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OJVRTM
Online Journal of Veterinary
Research©
Volume 13 (1):12-19,
2009. Editors
Redaction 2017.
Behavioral and respiratory responses of freshwater fish, Cyprinus carpio (Linnaeus) to quinalphos intoxication
in sub-lethal tenure.
Chebbi SG, David M*
Karnatak University’s Research Laboratory, Toxicology and Molecular
Division, Department of Zoology, Karnatak Science
College, Dharwad-580 001, Karnataka, India
Abstract
Chebbi SG, David M, Behavioral
and Respiratory Responses of the Freshwater
Fish, Cyprinus carpio (Linnaeus) Under Quinalphos
Intoxication in Sublethal Tenures. Onl J Vet Res 13 (1):12-19, 2009. A short term definitive test by static renewal bioassay
method was conducted to determine acute toxicity (LC50) of the
organophosphate insecticide, quinalphos (25% EC) on freshwater Cyprinus carpio (Linnaeus). Carp fingerlings were exposed to 6.64 - 7.88 µl/l
quinalphos for 96h. Acute toxicity was 7.5 µl/l and 1/5th and 1/10th LC50
7.5 µl/L was selected for subacute studies. Behavioural
patterns and oxygen consumption were determined under lethal toxicity at days
1, 2, 3 and 4 and sub lethal concentrations at 1, 5, 10 and 15 d. One fifth, 1.5
µl/l and 1/10th, 0.75 µl/l acute toxicity were used as sublethal concentrations for subchronic
studies. Fish were exposed to sublethal
concentrations for 1, 5, 10 and 15 days and behavioral responses and
respiratory rate were studied in experimental tenures. Fish in toxic media exhibited irregular, erratic, and darting swimming movements, hyper excitability,
and loss of equilibrium and sinking. Caudal bending was the chief
morphological alterations during exposure tenures. The behavioral and
morphological changes might be due to inhibition of acetylcholinesterase (AChE) activity. Inactivation of AChE
results in excess accumulation of acetylcholine in cholinergic synapses leading
to hyperstimulation and cessation of neuronal
transmission (paralysis). The carp were found under stress but mortality was
insignificant in both sublethal concentrations. Considerable variation in
respiratory rate was observed in both one fifth and one tenth sublethal concentrations of quinalphos respectively. An
alteration in respiratory rates is due to the respiratory distress. This may be
a consequence of impaired oxidative metabolism and elevated physiological
response by the fish against quinalphos stress. The impairments in fish respiratory physiology and behavioural response even under recovery tenures may be due to slow release of sequestered quinalphos
from storage tissues.
Keywords: Quinalphos; Common carp; Behavioral toxicity; Respiratory
distress.
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