长江中游鱼类资源量的估算

为了解长江中游的鱼类资源现状,于2018年5和6月以及9和10月在宜昌、石首、洪湖、武汉和湖口5个江段进行了渔获物调查工作。通过统计各江段的渔业捕捞情况,计算年捕捞量。用体长股分析方法,对铜鱼(Coreius heterodon)、鳊(Parabramis pekinensis)和瓦氏黄颡鱼(Tachysurus vachelli)的资源量进行估算,并以此推算各江段的鱼类总资源量。结果显示,宜昌江段的鱼类年总资源量1077.36 t,其中,铜鱼为623.25 t;石首江段的年总资源量为2190.74 t,铜鱼为698.19 t;洪湖江段的鱼类年总资源量为58.57 t,其中,瓦氏黄颡鱼为0.41 t;武汉江段的鱼类年总资源量1010.54 t,其中,鳊为148.65 t;湖口江段的年鱼类总资源量14.55 t,瓦氏黄颡鱼为0.032 t。估算结果可以为长江中游鱼类资源保护措施的制定提供数据参考。

Estimation of Fish Resources in Middle Reaches of Yangtze River

An investigation of commercial fishing was carried out in the middle reaches of the Yangtze River with the purpose to study the status of fish resources in May-June and September-October 2018.Total fish catch was estimated based on the fishery statistic data.The length-structure VPA method was applied to evaluate the stock size of Coreius heteroteron,Parabramis pekinensis and Tachysurus vachelli.The biomass of the firstly five species were 1077.36 tones,2190.74 tones,58.57 tones,1010.54 tones,and 14.55 tones.The total fish biomass for reaches of Yichang City,Shishou City,Honghu City,Wuhan City and Hukou County were 623.25 tones,698.19 tones,0.41 tones,148.65 tones and 0.032 tones(Table 2-6),respectively.The results may provide information for assessing protection potentiality and developing fish resource conservation strategy.