Publikationsdatum:
2021-07-15
Beschreibung:
The effect of zinc exposure evaluated during a four day exposure periods at 13.88ppm, 26.75ppm, 53.5ppm,107ppm and 214ppm to Clarias gariepinus sub-adults showed the 96h LC50 as 26.62ppm. The threshold value was 20.30ppm. The muscle of the exposed fish analyzed showed a significant decrease in all the major cations and anions (Na+, CL-, Ca2+ K+, Mg2+) at (p〈0.05). The research revealed that there was no total inhibition of uptake of the cations and anions and also that uptake of these metals, that is cations and anions (Na+,-CL-, Ca2+ K+, Mg2+) increased rapidly during the 24 hours and dropped at 48 hours and 72 hours and gradually increased at the end of 96 hours showing that it was time dependent. During exposure period, affected fish stood in upright position with their snouts above the water surface, gasping for air. Observation of the exposed fish showed that they were peeling of skin, increase in opercula movement, erratic swimming, quietness and finally death. This research therefore recommends that zinc should be applied appropriately at 26.30ppm to avoid death of fish, man and other aquatic organisms that are the chief consumer.
Beschreibung:
Includes: 13 references.
Schlagwort(e):
Pollution
;
Fisheries
;
Clarias gariepinus
;
Nigeria
;
Ebonyi State
;
Ebonyi River
;
Zinc
;
Muscle
;
Cations
;
Anions
;
Clarias gariepinus
;
Zinc
;
Freshwater fish
;
Cations
;
Pollution effects
;
Trace metals
;
Bioaccumulation
;
Muscles
;
Pollutants
;
Anions
;
River fisheries
;
Lethal limits
Repository-Name:
AquaDocs
Materialart:
conference_item
,
TRUE
Format:
application/pdf
Format:
application/pdf
Format:
240-242
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