Haematological and biochemical parameters and tissue accumulations of cadmium in Oreochromis niloticus exposed to various concentrations of cadmium chloride
Al-Asgah, Nasser A. . 2015
Abstract Oreochromis niloticus, weighing 36.45± 1.12 g were exposed to 10%, 20% and 30% of
the LC50 of CdCl2 which represents treatments (T1)1.68, (T2)3.36 and (T3)5.03 mg/l, respectively,
for a period of 10, 20 and 30 days. It was found that, compared to a control group reading of
0.19 ± 0.03 lg/g dry weight, accumulation of Cd in the gills was significantly (p< 0.05) increased
in samples ranging between 7.64 ± 0.86 and 61.73 ± 0.82 lg/g dry weight from T1 at 10 days to T3
at 30 days. The accumulation of Cd in the liver, meanwhile, was also observed to significantly
increase (p<0.05) with increasing time and concentrations with results ranging between
3.21 ± 0.12 and 181.61± 1.32 compared to the control group results of 0.29 ±0.04 lg/g dry
weight. Although muscles exhibited lower levels of accumulation than the gills and liver they still
showed the same pattern of increase compared to the control group, with a significant difference
ranging between 0.32 ±0.02 and 2.16 ± 0.08 compared to the control group results of
0.03 ± 0.001 lg/g dry weight. Also, haematological parameters such as red blood cells (RBCs), haemoglobin
(Hb) and haematocrit (Hct) were reduced in fish exposed to Cd at all periods, with significant
differences (p< 0.05). Plasma glucose concentration showed a significant increase. Total
protein levels of fish showed a significant reduction (p> 0.05) for all exposed treatments. Also,
the total lipid level increased significantly as fish were exposed to increasing cadmium concentrations,
compared to control fish. Finally, the activities of aspartate aminotransferase (AST IU/l)
and alanine aminotransferase (ALT IU/l) showed a significant increase (p<0.05) with increasing
time and concentrations
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