ABSTRACT
The acute toxicity of cypermethrin to juvenile
catfish (Clarias gariepinus) was investigated with emphasis on the
histopathological effects. Clarias gariepinus was exposed to 0,20,40,60,80 and
looppm of cypermethrin, the lethal concentration was 50.l2ppm ith lower and
upper limit 0.6688 and 2.542.The threshold value was 9.977ppm for 96h of
exposure. The dilution of the solution was made as follows: one gram of the
pollutant was vigorously stirred in 1 litre of borehole water in a glass flask
using a glass rod. This dispersion became the mother solution. Then lml of this
stock solution was introduced into 9m1 of bore hole water (10 times d11uti6n)
and after stirring, lml of diluted solution was removed and introduced into
99m1s of bole hole water (100 times dilution) again, imi was extracted from
this and introduced into 999m1s of bole-hole water (1,000, 000 times dilution).
This third dilution was the stock test medium (stm) from which the different
experimental treatment was obtained. The concentrations used were 0, 20, 40,
60, 80, andloOppm respectively. Cypmethrin concentration corresponding to the
96h LC5O value for juvenile C. gariepinus was in inducing histopathological
changes of gill, liver and intestine. There were fatty infiltration of the
liver cell, massive fatty infiltration of liver cell observed in lOOppm
concentration, necrosis and cellular infiltration of the intestinal epithelium
and mild cellular Infiltration of the gills. These changes occurred
predominantly in the 96h exposure respiratory stress erratic swimming and
instant deaths of fish were observed in exposed fish, which varies with the
concentration of the toxicant and its showed that the mortality increase with
increases in concentration. The samples of dead fish were collected and fixed
in formaldehyde to preserve them in a life-like manner. The tissues were later
processed for histopathological examination. The result of this study revealed
that cypermenthrin is toxic to fish.
IWUOGARANYA, A (2021). Histopathological Studies On The Effect Of Cypermethrin On Juvenile Clarias Gariepinus . Mouau.afribary.org: Retrieved Nov 14, 2024, from https://repository.mouau.edu.ng/work/view/histopathological-studies-on-the-effect-of-cypermethrin-on-juvenile-clarias-gariepinus-7-2
AMARACHI, IWUOGARANYA. "Histopathological Studies On The Effect Of Cypermethrin On Juvenile Clarias Gariepinus " Mouau.afribary.org. Mouau.afribary.org, 04 Aug. 2021, https://repository.mouau.edu.ng/work/view/histopathological-studies-on-the-effect-of-cypermethrin-on-juvenile-clarias-gariepinus-7-2. Accessed 14 Nov. 2024.
AMARACHI, IWUOGARANYA. "Histopathological Studies On The Effect Of Cypermethrin On Juvenile Clarias Gariepinus ". Mouau.afribary.org, Mouau.afribary.org, 04 Aug. 2021. Web. 14 Nov. 2024. < https://repository.mouau.edu.ng/work/view/histopathological-studies-on-the-effect-of-cypermethrin-on-juvenile-clarias-gariepinus-7-2 >.
AMARACHI, IWUOGARANYA. "Histopathological Studies On The Effect Of Cypermethrin On Juvenile Clarias Gariepinus " Mouau.afribary.org (2021). Accessed 14 Nov. 2024. https://repository.mouau.edu.ng/work/view/histopathological-studies-on-the-effect-of-cypermethrin-on-juvenile-clarias-gariepinus-7-2