RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2021, Vol. 30 >> Issue (4): 861-868.doi: 10.11870/cjlyzyyhj202104009

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Studies on Spatial and Temporal Distribution of Fish Eggs in the Yichang Section in Middle Reaches of the Yangtze River

ZHOU Xue 1, WANG Deng-qiang 1, DUAN Xin-bin 1, LIU Shao-ping 1, CHEN Da-qing 1, GUO Jie 1,2, WANG Ke 1   

  1. (1.Yangtze River Fisheries Research Institute, Wuhan 430233, China;2. Wuxi Fishery College NAU,Wuxi 214081,China)
  • Online:2021-04-20 Published:2021-05-17

Abstract: An investigation was carried out at Yichang section in the middle reaches of the Yangtze River from May to July in 2018 and 2019 to study the status of early-stage fish resources of this river section. The survey focused on the spatial distribution abundance patterns of fish eggs by difference analysis. It turned out that the total of 15 963 eggs was collected. About 24 species of spawning drifting eggs in 4 families in 1 order were identified. The dominant species of fish eggs were Hypophthalmichthys molitrix (32.94% of the total numbers), followed by Pseudolaubuca sinensis (30.80%) and Ctenopharyngodon idellus (12.65%). In 2018, it was estimated that the average density for eggs was 5.61±9.72 ind./100 m 3. In 2019, there was 9.80±16.09 ind./100 m 3. There were significant differences in the main emergence time of different kinds of fish eggs. Difference analysis results showed that there were significant differences(P<0.05) between the drifting density of fish eggs in spatial distribution. In horizontal distribution, the highest density of fish eggs was found at the middle of river(7.54±20.04 ind./100 m 3 in 2018,13.15±25.49 ind./100 m 3 in 2019)and the density of fish eggs at the south of river (6.20±7.92 ind./100 m 3 in 2018, 9.25±14.12 ind./100 m 3 in 2019) was clearly greater than at north of river(3.07±4.71 ind./100 m 3 in 2018, 7.00±11.65 ind./100 m 3 in 2019). In vertical distribution, the density of spawn at surface layer was the lowest. The dispersal characteristics of the fish eggs in the river would be an important support for the study of the location of the spawning ground and the estimation of spawning scale in Yichang section.

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