Assessment of Nutrients and Particulate Organic Matter in Freshwater Fishponds at Krishna-Godavari Delta, India.

Author(s): Satyavathi Chinthada* and Seshagiri Bandla

Abstract: Pollution in freshwater ecosystems leads to the eutrophication, which results in high phytoplankton biomass, structural losses to aquatic habitats, low oxygen availability and at times logged toxic waters. Altogether nine freshwater fishponds were taken for the study, which are located at Krishna- Godavari delta. The main aim of this study is to understand the water quality variations on a time scale along with the particulate organic matter and some account on bacterial abundance. Multivariate Euclidean cluster analysis isolated the entire year January 2016 to December 2016 into three significant seasons such as pre-monsoon (March-June), monsoon (July to October) and post-monsoon (November to February). Water temperature (24.12±0.88°C), dissolved oxygen (3.42±0.08 mg/litre), total alkalinity (154.19±0.15 mg/litre) and dissolved nutrients were observed with respect to the seasons and type of fish culture. The total bacterial abundance of water varied between 1.33±0.22 CFU/Ml*105 and 7.01±05 CFU/Ml*105. Whereas, heterotrophic bacteria are positively linear correlated to the total bacterial count, which ranged from 0.52±0.12 CFU/Ml*105 to 5.71±0.5 CFU/Ml*105 and constituted 39.12 to 81.45% of total bacterial communities during the observed seasons. This study can be considered as a model to assess the freshwater ponds to understand the water quality variations due to the accumulation of organic deposits influences the bacterial growth.

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