This study aimed to estimate the parameters of the length-weight relationship for 12 freshwater fish species that inhabit lakes in the Negro River basin (Amazonas state, Brazil). The fishes were sampled using gillnets (15 × 2 m, mesh size 30–100 mm between knots), during the hydrologic cycle: low water (dry), flooding, high water (flood), and receding water, from 2008 to 2010, 2012 and 2013. The gillnets were placed in the lakes with a standardized period of 24 hr, with fish removal occurring every 12 hr (2010 to 2010) and 6 hr (2012 and 2013). Measurements were taken for standard length (SL – 0.1 cm precision) and total weight (TW – 0.1 g precision). The parameters a and b of the equation WT = a.LT^b were estimated. This study also provides new data on of maximum lengths for three species.

中文翻译：

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巴西亚马逊内格罗河流域中下游捕获的12种淡水鱼的体长-体重关系

本研究旨在估计栖息在内格罗河流域（巴西亚马逊州）湖泊中的 12 种淡水鱼类的长度-体重关系参数。在 2008 年至 2010 年的水文循环中，使用刺网（15 × 2 m，网目尺寸 30-100 mm）对鱼类进行采样：低水位（干）、洪水、高水位（洪水）和后退水， 2012 年和 2013 年。将刺网放入湖中，标准时间为 24 小时，每 12 小时（2010 年至 2010 年）和 6 小时（2012 年和 2013 年）清除一次鱼。测量标准长度（SL – 0.1 cm 精度）和总重量（TW – 0.1 g 精度）。方程的参数a和b WT = a.LT ^b估计。这项研究还提供了三个物种最大长度的新数据。