Current status of spawning grounds of fish with pelagic eggs in the middle reaches of Hanjiang River
Current status of spawning grounds of fish with pelagic eggs in the middle reaches of Hanjiang River
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发表时间：
2006
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通讯作者：
Li Xiu-feng;Huang Daoming;Xie Wen-xin;X. Shan;Chang Xiuling;Yang Hanyun;Zhang You-qian;He Jia-qing
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作者：
Li Xiu-feng;Huang Daoming;Xie Wen-xin;X. Shan;Chang Xiuling;Yang Hanyun;Zhang You-qian;He Jia-qing
A survey on a status of spawning ground of fish with pelagic eggs was carried out in the middle reaches of Hanjiang River from May to August in 2004.It was found that there were 16 species of fish with pelagic eggs including some commercial fishes such as grass carp Ctenopharyngodon idellus,black carp Mylopharyngodon piceus,silver carp Hypophthalmichthys molitrix(Cuvieret Valenciennes),bighead carp Aristichthys nobilis(Richardson),bream Parabramis pekinensis(Basilewsky),and Squaliobarbus curriculus(Richardson) in the middle reaches of Hanjiang River.Temperature,discharge,current velocity,and period when freshet maintains in the river significantly impacted reproduction and fecundity of the fish.Both 11 spawning sites of commercial fish with floating eggs and 20 spawning sites of small fish was found in the middle reaches of Hanjiang River and one of its tributaries-Tangbai River.There were 0.57% of four major Chinese carps,the 2.23% of other commercial fishes and the 97.2% of small fish in 16.326 billion of pelagic eggs in the mainstream of Hanjiang River. Meanwhile,there were the 0 of four major Chinese carps,the 14.15% of other commercial fish and the 85.85% of small fish in its tributaries-Tangbai River.In comparison with the data in 1970s,the fish with pelagic eggs decreased by 9 species,all of which belonged to commercial fish species.The number of the fish eggs in the middle reaches of Hanjiang River increased by 2.59 times,but the total eggs in its tributaries-Tangbai River decreased by 76.17%.The four major Chinese carps decreased by 89.97%,and other commercial fish decreased by 80.17%.Two important spawning sites of the commercial fish situated in Wangfuzhou and Xiangfan in the mainstream of Hanjiang River and 12 species of commercial fish in the tributaries-Tangbai River were disappeared,but the egg number of the small fish increased by 9.48 times.
