Acute toxicity of brewery effluent on <i>Chironomus travalensis</i> (Dipteran larvae)

Abstract

The acute toxicity of brewery effluent to Chironomus travalensis was determined in 96-hr static bioassay under laboratory conditions. The test was conducted in replicates of between 10% and 50% effluent concentrations. Mortality of the test organism increased with the increase in the various concentrations. C. travalensis 96 h-LC₅₀ was 30% (with confidence interval of 22.09 to 87.91 and slope value of 1.25), which was most toxic, while 24 h-LC₅₀ of 46% was the least toxic to the test organism. Median lethal time, LT50 for 30% effluent concentration was 95 hours. Mortality varies with the concentrations.


Key Words: Toxicity, Effluent, Dipteran larvae and Benthos


Journal of Aquatic Sciences Vol.19(1) 2004: 23-26