ࡱ> q` bjbjqPqP 1::ALLLLLLL`(q(q(q(q$Ls`vwwwwxxx$Bh`-LxxxxxLLwwFxjLwLwxVsLL[wv *"h(q2 / \0T ~ [[ Lkxxx xxxxxxx```dDk```Dk```LLLLLL EFFECT OF EDTA ON REDUCTION OF CADMIUM TOXICITY ON GROWTH , SOME HAEMATOLOGICAL AND BIOCHEMICAL PROFILES Of NILE TILAPIA (Oreochromis niloticus). Adel M. E. Shalaby Fish Physiology Department, Central Laboratory for Aquaculture Research, Abbassa, Abo- Hammad, Sharkia, Egypt. ABSTRACT The effect of the ion exchanging (chelating) agent EDTA on cadmium (Cd) toxicity and the impact on fish growth, food utilization, haematological and biochemical changes in Nile tilapia (Oreochromius niloticus) were studied. The fish (35-40g )were exposed to 10 ppm Cd alone or with 0.1, 0.2 and 0.3 g EDTA/L for 15 and 45 days. Cd exposure significantly (P<0.05) reduced the fish growth and feed utilization; however, these parameters were improved when EDTA was applied along with Cd. Cd exposure reduced significantly (P<0.05) such as erythrocyte count (RBCs), haemoglobin content (Hb), haematocrit value (Hct), mean cell haemoglobin (MCH) and mean cell haemoglobin concentration. These parameters were improved when EDTA was applied with Cd. The values of RBCs , Hb, Hct, MCH and MCHC were increased significantly to be as in the control fish group. These were significant decreases in alkaline phosphatase activity and total protein (TP) in plasma, muscle and liver in fish exposed to Cd alone. The plasma glucose concentration, total lipids (LP), aspartate aminotranseferase (AST), alanine aminotransferase (ALT) and acid phosphatase ( ACP) were increased significantly in fish exposed to Cd alone. Addition of EDTA to Cd contaminated medium enhanced biochemical parameters in fish and the enzyme activities returned to be as the control fish group. Addition of EDTA to Cd contaminated medium considerably reduced metal absorption and accumulation in fish tissues, while it was increased metals in water and feces. Fish exposed to Cd alone accumulates 2.16 and 5.972 mg Cd/g dry weight in liver tissue for 15 and 45 days respectively. Cd reduced significantly to 1.292 and 4.16.; 0.94 and 3.79; and 0.42 and 2.45 mg Cd/g dry weight tissue in fishes exposed to 0.1, 0.2 and 0.3g EDTA/L 15 and 45 days, respectively. Similar trends were observed in gills and muscle. Key words:, Nile tilapia, cadmium, EDTA, growth performance, feed utilization, haematology, Biochemistery, glucose, TP, LP, AST, ALT, ALP and ACP. INTRODUCTION The problem of appearance of toxic materials in water ecosystem is presently closely connected with increased concentration of different types of pollutants, which enter water bodies with industrial and communal waste waters or from non point sources. Metals are redistributed naturally in the environment by both geologic and biologic cycles. Many metals, whether organically-complexed or not are known to accumulate in plant and animal tissues to very high level, posing a potential toxic hazard to the organisms themselves, or organisms higher in the food chain including humans, which may consume them (Abel 1998). Evidence of toxic effect of heavy metals has been reported on fishes and populations eating contaminated food (Chang 1996) Cadmium is an extremely toxic heavy metal which is widely used in mining, metallurgical operation, electroplating industries manufacturing vinyl plastics, electrical contacts, metallic and plastic pipes. Effluents from such plants are sources of cadmium into aquatic environments. Most aquatic organisms have the capability of concentrating metals by feeding and metabolic processes, which can lead to accumulation of high concentrations of metals in their tissues. .Metals interact with legends in proteins particularlty, enzymes and may inhibit their biochemical and physiological activities (Passow et al.,1961) The reduction of toxic elements like cadmium in aquatic environments is needed by any acceptable method. The most widely used technique for the removal of toxic elements involves the process of neutralization