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OJVRTM

Online Journal of Veterinary Research©

(Including Medical and Laboratory Research)

Established 1994

ISSN 1328-925X

 

Volume  29 (11): 704-712, 2025.

 Sublethal toxicity of quinalphos to Cyprinus carpio fish

 

Chebbi SG, David M

 

Karnatak University’s Research Laboratory, Toxicology and Molecular Division, Department of Zoology, Karnatak Science College, Dharwad, Karnataka, India

 

Abstract

 

Chebbi SG, David M, Sublethal toxicity of quinalphos to Cyprinus carpio fish. Onl J Vet Res 29 (11): 704-712, 2025. We report toxicity of quinalphos on Cyprinus carpio fish. Carp fingerlings were exposed to 6.64 - 7.88 µl/l quinalphos for 96h yielding acute toxicity with 7.5 µl/l.  We then applied 1/5 and 1/10 LC50 (7.5 µl/L) to determine behavior and oxygen consumption were under lethal 1 to 4 d and sub lethal effects for 1 to 15 days. Fish in at toxic levels exhibited irregular, erratic, and darting swimming movements, hyper excitability, loss of equilibrium, sinking and altered respiration. Caudal bending was observed. We  surmise behavioural and morphological changes might be due to inhibition of acetylcholinesterase (AChE) activity. However, even though carp appeared stressed, mortality did not occurr with sublethal quinalphos.

 

Keywords: Quinalphos; Common carp; Behavioral toxicity; Respiratory distress.

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