Bioassay of the Ultrastructural characteristics in the kidney and liver of the African catfish, Clariasgariepinus juveniles exposed to graded concentration of zinc

Bioassay of the Ultrastructural characteristics in the kidney and liver of the African catfish, Clariasgariepinus juveniles exposed to graded concentration of zinc



Akaahan T . J., Akogwu S.A., Olabanji F . M.



Bioassay in the structural deformation of the kidney
and the liver of African catfish, Clariasgareipinus exposed to graded
concentration of zinc was determine for a period of 96 hours. The stock
solution was prepared with zinc and the fish juveniles were exposed to
the following concentration in mg/L : 0.5, 0.75. 1.00, 1.25 and 1.50
with a control of 0.0mg/L where the zinc was not introduced. The kidney
and the liver of the dead fish were dissected and subjected to
histology test.The regression plot of the probit value transformed
mortality against the concentration of zinc showed a strong relationship
with the death of the fish exposed to the concentration of the metal
with R2 value of 0.8725. Similarly the regression plot of the percentage
mortality of the fish juveniles with zinc concentration indicate a very
strong relationship with the toxicity of the metal that results to
death of the fish at varied concentration with a R2 value of 0.99754.
All the same probit transformed mortality and the log transformed
concentration of zinc depict a very weak relationship between zinc
toxicity and the lethality of the fish with a very low R2 value of
0.0873. All the same no death was observed in the control throughout the
96 hours period of the study while the lowest death of 15% was recorded
in the 0.5mg/L and the highest of 60% in the 1.50mg/L concentration of
zinc. The LC50 was determined to be 1.25mg/L during the study time. The
result of the bioassay in the ultrastructural characteristics showed
pathological lesion in the kidney and vacuolation of the hepatocytes of
liver of the fish. The DO of the water was below the recommended level
for the survival of the fish in the waters that the concentration of
zinc was introduced and may cause distress to the fish. The fish showed
erratic movement and distressful behavoiur where they were exposed to
zinc and eventually the ones that could not tolerate the toxicity of the
metal died. The study conclude that the fish should not be exposed to
the elevated concentration of zinc as it is toxic and recommend that
anthropogenic activities that release zinc into the environment should
be controlled. 



10.22161/ijeab/1.3.22



http://ijeab.com/upload_document/issue_files/22%20IJEAB-SEP-2016-21-Bioassay%20of%20the%20Ultrastructural%20characteristics%20in%20the%20kidney%20and%20liver%20of%20the%20African%20catfish,%20Clariasgariepinus%20juveniles%20exposed%20to%20graded%20concentration%20of%20zinc.pdf



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