and metal hydroxide precipitation (Hiemesh and Mahadevaswamy, 1994). Chemicals can effectively remove certain toxic elements from industrial wastes or polluted media, but is usually costly. However, there are some cheap chemicals which are also free from undesirable side effects. In recent years , the remobilization of metals by synthetic anthropogenic chealting agents has received much attention. The literature reported number of chelators that have been used for chelate-induced hyperaccumulation (Huang et al.1997). Synthetic compound like ethylenediamine tetraacetic acid (EDTA) is known to be effective chelating agents of heavy metals (Licop 1988). EDTA is the most commonly used chelator because of its strong chelating ability for different heavy metals (Norvell, 1991). EDTA has two advantages with respect to other its relative low biodegradability in groundwater systems (Nowack, 1996) and its strong complexing capacity with heavy metals (Kedziorek and Bourg, 2000). Metal bioaccumulation can occur via complexation, coordination, chelation, ion exchange and other processes of greater or lesser specificity. Bioaccumulation processes are sometimes due to active (metabolism dependent) metal accumulation by living cells. In other cases, bioaccumulation is a strictly aggressive process in which metal ions are sequestered by metal binding site in the interior of the cell. In the removal of toxic elements from contaminated water, has potential advantages over the conventional treatment process (ion exchange, precipitation, membranes, etc.) Kuyack & Volesky (1990). In spit of the amount of data published on the effect of waterborne exposure of cadmium and EDTA singly, information on the effects of Cd / EDTA mixture on aquatic organisms are limited and not uniform. Therefore, EDTA appears to be promising tool to control cadmium pollution in aquaculture. The present study, short and long term bioassays were designed to evaluate the influence of EDTA on the retention of cadmium in water. It was carried out to investigate the effect of EDTA on reduction of toxicity of cadmium for enhance the change of blood parameter and enzymes and to assess its impact on some physiological parameters of Nile tilapia (Oreochromis. Niloticus). MATERIALS AND METHODS Fish Culture Management: Healthy fish of Nile tilapia Oreochromis niloticus weighing 35- 40 g/ fish were collected from the ponds of Central Laboratory for Aquaculture Research at Abbassa, Abo-Hammad, Sharkia, Egypt. Fish were acclimated in an indoor tank for 2 weeks to laboratory conditions. Acclimated fish were exposed to different concentration of cadmium and mortality were observed for 96- h. A static renewable bioassay method (Spraggue 1973) was adopted for the determination of 96-h median lethal probity analysis (Litchfield and Wileoxon 1949) was followed the calculation of 96 hr LC50. A control group was maintained in metal free tap water. The 96 hr LC50 of cadmium for Oreochromius niloticus was 40 ppm. A stock solution of cadmium was prepared by dissolving 10.686 g 0f analar grad cadmium sulphate (CdSO4 8/3H2O ) in 1/L of distilled water and the diluted with water to obtain the desired concentration (10 ppm) for this experiment. The fish were distributed randomly in 120-liter glass aquaria, at a rate of 15 fish / aquarium that containing aerated tap water. These aquaria were divided into five groups with three replicates each per group. The first group was free of Cd and EDTA and maintained as a control. The second groups were exposed to 10 ppm of Cd SO4 only. (Equivalent to 1/4 96 h LC50). The third, fourth and fifth group were exposed to 10 mg Cd /L and 0.1, 0.2 and 0.3 g EDTA/L, respectively. Each aquarium was supplied with compressed air via air-stones from air pumps. Well-aerated water supply was provided from a storage fiberglass tank. The temperature was adjusted at 271 oC by means of thermostats. Cadmium sulphate and EDTA was obtained from El- Nasr chemical company (Egypt) and prepared