域水生生物资源恢复态势向好 四大家鱼卵苗资源量是2020年的6.2倍

Core Insights - The overall recovery of aquatic biological resources in the Yangtze River Basin is positive, with a significant increase in resource quantity and diversity observed in 2024 compared to previous years [1] Group 1: Resource Quantity - The unit resource quantity of the Yangtze River main stream in 2024 is 2.3 kilograms, representing a 9.5% increase from 2023 [1] - The resource quantity of the four major fish species (Qing fish, Grass fish, Silver fish, and Bighead fish) at the monitoring section in the middle reaches of the Yangtze River is 8.32 billion larvae, which is 6.2 times that of the pre-fishing ban in 2020 [1] Group 2: Biological Integrity and Diversity - The aquatic biological integrity index in the Yangtze River Basin continues to improve, with the index for the Chishui River rated as "good" for three consecutive years [1] - The species diversity level is steadily recovering, with a total of 344 indigenous fish species monitored from 2021 to 2024, an increase of 36 species compared to the pre-fishing ban period (2017 to 2020) [1] - The natural reproduction of the rosy bitterling fry has been observed in the Yangtze River for the first time in over 30 years [1] Group 3: Habitat Conditions - The overall habitat conditions are stable, with the water quality assessment of the main and tributaries of the Yangtze River rated as excellent in 2024, where 98.6% of the water quality sections fall into categories I-III, an increase of 0.1 percentage points from 2023 [1]