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Radhakrishnaiah, K.
- Evaluation of Nickel Toxicity in Freshwater Snail, Pila globosa (Swainson) in Relation to Body Size
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1 Department of Zoology, Sri Krishnadevaraya University, Anantapur-515 055, A.P., IN
1 Department of Zoology, Sri Krishnadevaraya University, Anantapur-515 055, A.P., IN
Source
Nature Environment and Pollution Technology, Vol 10, No 2 (2011), Pagination: 229-232Abstract
Small (20±2 g) and large (40±2 g) size groups of the freshwater snail Pila globosa were exposed to different concentrations of nickel (mg/L), and 96 hr LC50 through percent and probit mortality of the animals and also by Dragstead and Behren's method were determined. There was a linear relationship between the percent or probit mortality and the nickel concentration of both the size groups of snails. Thus, the percent and/or probit mortality increased with the increase in concentration of nickel. The percent mortality plotted against log concentration of nickel gave sigmoid curves, whereas the probit mortality plotted against log concentration gave straight lines in both the groups of snails. The 96 hr LC50 obtained for small and large size groups of snails are 117.6 mg/L and 206.3 mg/L respectively. These values obviously indicated a significant (P<0.001) increase in the LC50 of nickel with the increase in the size of the snail. The results of the present study indicate that the small size groups of snails are more sensitive to nickel than the large size groups.Keywords
Pila globosa, Toxicity Evaluation, Nickel Toxicity, 96 hr LC50.- Effect of Cadmium on the Histology of Hepatopancreas and Foot of the Freshwater Mussel Lamellidens marginalis (LAM)
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Authors
Affiliations
1 Department of Zoology, Sri Krishnadevaraya University, Anantapur-515 003, A.P., IN
1 Department of Zoology, Sri Krishnadevaraya University, Anantapur-515 003, A.P., IN
Source
Nature Environment and Pollution Technology, Vol 7, No 3 (2008), Pagination: 397-402Abstract
Histopathological studies would help in evaluating the extent of damage caused to the tissues under stress. Hence, in the present study an attempt has been made to observe the structural changes in the hepatopancreas and foot of the mussel Lamellidens marginalis exposed to acute (11.0mg/L) and subacute (1.10mg/L) concentrations of cadmium. The changes are observed at day 1 and day 3 in acute concentration and day 10 and 30 in subacute concentration, one at short- term and the other at long-term exposure. In hepatopancreas enlargement of intertubular area, cell necrosis and the formation of sinuses and in foot loss of connective tissue, vacuolization, disarrayed fibres and nuclear pyknosis were seen on exposure to acute concentration of cadmium at day 1. Similar changes with mild degree of recovery were observed at day 3. In subacute concentration some degenerative changes like mild tubular atrophy and cell necrosis in hepatopancreas and fibrillation, intermuscular oedema and pyknotic nuclei in foot of mussel were observed at day 10, however, at day 30 the tissues appeared more or less similar to those of controls with insignificant changes.Keywords
Heavy metals, Cadmium Toxicity, Lamellidens marginalis, Hepatopancreas, Histology, Degenerative changes, Cell Necrosis, nuclear pyknosis, Fibrillation.- Effect of Subacute Concentration of Cadmium on the Energetics of Freshwater Mussel Lamellidens marginalis (LAM.)and Fish Labeo rohita (HAM.)
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Authors
Affiliations
1 Department of Zoology, Sri Krishnadevaraya University, Anantapur-515 003, A.P, IN
1 Department of Zoology, Sri Krishnadevaraya University, Anantapur-515 003, A.P, IN