Support capacity of a floodplain lake for intensive fish production (Rondônia, Brazil)

Abstract The Amazon Basin stands out mainly for its large floodplain’s areas, which during the period of high water become important environments for the maintenance of the life cycle of many fish species. These floodplains act as a source of food and an area for growth and reproduction for the fish assemblages. However, there are few studies on the use of floodplain lakes for breeding fish in confinement. Therefore, we analyzed the support capacity and environmental parameters of Lake Cujubim, in the Madeira River Basin, regarding its use for the implementation of intensive fish farming (net tank system). From 2019 to 2020, bathymetric profiles and limnological data were collected, considering the seasonality of the water level and the shape of the Lake Cujubim. The bathymetry data were primarily used to verify the parameters of depth, area and volume of the lake, while limnological data contributed to statistical analyses for the evaluation of health status and support capacity of the lake for fish farming in an intensive production system. The data collected from the limnological analyses and the depth and profile indicate that Lake Cujubim is suitable for the cultivation of fish, and has an estimated support capacity for an annual production of up to 468.31 tonnes of fish. Herein, we propose a viable alternative for the social and productive development of intensive fish farming in an area of floodplain lake in the state of Rondônia, Brazil.

摘要 亚马孙盆地（Amazon Basin）最为突出的特征是拥有广袤的洪泛平原区域，在高水位季节，此类区域成为维系众多鱼类物种生命周期的关键生境，可为鱼类群落提供食物来源，并作为其生长与繁殖的场所。然而，目前针对洪泛平原湖泊开展封闭式鱼类养殖的相关研究仍较为匮乏。为此，本研究以马代拉河流域（Madeira River Basin）的库朱宾湖（Lake Cujubim）为对象，评估其应用于集约化鱼类养殖（网箱系统）的环境参数与承载能力。2019年至2020年，本研究结合库朱宾湖的水位季节变化与湖体形态特征，采集了水深剖面与湖沼学相关数据。其中，水深数据主要用于测算湖体的水深、面积与容积参数；湖沼学数据则用于开展统计分析，以评估该湖在集约化养殖系统中的健康状态与承载能力。湖沼学分析结果与水深、剖面数据均表明，库朱宾湖适宜开展鱼类养殖，其预估年鱼类承载产能可达468.31吨。本研究可为巴西朗多尼亚州洪泛平原湖泊区域的集约化鱼类养殖社会与产业发展提供可行方案。