Microbiological and physico-chemical studies on some fishes grown in different levels of treated sewage water
2009
Abd El-Hameed, E.A.A. | Gewally, A.M. | Mohamed, G.M. | Abd El-Mageed, S.A.
The effect of different levels of treated sewage water mixing with dechlorinated tap water at concentrations 0.0, 25, and 100% on the microbial load, water quality and some metals (Pb, Cd, Cu and Fe) in water samples and some organs muscle and gills) of Nile tilapia; Oreochromis niloticus and on carp; Cyprinus carpio for 60 days were tested. Fish weight specific growth rate and survival were determined. The results ed a decrease in the total bacterial counts in tap water and at levels of treated sewage water from the 1st day towards the end of the experiment except in complete treated sewage water in which the total bacterial counts were fluctuated throughout all periods. However, the counts of some microorganisms in the fish organs tend to decrease in those reared in dechlorinated tap water and increased in all treated sewage water levels especially at %. The bacterial load in tilapia or carp was the highest in the followed by skin and then muscles. Also, the pathogenic bacteria was recorded high numbers in the gills followed by skin and absent partially in the muscle except in the level 100% sewage water was recorded low numbers. Dissolved oxygen recorded very low concentrations in the treated sewage water (100% sewage water) while BODs reach its maximum. The same trend hold true in nitrates ammonia, total phosphate, total hardness and total alkalinity. The tested heavy metals in the treated sewage water exceedthe permissible limits according to WHO.
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