Assessment of Temporal Variation of Water Quality Parameters and the Trophic State Index in a Subtropical Water Reservoir of Bangladesh
Open Access
- 30 September 2021
- journal article
- Published by The Grassroots Institute in Grassroots Journal of Natural Resources
- Vol. 4 (3), 164-184
- https://doi.org/10.33002/nr2581.6853.040313
Abstract
This study was conducted to determine the suitability of water quality for fisheries management in Kaptai Lake from February 2019 to January 2020. Results showed that the temperature, transparency, TDS, pH, DO, EC, alkalinity and hardness were 20.9 to 31.8°C, 17 to 303 cm, 40 to 105 mg/L, 6.82 to 7.96, 6.1 to 7.65 mg/L, 75.33 to 172.33 µS/cm, 37 to 83 mg/L and 35 to 190 mg/L, respectively. However, nutrients as NH3, NO3-, NO2-, PO43- and SO42- were 0.01 to 0.05, 0.03 to 2.21, 36 to 96, 0.01 to 0.04 and 0.3 to 1.9 mg/L, respectively. Chlorophyll a and trophic state index (TSI) were 0.70 to 2.12 µg/L and 27.43 to 37.79, respectively. Study revealed that SO42-, DO and TDS were higher than the standard of ECR. On the other hand, NH3, NO3-, NO2-, PO43-, temperature, transparency, pH, EC, total hardness, total alkalinity, Chlorophyll a and TSI were within the standard levels. Concentrations of NO3-, NO2-, PO43-, Chlorophyll a and TSI (CHL) showed no significant variation with seasons. Conversely, TDS, transparency, EC, alkalinity, hardness, and SO42- were lower in monsoon compared to pre-monsoon and post-monsoon seasons. Besides, temperature, NH3, DO and TSI (SD) were higher in monsoon season. Results concluded that the Kaptai Lake is in mesotrophic condition with TSI (CHL) less than 40, and prominently there was a positive relationship between Chlorophyll a and Trophic State Index (TSI). In this regard, major nutrients and Chlorophyll a concentration in the Kaptai Lake may have an impact on the aquatic environment.Keywords
This publication has 32 references indexed in Scilit:
- Nutrient dynamics in the Sundarbans mangrove estuarine system of Bangladesh under different weather and tidal cyclesEcological Processes, 2013
- Algae community and trophic state of subtropical reservoirs in southeast Fujian, ChinaEnvironmental Science and Pollution Research, 2012
- Study of the seasonal variations in Turag river water quality parametersAfrican Journal of Pure and Applied Chemistry, 2012
- Weekly dynamics of phytoplankton functional groups under high water level fluctuations in a subtropical reservoir-bayAquatic Ecology, 2010
- Fish and Fisheries of Kaptai Reservoir, BangladeshPublished by Wiley ,2002
- GENETIC ANALYSIS OF CHLOROPHYLL BIOSYNTHESISAnnual Review of Genetics, 1997
- A trophic state index for lakes1Limnology and Oceanography, 1977
- The phosphorus‐chlorophyll relationship in lakes1,2Limnology and Oceanography, 1974
- Limnology of Lake Bogakain, Bandarban, BangladeshBangladesh Journal of Botany, 1970
- Physico-chemical aspects of Chandbill Oxbow lake of Meherpur, BangladeshDhaka University Journal of Biological Sciences, 1970