Dimethoate Induced Changes in Serum Ca2+ and Corpuscles of Stannius in Freshwater Catfish Heteropneustes fossilis, after Short-Term and Long-Term Exposure
The Corpuscles of Stannius (CS) exclusively present in bony fishes, produce Stanniocalcin – an anti-hypercalcemic hormone. Fish are in intimate contact with their surrounding through their gills. Gills are the main target of stanniocalcin; therefore, the activity of CS is influenced by many external and internal factors. Stressful conditions such as exposure to various pesticides disturb the ionic balance in fishes. Short-term (96 h) and long-term (36 d) toxic effect of an organophosphate insecticide, dimethoate was studied on serum Ca2+ and CS histology in freshwater air-breathing catfish Heteropneustes fossilis. The concentration of dimethoate for short-term exposure was 2.24 mg L-1 (75% of 96 h LC50) and for long-term was 0.75 mg L-1 (25% of 96 h LC50). Fish exhibited hypocalcaemia in both the short-term as well as in long-term experiment. The glandular cells of CS in short-term experiment, exhibited increase in the nuclear volume (NV) along with increase in the nucleoli number after 24 h and thereafter, show decrease in NV and deformity of nucleus after 96 h dimethoate exposure. In long-term experiment, the NV increased following 6 d of exposure to dimethoate, but decreased significantly thereafter. The gland exhibited degeneration after 36 d of dimethoate exposure.
Rakesh Kumar Pandey,
Vijai Krishna Das,
Dimethoate Induced Changes in Serum Ca2+ and Corpuscles of Stannius in Freshwater Catfish Heteropneustes fossilis, after Short-Term and Long-Term Exposure, American Journal of Life Sciences.
Vol. 3, No. 1,
2015, pp. 17-21.
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