The present work seeks to characterize the fish landings in the period pre and post-installation of the “Santo Antônio” hydroelectric and analyze its effects on the fishing dynamics in the Humaitá municipality, South Amazonas. The analysis considered two periods: Before the dam (BD) with data produced between 2009 and 2010; and after the dam (AD) with data produced between May 2018 and April 2019. Descriptive and non-parametrical statistics were performed to identify possible effects of the power plants on the fish assemblages. The results show that the installation of the hydropower plants negatively affected the capture dynamics of several fish species by changing the capture periods and spots previously recorded in the BD. In other words, several fishing grounds stopped being productive, leading fishermen to look for new and more distant fishing areas in different times of the year. Considering that this kind of investment, especially in the Amazon, is a trend, the expansion of refined fish monitoring programs to other regions is indispensable for determining future changes in the spatial/temporal gradients of captures, and how the socioeconomic and other socioenvironmental characteristics of the fishing activity are affected by this type of power project.

目前的工作旨在描述“圣安东尼奥”水电站安装前后的鱼类上岸量特征，并分析其对南亚马逊州胡迈塔市渔业动态的影响。该分析考虑了两个时期：大坝建设之前 (BD)，数据在 2009 年至 2010 年期间生成；以及大坝之后（AD），使用 2018 年 5 月至 2019 年 4 月期间生成的数据。进行了描述性和非参数统计，以确定发电厂对鱼类组合可能产生的影响。结果表明，水力发电厂的安装通过改变先前记录在BD中的捕获期和地点，对几种鱼类的捕获动态产生了负面影响。换句话说，一些渔场停止生产，导致渔民在一年中的不同时间寻找新的、更远的捕鱼区。考虑到这种投资，特别是在亚马逊地区，是一种趋势，将精细的鱼类监测计划扩展到其他地区对于确定捕捞的空间/时间梯度的未来变化以及捕捞的社会经济和其他社会环境特征如何变化是必不可少的。捕鱼活动受到此类电力项目的影响。