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Biochemical Effects of Sewage Pollution on the Benthic Organism Nerita polita | OMICS International | Abstract
ISSN: 2161-0525

Journal of Environmental & Analytical Toxicology
Open Access

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Research Article

Biochemical Effects of Sewage Pollution on the Benthic Organism Nerita polita

Munyasya JN1,2*, Juma KK1, Burugu MW1, Mburu DN1 and Okuku EO2
1Department of Biochemistry and Biotechnology, Kenyatta University, P.O. Box 43844-00100, Nairobi, Kenya
2Kenya Marine and Fisheries Research Institute, P.O. Box 81651-80100, Mombasa, Kenya
Corresponding Author : Munyasya JN
Department of Biochemistry and Biotechnology
Kenyatta University
P.O. Box 43844-00100, Nairobi, Kenya
Tel: +254721809494
Email: [email protected]
Received June 20, 2015; Accepted July 21, 2015; Published July 25, 2015
Citation: Munyasya JN, Juma KK, Burugu MW, Mburu DN, Okuku EO (2015) Biochemical Effects of Sewage Pollution on the Benthic Organism Nerita polita. J Environ Anal Toxicol S7:006 doi: 10.4172/2161-0525.S7-006
Copyright: © 2015 Munyasya JN et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
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Degradation of coastal ecosystems is an issue of growing concern. Discharges of sewage effluents to sea water is a major contributor to marine pollution. This study examines the biogeochemical effects of sewage pollution on the condition factor and energy reserves of Nerita polita. A total of 135 molluscs were exposed to varying sewage concentrations of between 5%-50%. Physicochemical parameters of the exposure media were characterized using standard techniques. Condition factor of Nerita polita was determined weekly using the Fulton’s index. After the exposure period, the molluscs were sacrificed and energy reserves determined. Increase in sewage pollution resulted in elevation of ammonia (0.01-0.08 mg/L), phosphate (0.05-156 mg/L), nitrates (0.02-1.99 mg/L) and temperature (24.34-25.12oC), while pH (7.75 to 7.29) and dissolved oxygen (5.62-2.38 mg/L) were lowered. There was no correlation between the condition factor of Nerita polita and the sewage pollution. Glucose, lipid and protein concentrations in the mollusc tissues ranged from 29.6-71.3 mg/L, 171-677 mg/L and 338-445 mg/L, respectively, and they decreased along the increasing sewage gradient. Energy reserves in Nerita polita were highest in lipids, followed by proteins and glucose the least and they were affected by the pollution gradient. Findings of this work suggest that energy reserves are sensitive bio indicators but that conditional factor is an unreliable marker to assess acute sewage toxicity. In addition, increase in sewage pollution also leads to a decrease in the water quality and that sewage concentrations above 30% can have profound effects on Nerita polita.