in aquatic solution to provide the required concentrations of cadmium and EDTA. Table (1): Experimental groups and their notation. S. No.GroupsNation1Control (metal free water)C2Cadmium (10 ppm) aloneCd3Cadmium (10 ppm) +0.1g EDTA/lCdEDTA14Cadmium (10 ppm) +0.2 EDTA/lCdEDTA25Cadmium (10 ppm) +0.3g EDTA/lCdEDTA3 Fish were fed frequently a diet containing 30% crude protein (CP) at a rate of 3% of live body weight twice daily for 15 and 45 days. Siphoning three quarters aquariums was done every day for waste removal and replacing it by an equal volume of water containing the same concentration of Cd and EDTA. Dead fish were removed and recorded daily. Growth parameters Growth performance was determined was calculated as following: Weight gain = W2 W1 ; Specific growth rate (SGR) = 100 (lnW2 lnW1) / T; where W1 and W2 are the initial and final fish weight, respectively, and T is the number of days in the feeding period; Feed conversion ratio (FCR) = feed intake / weight gain Physiological Analyses: After 15 and 45 days of the experiment. Samples of blood, liver, gills and muscle were taken from three Nile tilapia from each aquarium. Fish were not fed for 24 h before sampling and were anaesthetized with buffered MS222 (50 mg /L) and blood samples were taken from caudal vein of an anaesthetized fish by sterile syringe using EDTA solution as anticoagulant. These blood samples were used for determining erythrocyte count (Dacie and Lewis 1984) and hemoglobin content (Van Kampen, 1961). Heamatocrit value (Hct) were calculated according to the formulae mentioned by Britton (1963). Plasma was obtained by centrifugation of blood at 3000 rpm for 15 min and nonhaemolyzed plasma was stored in deep freezer for further biochemical analyses. After decapitation of fish, samples of liver and muscle were taken and frozen for further biochemical analyses. Plasma glucose was determined, using glucose kits supplied by Boehring Mannheium kit, according to Trinder (1969). Total protein content was determined colorimetrically according to Henry (1964). Total lipids contents were determined colorimetrically according to Joseph et al. (1972). Activities of aspartate amninotransferase (AST) and alanine aminotransferase (ALT) were determined colorimetrically according to Reitman and Frankel (1957), while alkaline phosphatase (ALP) was measured by using Diamond diagnostics kits according to the method of Rec (1972). Also acid phosphatase (ACP) activity was determined according to the method of King and King (1954) Cd residue : Cadmium was measured in water, liver ,gills, muscle and feces according to method of Eaton and Stinson, 1983). Statistical Analysis: The obtained data were subjected to analysis of variance according to Snedecor and Cochran (1982). Differences between means were done at the 5% probability level, using Duncan s new multiple range test (Duncan, 1955). RESULTS The present study showed that the addition of EDTA to Cd contaminated media, reduced significantly the Cd level in water and helped to eliminate Cd from the fish body , which in turn improved the growth, haematological and biochemical parameters as compared to fish exposed to cadmium alone. Growth perforamance: The results of final weight, weight gain (WG), specific growth rate (SGR), feed intake and feed conversion ratio (FCR) obtained in fish exposed to sublethal of Cd alone with and without of EDTA are given in Table 2 . Results in Table 2 showed that the final weight, GW, SGR, feed intake and FCR were decreased significantly (P<0.05) when Nile Tilapia exposed to Cd alone, while fish growth was increased significantly (P0.05) when fish exposed to Cd with 0.2 and 0.3 g EDTA/L when compared to Cd alone and similar to the control fish group. Haematological parameters: The results of erythrocyte count (RBCs), haemoglobin content (Hb) and haemetocrit value ( Hct) obtained from the fish exposed to sublethal dose of Cd (10 mg/l) alone or with different doses of EDTA are given in Table (3). Table 