The present study estimated length–weight relationships (LWRs) for six indigenous fish species (Barilius gatensis, Salmostoma acinaces, S. boopis, Puntius amphibius, Hemibagrus punctatus and Ambassis miops) based on specimens collected from River Cauvery (including estuary) during July 2017–January 2020. The sampling surveys were carried out in three distinct sampling seasons, viz., the pre-monsoon (March–May), the monsoon (July–October) and the post-monsoon (November–February). Majority of the fish specimens dealt in the study were collected from multi-meshed monofilament gill nets (mesh sizes 18, 30, 45, 60, 90, 110, 120 and 150 mm) operated by local fishers. For those sites situated in the protected areas, sampling was carried out by cast nets with prior permission from the local administration and the collected fishes were released back into river after length–weight measurements. The length measurements were noted as total length (TL) measured to the nearest 0.1 cm by using a digital Vernier caliper. A digital balance was used for weight measurements with an accuracy of 0.01 g. The study recorded a new maximum length of 48 cm for H. punctatus. The LWR data generated from the present study are significant for proper assessment of the stock status and their management, if collected together with other essential biological and physical parameters.

中文翻译：

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印度考韦里河及其河口六种本土鱼类的长度-体重关系

本研究估计了六种本土鱼类（Barilius gatensis、Salmostoma acinaces、S. boopis、Puntius amphibius、Hemibagrus punctatus和Ambassis miops）的长度-体重关系 (LWR)) 基于 2017 年 7 月至 2020 年 1 月期间从考韦里河（包括河口）采集的标本。抽样调查在三个不同的采样季节进行，即季风前（3 月至 5 月）、季风（7 月至 10 月） ) 和季风过后（11 月至 2 月）。研究中处理的大部分鱼类标本是从当地渔民操作的多目单丝刺网（网目尺寸为 18、30、45、60、90、110、120 和 150 毫米）中收集的。对于位于保护区内的地点，经当地政府事先许可，通过撒网进行取样，并在测量长度重量后将收集的鱼类放回河流。长度测量值记录为使用数字游标卡尺测量到最接近 0.1 厘米的总长度 (TL)。数字天平用于重量测量，精度为 0.01 g。该研究记录了 48 厘米的新最大长度H. 点状。如果与其他基本生物和物理参数一起收集，则本研究产生的 LWR 数据对于正确评估种群状况及其管理具有重要意义。