study on hematological parameters and serum enzymes in common carp (cyprinus carpio ) after low cadmium concentration exposure

the 60 apparently common carp, cyprinus carpio (mean weight 700g.) divided to two groups (1:control and 2: test) and transferred to 1000 liter indoor fiberglass tanks supplied with static well water, continuous aeration and defined water quality. test group was exposed to 30ppb (low concentration) cadmium as cdcl 2 (merck) control group was without cadmium addition . blood samples were caught randomly from 5 fish in each group with duplicate, by using exsanguination of caudal vein at the day 15 and 30 after exposure. the hematological parameters such as: wbc , rbc, differential count, hematocrit - total protein , albumin , and globulin concentrations , the albumin- globulin ratio and levels of serum enzymes such as: ldh , alt , ast and alp were monitored. the results revealed that white blood cell (wbc: x 104 /µl) count decreased significantly (p< 0.05) from 3.98 ± 1.32 in group 1 (control , non-exposed to cadmium) to 2.52 ± 0.3 in group 2 (test , exposed to cadmium) on the 15th day post exposure. also , the wbc count significantly (p < 0.05)decreased in test group from 2.52 ± 0.3 on the 15th day post exposure to 1.7±0.33 on the 30th day post exposure. based on results the level of ldh enzyme (u/l) after 30 days exposure , in control group 430±69.35 significantly (p