Discovery and its significance of spawning grounds of Jinshaiasinensis from upper and middle Jinshajiang River

During April, July to August and November of 2012,three surveys were conducted to estimate the early-stage fish resources in the area of Liyuan power station on Jinshajiang River of Yunnan Province. During the survey conducted at the crossing of Daju Town, Yulong County, Yunnan Province, from July to August, 2012, two egg-tides of Jinshaia sinensis were detected. One was from 8:00 of August 1^st to 10:00 of August 4^th and the other one was from 23:00 of August 9^th to 6:00 of August 13^th. The average egg diameter was 3.89 mm, ranging from 3.37 to 4.41 mm. Natural fertilization and hatching rate as well as abnormality rate in mimic wild environment were 91.5%, 97.1% and 2.2%, respectively. Meanwhile, three spawning grounds had been conjectured, which were Longpan Town, Liming Town and Judian Town of Yulong County, Yunnan Province. Moreover, the total number of eggs from those three spawning grounds during the two egg-tides was approximately 1.49×10⁷ ind.. The discovery of the three spawing grounds is of importance in fullfilling the study of Jinshaia sinensis, and in protecting fish resources under the influences of power stations.