Abstract
Acute toxicity (96-hr LC50 and lethal concentrations) of water-borne metal mixtures viz. iron, zinc, lead, nickel and manganese was investigated in three fish species (Catla catla, Labeo rohita and Cirrhina mrigala ) under laboratory conditions at constant pH (7), total hardness (200 mgL-1 ) and water temperature (30°C). All the three fish species showed significantly variable tolerance limits in terms of 96-hr LC50 and lethal concentrations against 19 mixtures of five metals. Amongst 19 mixtures/treatments, the mixture of five metals (Fe+Zn+Pb+Ni+Mn) caused significantly higher toxicity to the fish in terms of 96-hr LC50 and lethal concentrations of 49.18±11.10 and 79.20±14.73 mgL-1 , respectively. However, Pb+Mn and Zn+Pb mixture was significantly least toxic to the fish with the mean LC50 and lethal concentrations of 85.42±10.50 and 134.86±30.46 mgL-1 , respectively. Regarding overall sensitivity of three fish species, Labeo rohita showed significantly least sensitivity to metal mixtures with a mean LC50 and lethal concentrations of 81.73±12.73 and 128.80±19.95 mgL-1 , respectively.

Saima Naz, Muhammad Javed. (2012) Acute toxicity of metals mixtures for fish, Catla catla, Labeo rohita and Cirrhina mrigala, , Volume-49, Issue-3.
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