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| The Current Status of Spawning Grounds for Fishes Spawning as Pelagic Eggs in Reaches f rom Qiyang to Hengnan in Xiangjiang River |
| XIE Wen-xing,TANG Hui-yuan,HUANG Dao-ming,YANG Zhong,YANG Han-yun |
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Abstract A survey on spawning grounds of fishes spawning as pelagic eggs were carried out at the section of Hengnan of Xiangjiang River from April to May in 2010 .A total of 12 species of fish spawning as pelagic eggs were found at the section from 155 .50 km reaches from Qiyang to Hengnan , with the dominant species Squalidus argentatus (Sauvage et Dabry ) , Squaliobarbus ourriculus (Richardson ) , barred loach Parabotia f asciata Dabry , Xenocypris microlepis Bleeker , and culter Erythroculter mongolicus (Basilewsky) .There were 5 spawning grounds at the section reaches ,4 with total length of 26 km at the main stream ,accounting for 16 .72% of the reach from Qiyang to Hengnan ,and 1 at the branch . A total of 672 .8322 million eggs were observed ,only 8 .8704 million eggs of Chinese carp ,representing 1 .32% of the total eggs ,5 .3148 million for grass carp Ctenopharyngodon idellus (Cuvier et Valenciennes ) , accounting for 0 .79% ,3 .4372 million for black carp Mylopharyngodon piceus (Richardson) accounting for 0 .51% , and 118 400 for silver carp Hypophthalmichthys molitrix (Cuvier et Valenciennes ) , accounting for 0 .02% .Spawning behavior and fecundity were related to duration of the fluctuation of the water level ,and the spawning grounds of the fishes spawning as pelagic eggs were found to be reduced from 75 km to 26 km in the length compared with that in the 1970 s .
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Received: 25 February 2014
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