In November 2020, researchers from the Endangered Fish Conservation Research Group of the Yangtze River Fisheries Research Institute of the Chinese Academy of Fishery Sciences surveyed the natural breeding of Chinese sturgeon in the process of surveying the fishery resources and environment of the Yangtze River and the monitoring of the natural breeding of Chinese sturgeon at the Yichang station, and the investigation and monitoring of the natural breeding of Chinese sturgeon was monitored. 1 tail. This is in recent years, following the investigation in June 2017 in the Honghu River section to 鳤 (1 tail) After that, the second investigation in the main stream of the Yangtze River was investigated to 鳤. This shows that with the implementation of the comprehensive ban on fishing in the Yangtze River, the threatened fish stocks in the Yangtze River have shown signs of recovery.
Surveyed in Yichang in November 2020 鳤
鳤 (Ochetobiuselongatus) commonly known as Diao Zi, Wheat Straw Diao, belongs to the order Cypriniformes, Cyprinidae, Subfamily Leuciscinae, 鳤 Genus (Ochetobius). Historically, it is widely distributed in the Yangtze River and the rivers and lakes south of it. 鳤 It is a carnivorous fish, feeding on invertebrates, and also preying on some small fish; the largest individual can reach more than 10 kg; the minimum age of sexual maturity is 3 years old; it has the characteristics of river and lake migration, breeding in the main stream rapids in the reproductive season, producing drifting eggs, entering the lakes along the river from July to September every year to fatten, and historically can form fishing floods in some tongjiang lakes in the middle reaches of the Yangtze River, which is an important economic fish.
In recent years, due to overfishing, barriers between rivers and lakes and habitat degradation, 鳤 It has disappeared in many historical distribution areas and has been listed as a provincial key protected aquatic wildlife by Hubei and Hunan.
Scientific research monitoring and investigation
A total of 435 species of fish have been recorded in the Yangtze River Basin. It is understood that the 2017-2019 Yangtze River fishery resources and environmental survey for three consecutive years found that there are 130 species of fish that have been distributed but not collected in history, and many fish stocks are too small, and only occasional records are found at individual survey sites.
According to reports, with the implementation of the comprehensive ban on fishing in the Yangtze River, the 2020 Yangtze River Fishery Resources and Environmental Survey has found that the catch of fishing efforts in catch units has increased significantly compared with 2019. It can be expected that the size of common fish stocks in the Yangtze River will increase significantly in the next few years, and some threatened fish stocks will also recover.
(Guangming Daily all-media reporter Zhou Mengshuang)
Source: Guangming Daily Client