布哈河青海湖裸鲤鱼苗鱼卵的时空分布研究

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Abstract

Spatial and temporal distribution of fish larvae in the Buha River, Qinhai Lake was investigated from 1 July to 6 October, 2008 by sampling with hydrographic cableways and conical nets.The results showed that almost all fish larvae were Gymnocypris przewalskii.Fish fry mainly appeared in July, with the average density of 3.17 ind.·m³, and max density of 54 ind.·m³.There were significant differences in the density between the day from 14:00 to 14:10 and the night from 22:00 to 22:10(a=0.05, F=6.13, P=0.014).Fish larvae mainly drifted in the night, and fish fry mostly distributed near the surface and the density of fish fry near shore was higher than the density in river center, while fish eggs mostly distributed near the bottom of river.The density of fish eggs was significantly different, with 0.075 ind.·m³ in the surface, while 0.175 ind.·m^-3 in the bottom(n=ll, F=4.73385, P=0.04174).Sectional coefficient offish fry and fish eggs was 0.43 and 2.32 respectively.It is very important to understand the characteristics of spatial and temporal distribution of Gymnocypris przewalskii for larval resource investigation and protection.

Key words： Gymnocypris przewalskii Buha River fish larvae spatial and temporal distribution

Received: 25 October 2009

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	Articles by authors
	ZHANG Hong
	TAN Xi-chang
	SHI Jian-quan
	YANG Jian-xin
	QI Hong-fang
	LI Xin-hui

Cite this article:

ZHANG Hong,TAN Xi-chang,SHI Jian-quan, et al. Spatial and temporal distribution of Gymnocypris przewalskii larvae in the Buha River of the Qinghai Lake[J]. , 2009, 28(5): 443-447.

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http://www.ecolsci.com/EN/ OR http://www.ecolsci.com/EN/Y2009/V28/I5/443

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