RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2019, Vol. 28 >> Issue (03): 586-593.doi: 10.11870/cjlyzyyhj201903009

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The Larval Esources of Fishes Spawning  Drifting Eggs in the Lower Reaches of the Minjiang River

LV Hao 1,2,TIAN Hui-wu 1,SHEN Shao-yi 1,2,DUAN Xin-bin 2,LIU Hao-ping 2   

  1. (1. Yangtze River Fisheries Research Institute, Chinese Academy of Fishery Science, Wuhan 430223, China;2. College of Animal and Technology, Southwest University, Chongqing 400715, China)
  • Online:2019-03-20 Published:2019-03-22

Abstract: In order to study the larval resources conditions of fishes spawning drifting eggs in the lower reaches of the Minjiang River, the surveys of fish resources of early life stages were carried out in the lower reaches of the Minjiang River during May 7-July 30, 2016-2017. The results showed that there were 18 species of fish with drifting eggs, among which 8 species were endemic species in the lower reaches of the Minjiang River. They were Leptobotia microphthalrna, Leptobotia elongate, Leptobotia rubrilaris, Xenophysogobio boulengeri, Xenophysogobio nudicorpa, Sinibrama taeniatus, Jinshaia sinensis and Jinshaia abbreviata. Three important spawning grounds of fish with drifting eggs mainly located in the towns of Xijie, Gaochang and Juexi. The largest spawning scale of fish were Leptobotia microphthalrna and Leptobotia elongate, with the egg quantit w 652.75×106 ind. and 368.01×106 ind., respectively. The result of Canonical correspondence analysis showed that the increase of the flow stimulated the spawning of Hypophthalmichthys molitrix and Ctenopharyngodon idellus, as well as decreased the transparency and increased the density. High transparency stimulated the spawning of Rhinogobio typus. As the velocity increased, the drift densit of both the Jinshaia sinensis’s and Jinshaia abbreviata’s eggs  higher.

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