Malays. Appl. Bioi. (December 2004) 33(2): 19-25
PLASMA CALCIUM AND INORGANIC PHOSPHATE LEVELS
OF A TELEOST HETEROPNEUSTES FOSSILIS
EXPOSED TO METACID-50
MISHRA, D., SRIVASTAV, S.K. and SRIVASTAV, A.K.*
Department of Zoology, D.D.U. Gorakhpur University,
Gorakhpur 273009, India E-mail: ajaisrivastav@hotmail. Com
ABSTRACT
Freshwater catfish, Heteropneustes fossilis were subjected to 5.28 mg/L (80% of 96 h LC50) and 1.32 mg/L (20% oi 96 h LC50) of Metacid-50 for short-term and long-term, respectively. The fish were sacrificed on 24, 48, 72 and 96 h in short-term experiment and 7, 14, 21 and 28 days in long-term experiment. The blood was collected on these intervals and plasma calcium and phosphate levels were determined. In short-term experiment, the plasma calcium levels oi Metacid-50 treated fish exhibit a decline after 24 h. This decrease continues till the close of the experiment (96 h). Up to 48 h following Metacid-50 exposure the plasma phosphate levels of the fish remain unaffected. From 72 h onwards, the levels decrease progressively. Chronically exposed fish to Metacid-50 exhibit a decrease in the plasma calcium levels at day 7. Thereafter, the levels progressively decrease till the end of the experiment (28 days). In Metacid-50 treated fish the plasma phosphate levels show a decrease on days 7 and 14. However, on days 21 and 28, the levels become almost close to the control level. This may be due to the redistribution of phosphate in the soft tissues, The results obtained in the present study may be applied to the field-collected samples and the levels of plasma calcium and plasma phosphate in the fish could be considered as biomarkers of the Metacid-50 contamination in the field.
ABSTRAK
Ikan keli air tawar, Heteropneustes fossilis, telah didedahkan kepada Metacid-50 pada tahap 5.28 mg/L (80% 9i jam LC50) dan 1.32 mg/L (20% 96 jam LC50) untuk jangka-masa pendek dan panjang masing-masing. Ikan dimatikan selepas 24, 48, 72 dan 96 jam dalam eksperimen jangka-masa pendek, dan 7, 14, 21 and 28 hari dalam eksperimer jangka-masa panjang. Sample darah diambil pada waktu-wkktu berkenaan dan tahap kalsium dan fosfat dalam plasma ditentukan. Dalam eksperimen jangka-masa pendek, aras kalsium dalam plasma ikan yang diberi Metacid-50 menunjukkan penurunan selepas 24 jam dan berlanjutan sehingga akhir eksperimen (96 jam). Selepas 72 jam aras menurun secara progresif. Ikan yang didedah secara kronik kepada Metacid-50 menunjukkan penurunan aras kalsium dalam plasma pada hari ke-7. Selepas itu, aras menurun secara progresif sehingga tamat eksperimen (28 hari). Ikan yang didedahkan kepada Metacid-50 menunjukkan penurunan aras fosfat pada hari ke-7 dan 14 tetapi pada hari ke-21 dan 28, aras tidak banyak berbeza daripada ikan kawalan. Ini mungkin disebabkan oleh agihan semula fosfal dalam tisu. Hasil kajian ini menunjukkan kemungkinan menggunakan aras kalsium dan fosfat dalam plasma ikar sebagai tanda untuk mengesan pencemaran oleh Metacid-50 dilapangan.
Key words: Plasma calcium, Plasma phosphate, Metacid-50, Fish, Organophosphate.
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