All submissions of the EM system will be redirected to Online Manuscript Submission System. Authors are requested to submit articles directly to Online Manuscript Submission System of respective journal.

Abstract

Factors Affecting Acute Toxicity Dose of Lead Nitrate in Certain Indian Air-Breathing Fishes

Author(s): Pandit DN, Kumari R and Kumari V

The present work was conducted to determine an ideal median lethal concentration of lead nitrate in two air-breathing fishes namely Channa punctatus (Bloch) and Clarias batrachus (Linn.) using following methods and also influence of different factors to get at a logical conclusion. (1) Graphical method: The LC50 value was 12.02 and 165.0 mg/L for Channa punctatus while 350.0 and 380.0 mg/L for Clarias batrachus. (2) Probit Graphical method: The LC50 value was 11.48 and 177.8 mg/L for Channa punctatus while 315.0 and 346.7 mg/L for Clarias batrachus. (3) Regression method of Finney (1971): From this method LC50 value was calculated to be 11.75 and 208.0 mg/L for Channa punctatus while 320.0 and 348.0 mg/L for Clarias batrachus. (4) Behrens and Karber method: By this method, 96 h-LC50 was found 12.75 and 167.5 mg/L for Channa punctatus while 375.0 and 425.0 mg/L for Clarias batrachus. From these values, the average median lethal concentration of 96 h-LC50 value was calculated to be 12.0 mg/L for Channa punctatus (body weight: 50-68 g) and 180.0 mg/L for Channa punctatus (body weight: 55-75 g). Similarly, 340.0 mg/L for Clarias batrachus (body weight: 85-110 g) and 375 mg/L for Clarias batrachus (body weight: 125-150 g). In this paper, factors such as intra-specific variation, physico-chemical features, spatial variation and methodological variation affecting the values of LC50 has also been studied.


Share this       
izmir escort izmir escort bursa escort antalya escort izmir escort porno porno izle türk porno eskişehir escort bartın escort burdur escort havalandırma izmir escort bursa escort porno indir izle escort izmir