Haematological and Histological Changes in Tilapia (Oreochromis Mossambicus) Exposed to Cadmium and Chlorpyrifos
KrishiKosh
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Title |
Haematological and Histological Changes in Tilapia (Oreochromis Mossambicus) Exposed to Cadmium and Chlorpyrifos
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Creator |
Muttappa, Khavi
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Contributor |
Reddy, H.R.V
Reddy, Ravindra Kumar BASAVARAJU, Y Gangadhar Gowda Shrikrishna, Isloor Shridhar, N.B. |
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Subject |
Cadmium, Chlorpyrifos, Lethal toxicity, Oreochromis mossambicus, Haematology and Histology
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Description |
Ph.D. Thesis
The pollution of aquatic ecosystems with chemical contaminants has become one of the most critical environmental problem of the century. Heavy metals, pesticides and many other organic chemicals, are the harmful group of pollutants in aquatic habitat, almost crossed the level of acceptable limit, causing acute and chronic toxicity to fish fauna. One of the early symptoms of acute heavy metal and pesticide poisoning is the alteration in the haematological profile and morphological changes in different organs like gill, liver and kidney. A bioassay was conducted to determine the lethal toxicity (LC50) of heavy metal, Cadmium and commercial grade Organophosphate insecticide, Chlorpyrifos (20% EC) on Tilapia (Oreochromis mossambicus). The lethal toxicity (LC50) of Cadmium, Chlorpyrifos, Cadmium + Chlorpyrifos and Chlorpyrifos + Cadmium were found to be 169.80ppm, 0.022ppm, 92.04ppm and 0.016ppm, respectively. The lethal toxicity result reveaed that, Cadmium and Chlorpyrifos are more toxic to fish in combinations compared to their individual exposures. For sublethal toxicity study, the fishes were exposed to two sublethal concentrations (i.e 1/5th of LC50 and 1/10th of LC50) for up to 21days. In the present study, significant decrease in RBC count, haemoglobin content and haematocrit value, erythrocyte indices and increase in WBC count with severe morphological changes in the gills, liver and kidney were observed in fishes treated with two sublethal concentrations of Cadmium, Chlorpyrifos and mixture of Cadmium and Chlorpyrifos. It was concluded that mixture of Cadmium + Chlorpyrifos cause severe alterations in haematological parameters compared to its individual exposure. The nature of damage caused by pesticide and heavy metal was different in different organs of the fish. At sublethal 129 levels, the Chlorpyrifos caused more damage to the gills while liver was most affected in the presence of Cadmium. On the other hand, a combination of Cadmium + Chlorpyrifos caused more damage to the kidney. |
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Date |
2016-06-25T12:15:06Z
2016-06-25T12:15:06Z 2015-05-10 |
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Type |
Thesis
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Identifier |
http://krishikosh.egranth.ac.in/handle/1/68020
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Language |
en
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Format |
application/pdf
application/pdf |
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Publisher |
Karnataka Veterinary, Animal and Fisheries Sciences University, Bidar
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