葛洲坝下中华鲟产卵场食卵鱼资源量的调查和分析

Estimation on abundance of egg-predatory fishes in the spawning ground of Chinese sturgeon below the Gezhouba Dam

为了解葛洲坝下游中华鲟（Acipenser sinensis）产卵场食卵鱼的资源量，于2011年8—12月在葛洲坝下游江段，利用三层流刺网张网采集渔获物样品并进行鉴定分类。结果显示：采集渔获物共有24亚种，分属于3目5科，其中鲤形目鲤科鱼类最多，共有14种，未发现外来物种。食卯鱼铜鱼（Coreius heterodon）和瓦氏黄颡鱼（Pelteobagrus vachelli）在所捕获渔获物中所占比例较大，其中瓦氏黄颡鱼（Pelteobagrus fulvidraco）的捕捞量占总捕捞量的79．31％；在11月份的捕获物中，食卯鱼的捕捞数量足过10月和12月的2～8倍；在中华鲟产卵期间，食卵鱼的日捕获量达到最高峰。

From August to December, 2011, assessment on the species and monthly change of abundance of predatory fishes, together with daily abundance change of predatory fishes during spawning season were conducted through commercial fisheries surveys by drifting net and trap net in the reach below the Gezhouba Dam where the spawning ground of Chinese sturgeon located. There were 24 subspecies of fish, which belonged to 3 orders 5 families. Among the catches, 14 species were cyprinidae and no exotic species were found. Coreius heterodon and Pelteobagrus vacheUi composed the major part of the catches, and the amount of P. vachelli occupied 79.31% of the total amount. The amount of egg-predatory fishes in November was more than of that in October and December, and it reached the peak at the spawning period.