Abstract

Cirrhinus mrigala is an Indian major carp originally inhabitant of the Ganga River system in Northern India. There is paucity of knowledge on age and growth of this commercially important species from Ganges basin. To fulfill this gap, 250 samples of C. mrigala were collected from the main channel of Ganga River and its five major drainages to evaluate intra-basin variations in age and growth composition. Maximum 8+ year age class was recorded from River Betwa. Back-calculation method revealed significant variation (p < 0.05) in different year age classes among the studied rivers. With increase in age, specific rate of linear growth (C_l) and specific rate of weight (C_w) decreased in all the studied rivers. This study will provide new baseline information to fisheries biologists on the current status of biological attributes of C. mrigala across the River Ganga basin.

中文翻译：

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印度恒河盆地六条河流中印度主要鲤鱼的年龄和生长，Cirrhinus mrigala（汉密尔顿，1822 年）（鲤形目：鲤科）

摘要

Cirrhinus mrigala是一种印度主要鲤鱼，最初栖息在印度北部的恒河系。对恒河盆地这一具有重要商业价值的物种的年龄和生长情况知之甚少。为了填补这一空白，我们从恒河主河道及其五个主要水系收集了250 个C. mrigala样本，以评估流域内年龄和生长成分的变化。最大 8 岁以上年龄组记录在 Betwa 河中。反算法显示，所研究河流的不同年龄等级存在显着差异（p < 0.05）。随着年龄的增加，比线性生长率（C _l）和比体重率（C _w) 在所有研究的河流中下降。这项研究将为渔业生物学家提供有关恒河流域C. mrigala生物属性现状的新基线信息。