Journal of Environmental Biology

Quinalphos induced alteration in respiratory rate and food consumption of freshwater fish Cyprinus carpio

K. Muttappa, H.R.V. Reddy, Mridula Rajesh* and A. Padmanabha

Department of Aquatic Environment Management, College of Fisheries, Mangalore - 575 002, India

*Corresponding Author E-mail: mridularajesh789@yahoo.co.in

Publication Data

Paper received:

08 May 2012

Revised received:

03 August 2013

Accepted:

05 October 2013

Abstract

Acute toxicity of commercial grade organophosphate insecticide, quinalphos (25% emulsified concentration) to common carp (Cyprinus carpio) was tested through bioassay. The acute toxicity of quinalphos to the fingerlings exposed for 96hr was found to be 2.75ppm. For sub lethal toxicity study, the fish were exposed to two concentration viz., 1/10^th of LC₅₀ (0.275 ppm) and 1/5^th of LC₅₀ (0.55 ppm) along with lethal concentration (2.75 ppm) as reference for 48 hr. The carps were under stress and mortality was insignificant in both sub lethal and lethal concentrations. However, considerable variation in respiration rate and food consumption rate was observed in both lethal and sublethal concentrations. The alteration observed in the physiological condition may be a consequence of impaired oxidative metabolism and elevated physiological stress by fish against quinalphos.

 Key words

Acute toxicity, Common carp, Food consumption, Quinalphos, Respiratory rate

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