Combined Toxicity and Bioconcentration of Fluoride and Arsenic in African Catfish Clarias gariepinus (Burchell, 1822)

Combined Toxicity and Bioconcentration of Fluoride and Arsenic in African Catfish Clarias gariepinus (Burchell, 1822)



Gamini Sahu, Shamsh Pervez, Aditi Niyogi Poddar



Laboratory experiments were performed to examine the
combined toxic effects of two important aquatic contaminants viz.,
arsenic and fluoride on African catfish, Clarias gariepinus.
Additionally, the bio concentration factors (BCFs) of the two
contaminants in tissues and blood of catfish were also determined. The
LC50 for sodium fluoride and arsenic trioxide were determined to be
619.3 mg L-1, 30.3 mg L-1, respectively. Erratic swimming movements with
hyperactivity, loss of equilibrium, augmented air gulping and decreased
food consumption were observed in the experimental groups. In
co-exposure groups of arsenic and fluoride, the concentration of
fluoride in fish tissues increased with increasing water fluoride
concentration in the test aquaria with significant differences
(P<0.01) between different groups. Also significant differences
(P<0.05) in tissue concentrations of arsenic between groups were
observed in response to different concentrations of water arsenic.
However, the differences in blood fluoride and arsenic concentrations
were not significantly dissimilar (P>0.05) among the exposure groups.
Arsenic was observed to exceedingly bioaccumulate and biomagnify in the
tissues. Perhaps due to the complex formation of arsenic and fluoride
the bio concentration of arsenic in tissues was observed to decrease
with increasing water fluoride concentration and vice-versa. The study
concludes that fluoride may interfere with the bio-concentration of
arsenic. 



10.22161/ijeab/2.2.53



http://ijeab.com/upload_document/issue_files/53%20IJEAB-APR-2017-30-Combined%20Toxicity%20and%20Bioconcentration%20of%20Fluoride%20and%20Arsenic%20in%20African.pdf



ijeab.com/submit-paper/

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