3 shows that the RBCs, HB and HCt were reduce in fish exposed to Cd at both periods and they were less than that of the control (P<0.05) The RBCs count decreased significantly in fish exposed to Cd at 15 and 45 days. On the other hand, these parameters were return to the normal values and increased significantly in fish exposed to Cd with 0.2 and 0.3 g of EDTA/l for 15 and 45 days. These values increased significantly in fish exposed to Cd with 0.3 g EDTA/l. Blood parameter were improved in fish exposed to Cd with different levels of EDTA. The blood indices calculated from the mean values of blood parameters for the aforementional treatments are given in Table 4. Data shows that the MCV increased significantly in fish exposed to Cd alone, while the MCH and MCHC decreased significantly in fish exposed to Cd only when compared with the control. These parameters increased with increasing of exposure time of fish to Cd. Addition of EDTA to Cd- polluted media maintained the MCV, MCH and MCHC at levels close to those of the control. Biochemical parameters: The present study show that addition of EDTA to Cd contaminated media, reduced significantly the Cd level in the water and helped to eliminate metal from the fish body and in turn improved the biochemical parameters as compared to fish exposed to Cd alone The plasma glucose concentration showed higher significant values (P< 0.01) (94.86 6.14 and 68.77 1.43 mg %) in fish exposed to Cd alone and Cd with 0.1 g of EDTA/l for 15 days than the control fish group value (60.15 2.89 mg %). The glucose concentration in fish subjected for other groups (Cd+0.2 g EDTA/l and Cd with 0.3 g EDTA/L) did not significantly be affected. After 45 day of exposure, the plasma glucose concentration were significantly increased (P <0.05) in all treatments. As seen in Table (5) there was no significant variation in the plasma total protein of nearly all fish under investigation for 15 days. After 45 days the plasma total protein decreased significantly to be 1.536 0.073, 1.806 0.098 and 1.84 0.158 g/100ml in fish exposed to Cd alone and mixture of Cd + 0.1 g EDTA/L and Cd + 0.2 g EDTA/L respectively. This value increased significantly after exposing fish to mixture of Cd with 0.3 g EDTA/L. The plasma total lipids increased significantly in fish exposed to Cd alone and Cd with 0.1 g EDTA/L for 15 and 45 days when compared to the control group, while it was similar to the control group in fish exposed to mixture of Cd with 0.2 g and 0.3 g EDTA/L for 45 days. Table 6 shows a significant reduction in total protein in liver and muscle of fish exposed to Cd alone and Cd with EDTA for 15 and 45 days. The addition of EDTA enhanced the total protein in liver and muscle to be better than that of Cd alone, but still lower than that of control group (P<0.05). This result indicates that the addition of EDTA failed to recover the total protein in liver and muscle. Table 7 showed that AST activity increased significantly in plasma of fish exposed to Cd alone. The addition of EDTA decreased significantly the AST activity to be less than that of Cd alone (P<0.05). The AST activity in fish exposed to Cd with 0.3 g EDTA/L became similar to that of control at 15 days and 45 days. The plasma ALT activity increased significantly in fish exposed to Cd alone at 15 and 45 days (53.93 and 83.66 IU/L, respectively. The addition of EDTA enhanced ALT activity to be as in the control especially the groups exposed to Cd with 0.2 & 0.3 g EDTA/L at both periods. The alkaline phosphatase (ALP) in plasma was significantly decreased in fish exposed to Cd (1.213 0.110 IU/L, P<0.05). On the other hand, addition of EDTA to Cd polluted media enhanced ALP activity in fish and became similar to that of control fish at 15 and 45 days. After 45 days, the ALP activity showed non significant variation in among treatments (Table 8). The acid phosphatase (ACP) increased significantly in fish exposed to Cd alone at 15 and 45 days (42.5 and 1.26 