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首页> 外文期刊>African Journal of Aquatic Science >Fish distributions in the Rondegat River, Cape Floristic Region, South Africa, and the immediate impact of rotenone treatment in an invaded reach.
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Fish distributions in the Rondegat River, Cape Floristic Region, South Africa, and the immediate impact of rotenone treatment in an invaded reach.

机译：南非开普弗罗里斯海角地区Rondegat河中的鱼类分布，以及鱼藤酮治疗对入侵地区的直接影响。

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摘要

Alien fishes are considered the most serious threat to native headwater stream fishes in South Africa. A 4 km reach of the Rondegat River is the first section of a South African river to be rehabilitated through the attempted removal of alien fish by using the piscicide rotenone. The objectives of the current study were to establish the distribution and relative abundance of native and alien fish prior to treatment, and to assess the immediate impact of the treatment on the fish population. Forty-three sites were sampled using backpack electrofishing, snorkel transects and underwater video analysis. In the invaded lower reaches, native Labeobarbus capensis was detected only at very low densities, while three other native fish species were not detected. Alien fish were not detected above a barrier waterfall 5 km upstream of the river's confluence with a reservoir. The fish density of 97 fish per 100 m2 in non-invaded reaches was more than an order of magnitude higher than that of 7 fish per 100 m2 in the invaded reach. A total of 470 Micropterus dolomieu and 139 L. capensis were removed from a 4 km treatment zone during the rotenone operation. No fish were detected in this area after the rotenone treatment.
机译：外来鱼类被认为是对南非原生河源鱼类的最严重威胁。 Rondegat河的4公里是南非河的第一部分，这是通过使用杀鱼剂鱼藤酮尝试清除外来鱼类而修复的。当前研究的目的是在处理之前确定本地和外来鱼类的分布和相对丰度，并评估处理对鱼类种群的直接影响。使用背包电钓鱼，浮潜样带和水下视频分析对43个地点进行了采样。在入侵的下游地区，仅在非常低的密度下才检测到了天然Labeobarbus capensis，而未检测到其他三种本地鱼类。在河流与水库汇合处上游5公里处的障碍瀑布上方未检测到外来鱼类。非侵袭河段每100 m 2 97条鱼的密度比侵袭河段每100 m 2 7条鱼的密度高一个数量级。 。在鱼藤酮手术期间，从4 km处理区中总共去除了470个dolopeueu和139 L. capensis。鱼藤酮处理后在该区域未检测到鱼。

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