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OJVRTM
Online Journal of
Veterinary Research©
(Including Medical and Laboratory Research)
Established 1994
ISSN 1328-925X
Volume 29 (9): 563-574, 2025.
Effect of sodium cyanide on freshwater
fish (Labeo rohita)
Praveen
N. Dube and Hosetti B.B
Toxicology division, Dept. of Applied
Zoology, Janasahyadri, Kuvempu
University, Shimoga, Karnataka, India
ABSTRACT
Dube PN, Hosetti
BB., Effect of sodium cyanide on freshwater fish (Labeo
rohita), Onl J Vet Res., 29
(9): 563-574, 2025. We report effect of 96h exposure to sodium cyanide on freshwater fish, Labeo rohita rendering
an LC50 of 0.32 mg/l. Water was maintained at 26±1 șC, pH 7.2±0.2 at 26șC,
dissolved oxygen 6.3±0.8 mg/l, total hardness 23.4±3.4 mg as CaCO3/l,
phosphate 0.39±0.002 μg/l, salinity 0.01ppm,
specific gravity 1.001 and conductivity less than 10 μS/cm,
renewed daily with 12-12 h photoperiod. Feeding was stopped 2 days prior to
exposure. We recorded 30% mortality at 30mg/l, 50% at 0.32 and 100% at 0.34mg/l
cyanide. Compared with untreated controls, in exposed fish, we observed changes
in skin colour, hyperactivity, loss of balance, rapid swimming, increased
surfacing, opercular activity and convulsions.
Keywords:
Labeo rohita,
toxicity, sodium cyanide, behavioural response.