IU/L, P<0.05, respectively). Contrarily, the ACP activities of fish exposed to Cd with high dose EDTA became similar to that of control fish group at 15 and 45 days. Cd bioaccumulation : Addition of EDTA to the Cd polluted media reduced significantly (P<0.05) the Cd level in aquariums water as compared to that of Cd alone (Table 9). The Cd concentration in water in group exposed Cd alone was 9.32 mg/L and it significantly (P<0.05) decline to 7.15, 3.79, and 1.73 mg/l in groups of Cd with 0.1, 0.2 and 0.3 g EDTA/L respectively. The data showed a wide variation among the different organs of Nile tilapia subjected to Cd alone or Cd with different doses of EDTA. The highest amount of Cd residue was found in the liver and the lowest amount in the muscle. Table (9) showed that the uptake of Cd in the liver of fish exposed to Cd alone was 2.16 and 5.972 mg /g dry weight for 15 and 45 days, respectively, and it significantly declined to 1.292 and 4.16.; 0.94 and .79; and 0.42 and 2.45 mg/g dry weight in fish group exposed to Cd with 0.1, 0.2 and 0.3 g EDTA/L for 15 and 45 days, respectively. Similar trends were observed in fish gills and muscles. On the other hand, the Cd residue in fish faces increased significantly with increasing the level of EDTA in aquariums water. Discussion The results showed that the fish exposed to Cd alone showed a significant lower fish growth, feed intake and feed conversion than those exposed to Cd with different level of EDTA. The reduction of feed conversion rate in O. niloticus at sublethal levels of Cd might be due the tissue burden of more Cd, which in turn could cause reduction food intake, increase in metabolic cost and poor food conversion efficiency. These results are in agreement with those of James et al (1992) who found that Heeteropenustes fossillis exposed to mercury along with Eichhorina crassipes showed significant improvement in growth those exposed to mercury alone. Eichhorina crassipes removed considerable amount of mercury from test medium and thereby indirectly reduced the toxic effects on H. fossilis and this observation supports the present study. The present study reveals that the fish exposed to Cd alone showed significant reduction in RBCs, Hb and Hct than those exposed to Cd with different level of EDTA. The reduction of these parameters in Nile tilapia, O niloticus at sublethal levels of cadmium might be due to the destruction of mature RBCs and the inhibition of erythrocyte production due to reduction of haemsynthesis that affected by pollutants (Wintrobe, 1978). Also, the decrease in RBCs count may be attributed to haematopathology or acute haemolytic crisis that results in sever anemia in most vertebrates including fish species exposed to different environmental pollutants (khangarot and Tripathi, 1991) or may be the decrease in the RBCs may be attributed to reduction of growth and other food utilization parameters which results in sever aneamia ( James and Sampath, 1999). Also  HYPERLINK "http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=pubmed&cmd=Search&itool=pubmed_Abstract&term=%22Gill+TS%22%5BAuthor%5D" \o "Click to search for citations by this author." Gill and  HYPERLINK "http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=pubmed&cmd=Search&itool=pubmed_Abstract&term=%22Epple+A%22%5BAuthor%5D" \o "Click to search for citations by this author." Epple (1993) found a significant reduction in the RBCs, Hb and Hct in American eel (Anguilla rostrata) after exposure to 150 ug Cd/L.  