|Online ISSN : 2349-8080
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Water is the most important resource for aquaculture and can be a significant source for contamination. The conditions that fishes are cultured may be potentially stressful, causing existing infections to become more severe and precipitate disease outbreaks which may also compromise the fitness of such fish for human consumption. Heavy metals is one of challenge in reusing of wastewater for aquaculture production, this is because they are non-degradable and often accumulate through trophic level causing a deleterious biological effects.The concentrations of heavy metals in four different locations of fish pond in Ado Ekiti were investigated. The concentration of heavy metals in the fish pond (without a coagulant) ranges from Pb (0.12-0.01mg/l), Cr (0.12-0.47mg/l), Fe (0.14-0.34mg/l), Zn (1.81-1.37mg/l) Cd (0.07-0.02mg/l) and some heavy metals are also detected in the fish sample investigated despite the levels of the heavy metals detected in fish are not remarkable to cause acute health consequences, but chronic adverse health effects due to prolonged bioaccumulation and long term exposure through fish consumption can be inevitable. Treatment of the fish ponds with natural coagulants (chitosan and egg shell) has a greater efficiency on the removal of these pathogenic organisms and heavy metals. From the tested water samples, chitosan from crab shell remove the pathogenic organisms more than the egg shell. The effectiveness of the chitosan may be attributed to the flocculation and bactericidal activities, therefore chitosan and egg shell may serves as substitutes in treatment of fish ponds.