The length‐weight relationship is important for the study of populational dynamics. This study aimed to describe the length‐weight relationships (LWR) of 11 fish species sampled on 18 streams of the Capim river basin on eastern Amazon. Specimens were captured in 2014, 2015 and 2017, using sieve nets with 2 mm of mesh size. Fixed specimens were fixed in 10% formalin and conserved in alcohol 70%, measured for standard length (SL, 0.1 cm) and total weight (W, 0.01 g). The 11 species analysed were: Hemigrammus bellottii, Hemigrammus ocellifer, Hyphessobrycon heterorhabdus, Iguanodectes rachovii, Copella arnoldi, Nannostomus trifasciatus, Apistogramma regani, Apistogramma agassizii, Gymnorhamphichthys rondoni, Hypopygus lepturus, Anablepsoides urophthalmus.

中文翻译：

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巴西卡宾河流域18条溪流中捕获的11种鱼类的长度重量关系

长度与体重的关系对于研究人口动态很重要。这项研究旨在描述从亚马逊东部卡皮姆河流域的18条溪流中取样的11种鱼类的长度重量关系（LWR）。在2014年，2015年和2017年使用网眼尺寸为2毫米的筛网捕获了标本。将固定的样品固定在10％福尔马林中，并保存在70％的酒精中，以测量标准长度（SL，0.1厘米）和总重量（W，0.01克）。分析的11个物种是：半翅目偏虫，半翅目偏虫，Hyphessobrycon heterorhabdus，Iguanodectes rachovii，Copella arnoldi，Nannostomus trifasciatus，Apistogramma regani，Apistogramma agassizii，Gymnorhamphichthys rondoni，Hypops。