Journal of Environment and Sociobiology

Hemlata Verma ¹, Neera Srivastava ¹

Affiliations
1 Fish Biology Laboratory, Centre for Advanced Studies, Department of Zoology, University of Rajasthan, Jaipur-302004, IN

Abstract

Biochemical response has been evaluated in the ovary of Channa punctatus (Bloch) after 135-day exposure to sub-lethal concentrations (0.1 and 0.2 mg/1) of zinc. Changes in glycogen, cholesterol, total proteins and total lipids were estimated. All these parameters showed significant depletion. Results are directly proportional to dose and duration of the experiment. Results indicate that exposure to zinc for prolonged periods may also reduce fecundity of fish, thereby limiting the numerical size of the succeeding generations.

Keywords

Channa punctatus, Zinc, Ovary, Biochemistry.

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Garima Harit ¹, Neera Srivastava ¹

Affiliations
1 Department of Zoology, Centre for Advanced Studies, University of Rajasthan, Jaipur-302 004, IN

Abstract

Present study has been undertaken to investigate alterations in some haematological parameters along with endosulfan accumulation in blood of Channa punctatus after sub-chronic exposure to endosulfan. A statistically significant decline is observed in RBC, Hct, Hb and MCHC content in all the treated groups, reflecting an anaemic condition of the fish. Results indicate significant elevation in WBC, MCV, MCH, blood glucose and endosulfan content in blood, indicating a stress condition. Post exposure recovery was noted on depuration for another fortnight. Mild recovery was noted in haematological parameters and blood glucose along with slow elimination of endosulfan.

Keywords

Accumulation, Haematology, Channa punctatus, Endosulfan, Recovery.

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Garima Harit ¹, Neera Srivastava ¹

Affiliations
1 Department of Zoology, Centre for Advanced Studies, University of Rajasthan, Jaipur-302 004, IN

Abstract

After exposure of Channa punctatus to sub-lethal concentrations of endosulfan for 120 hrs, residues of endosulfan were estimated quantitatively in muscle, gills and blood. Maximum accumulation of endosulfan was observed in the gills. Treated fishes were subsequently transferred to endosulfan free freshwater for another 120 hrs in order to study the recovery response of these fishes. During recovery phase, slow and steady elimination of endosulfan residue was observed in both treated groups, showing non-significant removal in muscle and highly significant removal in gills and blood. Results reveal that muscle, gills and blood of C. punctatus have the ability to bioaccumulate endosulfan even at low concentrations and short exposure. This may in turn lead to various degenerative processes which will influence physiology and nutritive value of the fish.

Keywords

Bioaccumulation, Endosulfan, Recovery, Channa punctatus.

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Hemlata Verma ¹, Neera Srivastava ¹

Affiliations
1 Fish Biology Laboratory, Center for Advanced Studies, Department of Zoology, University of Rajasthan, Jaipur - 302004, IN

Abstract

Indiscriminate use of heavy metals has elevated the risk of contamination of the aquatic habitat. Present study has, therefore, been undertaken to investigate the alterations in bioaccumulation and histopathology of the liver in a freshwater teleost Channa punctatus. On exposure to three sublethal concentrations of zinc (10 mg/l, 15 mg/l and 25 mg/l) for 15 days, statistically significant increase in zinc concentration was noted in the liver of all treated groups. Simultaneously severe histopathological changes were also noted in the liver. Both bioaccumulation and histopathological changes were dose and duration dependent.

Keywords

Zinc, Channa punctatus, Bioaccumulation, Histopathology.

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Neera Srivastava ¹, Anupama Tyagi ¹

Affiliations
1 Fish Biology Laboratory, Department of Zoology, University of Rajasthan, Jaipur (Rajasthan), IN

Abstract

In the present investigation, bioaccumulation of zinc was estimated in the gills and intestine of Channa pundaliis after 135 day exposure to such levels of zinc (0.lmg/l and 0.2mg/l) which are normally found in natural water bodies around Jaipur. Significant increase in concentration of zinc was noted in the tissues both of the above organs. This increase was dose and duration dependent.

Keywords

Bioaccumulation, Zinc, Gills, Intestine.

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