Dissolved Oxygen and BOD in Lakes: 2025 Zoology Thesis Excerpt
Introduction:
An introduction to topic”Dissolved Oxygen (DO) and Biochemical Oxygen Demand (BOD) in Freshwater Lakes” Understanding the balance between oxygen supply and demand in aquatic systems is crucial for assessing water quality and aquatic life sustainability.
This excerpt from a 2025 zoology thesis explores how seasonal changes, microbial activity, and decomposition affect dissolved oxygen (DO) and biochemical oxygen demand (BOD) levels in Indian freshwater lakes and rivers.
Table of Contents
Excerpt Section:
“The main source of oxygen in aquatic habitats is the atmosphere, rainfall, and respiration of aquatic organisms. Dissolved oxygen levels are considered an important measurement of water characteristics and an index of water bodies able to support desirable aquatic life.
Dissolved oxygen levels are seen as a key sign of water quality and bodies of water that can support desirable aquatic life (Harney et al., 2013).”
“Dissolved oxygen in a water body depends upon water temperature, amount of dissolved salt, and pressure of gases.
In the Oinyi River in Nigeria, Meme et al., (2014) reported the DO level was between 6.02 and 7.01 mg/l.”
“Pandit et al., (2022) express the co-relation between D.O. and B.O.D. in study at Suraj Kund and Rani Pond in India. They found the lowest D.O. level and highest B.O.D in comparison to winter and monsoon season.”
“Natural water pond requires carbon dioxide to work properly. The majority of CO2 is produced by decomposition of organic matter and respiration of aquatic life.”
“The presence or absence of CO2 on the surface of a water body depends on the photosynthesis of minute aquatic plants.
The change of CO2 levels in the water is due to photosynthesis, respiration, organic decomposition, and runoff.”
“BOD, which stands for ‘Biochemical Oxygen Demand,’ is the amount of oxygen that bacteria and other microorganisms use when the conditions are aerobic.
Parekh and Gadhvi (2015) investigated BOD is higher during September and lower during February which is varied from 4.68 mg/L to 5.98 mg/L in seawater, Mithivirdi coast Bhavnagar west coast of India.”
“Aher and Aher (2020) reported higher BOD in the summer and lower in the winters because of presence of less amount of solid water and few numbers of microorganisms in the Godavari River, Maharashtra.”
“Potharaju R. and Aruna M. (2021) investigated the maximum concentration of BOD 10 mg/l in April (summer) and the minimum of 2.62 mg/l in August in Medchal Lake in Telangana.”
“The metabolic activity of microbes increases because of the higher temperature of the aquatic body.”
Source Citation:
- Researcher’s full name: Siddharth University
- Thesis title: Seasonal Variations in Hydrological Parameters and Status of Fish Diversity in Bichnaiyya Lake Wetland of District Basti UP India
- University and Department: Siddharth University, Department of Zoology
- Year of submission: 2025
- Page number: Page 12
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