Reservoirs are aquatic resources with the potential to increase India's fish production through inland fisheries. Thippagondanahalli is a medium-size reservoir on Arkavathy River, a tributary of the Cauvery. It is located in Bangalore rural district of Karnataka (12°58′24″ to 12°96'49" N 77°20′33″ to 77°35′63″ E) and has a water surface area of 1162 ha at full reservoir level and 784.55 m at full supply level. Fish diversity studies were conducted to examine the spatial and temporal variations in fish diversity in relation to habitat parameters. A taxonomic abundance of 25 fish species (80% of them native) belonging to 14 families and 4 orders was recorded. A range of statistical estimators such as Chao 1, Jack 1, and Bootstrap were used to assess the expected species richness. The Jack 1 method showed the highest abundance with 28 species. The littoral zone, dominated by small indigenous species, was found to have relatively higher fish diversity (Shannon index-1.86) compared to the limnetic zone of the reservoir. Shannon diversity was higher in the monsoon season (1.76) compared to other seasons. Physico-chemical parameters revealed that this waterbody is highly eutrophic. Canonical correspondence analysis between seasonal habitat characteristics and seasonal species abundance showed the abundance of the small indigenous fish Amblypharyngodon mola during the post-monsoon season, the bottom feeder Cirrhinus mrigala and the surface feeder Rasbora daniconius during the monsoon season, and the carnivores Mystus malabaricus and Channa orientalis as well as the planktivore Puntius sarana during the pre-monsoon season. This study suggests the use of fisheries management and conservation measures such as fish-aggregating devices, stocking of certified seed, and impact assessment of exotic species.

中文翻译：

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印度热带水库与栖息地梯度相关的时空鱼类多样性模式

水库是水生资源，具有通过内陆渔业增加印度鱼类产量的潜力。Thippagondanahalli 是位于 Cauvery 支流 Arkavathy 河上的一个中型水库。它位于卡纳塔克邦班加罗尔农村地区（12°58'24" 至 12°96'49" N 77°20'33" 至 77°35'63" E），全水面面积为 1162 公顷水库水位和完全供应水位 784.55 m。进行鱼类多样性研究以检查鱼类多样性与栖息地参数相关的空间和时间变化。属于 14 个科和记录了 4 个目，使用 Chao 1、Jack 1 和 Bootstrap 等一系列统计估计器来评估预期的物种丰富度。Jack 1 方法的丰度最高，有 28 种。与水库的湖沼区相比，发现以小型本土物种为主的沿海地区具有相对较高的鱼类多样性（香农指数-1.86）。与其他季节相比，季风季节（1.76）的香农多样性更高。理化参数显示，该水体高度富营养化。季节生境特征与季节物种丰度的典型对应分析表明，季风后季风季后本地小鱼 Amblypharyngodon mola 丰度，季风季节底部饲养者 Cirrhinus mrigala 和表层饲养者 Rasbora daniconius 丰度，食肉动物 Mystus malabaricus 和Channa orientalis 以及季风前的浮游动物 Puntius sarana。