Length-weight relationship (LWR) for 39 freshwater fish species captured in the Catalao Lake, a floodplain area at the confluence of the Amazonas and Negro rivers is presented. LWRs were calculated based on fish sampled over 18 years (1999–2017) using a set of ten gill nets with different mesh sizes, monthly immersed in water for 24-hr with 6-hr interval catches. Measurements were done for standard length (SL – 0.1 cm precision) and total weight (TW – 0.01 g precision). The LWRs were calculated by the linear regression of natural log-transformed SL and TW data: TW = a × SLb. All statistical analyses were performed with R software. From all species considered, 32 are new LWR records for the international literature as well as for the Amazonian ichythyofauna; additional records expand the known size range for seven species. © 2020 Blackwell Verlag GmbH

中文翻译：

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亚马逊中部泛滥平原鱼类的体长-体重关系

展示了在加泰罗尼亚湖捕获的 39 种淡水鱼类的长度-重量关系 (LWR)，加泰罗湖是亚马逊河和内格罗河汇合处的洪泛区。LWR 是根据 18 年（1999-2017）采样的鱼计算得出的，使用一组十个不同网眼的刺网，每月浸入水中 24 小时，每隔 6 小时捕获一次。测量标准长度（SL – 0.1 cm 精度）和总重量（TW – 0.01 g 精度）。LWR 是通过自然对数转换的 SL 和 TW 数据的线性回归计算的：TW = a × SLb。所有统计分析均使用 R 软件进行。在考虑的所有物种中，有 32 个是国际文献和亚马逊鱼类群落的新 LWR 记录；额外的记录扩大了七个物种的已知大小范围。