Assessment of acute toxicity of aluminum to the four freshwater fish species (Labeo rohita,Cirrhina mrigala,Catla catla and Ctenopharyngodon idella)

The acute toxicity,in terms of 96-hr lc50and lethal concentration,of aluminum (al) regarding four fish species viz. labeo rohita,cirrhina mrigala,catla catla and ctenopharyngodon idella of 90-,120-and 150-day age groups was determined under the wet laboratory under static bioassay. all the tests were performed,separately,at constant water temperature (30°c),ph (7.5) and hardness (300mgl-1). all fish species showed significantly (p<0.05) variable sensitivity to different concentrations of aluminum. however,labeo rohita of all the three age groups showed significantly least sensitivity,in-terms of 96-hr lc50 and lethal concentration,against aluminum. for the age groups,90-day fish showed significantly higher sensitivity,followed by that of 120-and 150-day old fish groups. among fish species,ctenopharyngodon idella exhibited significantly (p<0.05) higher sensitivity to aluminum with the mean 96-hr lc50 and lethal concentrations of 56.91±22.17 and 85.66±23.33mgl-1,respectively while labeo rohita were significantly least sensitive with the mean 96-hr lc50 and lethal concentrations of 75.50±21.09 and 118.71±23.00mgl-1,respectively. physico-chemical variables viz.,dissolved oxygen showed highly significant and inverse relationship with aluminum concentration while ammonia had highly significant but positive impact on aluminum concentration of the test media. © 2016,university of agriculture. all rights reserved.