HYPERLINK "http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=pubmed&cmd=Search&itool=pubmed_Abstract&term=%22Karuppasamy+R%22%5BAuthor%5D" \o "Click to search for citations by this author." Karuppasamy et al (2005) found a significant decreased in total erythrocyte count, haemoglobin content, haematocrit value and mean corpuscular haemoglobin concentration in air breathing fish, Channa punctatus after exposure to sublethal dose of Cd (29 mg Cd/L). The addition of EDTA improves the haematological parameters (RBCs, Hb and Hct) which indicating to the capability of EDTA to chelate Cd from the media. Subsequently, the Cd toxicity was reduced. These results are in agreement with those of James et al. (1998) who observed that Oreochromis mossambicus exposed to copper along with EDTA showed a significant improvement in blood parameters over those copper alone. The calculated blood indices MCV, MCH and MCHC have a particular importance in anemia diagnosis in most animals (Coles, 1986). The perturbations in these blood indices (increase MCV, decrease of MCH and MCHC) may be attributed to a defense against Cd toxicity through the stimulation of erythropiosis or may be related to the decrease in RBCs, Hb and Hct due to the exaggerated disturbances that occurred in both metabolic and hemopoietic activities of fish exposed to sublethal concentration of pollutants (Moussa, 1999). The present results indicate that EDTA is effective in removing Cd from water , and reducing Cd bioaccumulation in fish. Particulate organic matter which can scavenge metal from water and help to reduce metal from fish. These results are in agreement with Santschi (1988) who study that any agent that can remove Cd from water helps to reduce the bioaccumulation of this metal in fish. Blood glucose is a sensitive reliable indicator of environmental stress in fish. From the results , it is clear that Cd as shown by the elevated blood glucose level affected as a stress or on fish. Cd induced hyperglycemia with decreased in liver glycogen in catfish, Heteropneustes fossilis (Sastry and Subhadra 1985). Soengas et al (1996) suggested that hyperglycemia occurred in Atlantic salmon (Salmo salar) after toxicity with cadmium, may be due to changes in liver carbohydrate metabolism (activation of liver glycogenolysis and glycolysis) as well as increased levels of plasma glucose and lactate. However, the reduction the glucose concentration in plasma of fish along with EDTA is due to the removal of Cd by EDTA. Total protein level is a frequently parameter of metal poisoning in fish . However, data available did not allow to assessment of the direction of these changes, since the same metal may cause both an increase or a decrease in total protein. There were no changes in plasma total protein in fish exposed to cadmium at 15 days , while these values were decreased significantly in fish exposed to Cd only or with low levels of EDTA at 45 days. The present study showed that liver protein and muscle total protein was significantly decreased in fish exposed to Cd alone . This result may be attributed to the great demands and cellular damage that occurred in the tissues of Cd - toxicated fish and Cd toxicity may be possible cause protein breakdown. The addition of chelating agent EDTA to Cd polluted media reduced significantly the retention of Cd in fish body and this indirectly improved the growth and biochemical changes. (James and Sampath (1999) found similar results with catfish Heteropneustes fossilis. Total lipids in plasma increased significantly in fish exposed to Cd alone. On the other hand, addition of EDTA lowered total lipids in fish exposed to cadmium toxicity to be similar to that of the control fish. Shalaby (2001) reported that the absorption of excess heavy metals disturbed the metabolism of lipid.. The activity of AST and ALT enzymes in blood may also be used as a stress indicator. The significant changes in activities of these enzymes in blood plasma indicates tissue impairment caused by stress (James et al., 1991 and Svoboda 2001). In the present study, there were significant changes in AST and ALT activities in plasma of fish exposed to cadmium compared to the control group The increase in concentration of AST and ALT in blood plasma indicates impairment of parenchymatous organs (namely liver). In addition, the increase of plasma AST and ALT may be attributed to the hepatocellular damage or cellular degradation by these heavy metal, perhaps in liver, heart or muscle (Yamawaki et al., 1986). These results are in agreement with those of Shalaby (1997) who found that sublethal concentration of Cd caused significant increases in AST and ALT of common carp after 7 and 15 days. The decrease of ALP activity in plasma due to Cd toxicity was similar to that obtained by Sastry and Subhadra (1985) who recorded that a significant reduction in ALP in liver and kidney of catfish, Heteropneustes fossilis after toxication with Cd. This decrease may be due to the damage and dysfunction of the liver. EDTA reduced the Cd toxicity in water and fish which in turn enhanced the ALP activity. On other hand, The ACP activity increased significantly in fish exposed to Cd alone more than control. This result is in a agreement with Sastry and Subhadra (1985) who found that a significant increased in ACP in kidney of catfish, Heteropneustes fossilis after toxication with Cd. The obtained results showed that all the tested biochemical parameters were improved in due to EDTA application and they were more pronounced in Cd +0.3 g EDTA/l, which is considered as an optimum dose could improve the healthy status of fish. The present study showed that the addition of EDTA to the Cd media reduced significantly (P<0.05) the Cd level in water and metal uptake as compared to fish exposed to Cd alone. The Cd concentration in water was 9.23 mg/L and it decreased significantly (P< 0.05). The Cd accumulation in liver, gills and muscle of fish exposed to Cd alone was higher than that of EDTA. 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Pathol., 28: 53-56. Santschi, P. H (1988): Factors controlling the biogeochemical cycle of trace elements in fresh and coastal waters as revealed by artificial radioisotopes. Limnology and oceanography., 33:848- 886. Sastry, K. V and Subhadra, K (1985): In vivo effects of cadmium on some enzyme activities in tissues of the freshwater catfish, Heteropneustes fossilis. Environ. Res., 36 (1):32- 45. Shalaby , A. M. (1997) Biochemical and physiological studies on metal contamination in the common carp (Cyprinus carpio L). Zagazig University, Faculty of Science. (Benha branch). 268p. [Ph. D. Thesis] Shalaby, A. M. (2001): Protective effect of ascorbic acid against mercury intoxication in Nil;e tilapia (Oreochromius niloticus). J. Egypt. Acad. Soc. Environ. Develop., (D- Environmental studies)., 2 (3):79-97. Snedecor, G. W. and Cochran, W. G. (1982):Statistical Methods. 6th edition. Iowa State Univ. Press., Amer., IA, USA, pp 593. Soengas, J. L.; Agra-Lago, M. J.; Carballo, B.; Andres, M. D and Veira, J. A. R (1996): Effect of an acute exposure to sublethal concentration of cadmium on liver carbohydrate metabolism of Atlantic salmon (Salmo salar). Bull. Environ . Contam. Toxicol., 57: 625- 631. Spraggue, J. B( 1973): The ABCs of pollutant bioassay using fish In Biological methods for Assessment of water quality. ASTM 528. Amer. Testing. Material., pp.6-30. Svoboda, M (2001): Stress in fish review. Bul. VURH Vodnany., 37: 69- 191. Trinder, P. (1969): Determination of glucose concentration in the blood. Ann. Clin. Biochem., 6:24. Van Kampen, E. J. and Zijlstra, N. C. (1961): Determination of haemoglobin. Clin. Chem. Acta, 5: 719-720. Wintrobe, M. M (1978): In: Clinical hematology. Henry Kimpton, London., pp: 448. Yamawaki, K.; Hashimoto, W.; Fujii, K.; Koyama, J.; Ikeda, Y. and Ozaki, H. (1986): Hematological changes in carp exposed to low cadmium concentration . Bull of the Japanese. Soc. Sci. Fish., 59 (3):459- 466. Table (2): Growth performance of f Nile tilapia (O.niloticus) exposed to Cd with and without EDTA. ItemsInitial weight (G/fish)Finial weight (G/fish)WG (G/fish)SGR (%)Feed intakeFCR (g/feed/fish)Control 38.4 a 0.0455.6 ab 1.917.2 ac 1.30.805 a 0.01547.5 a 0.222.76 a 0.25Cd38.7 a 0.0542.3c 1.83.6 b 0.900.197b 0.0144.25 b 0.0612.29 b 1.6Cd+0.1g EDTA/l38.7 a 0.0553.31a 0.8014.6 c 1.10.711c 0.02146.91 a 0.313.21 a 0.4Cd+0.2g EDTA/l38.6 a 0.0355.49 ab 1.216.9 ac 0.90.806 a 0.0347.75 a 0.172.827 a 0.21 Cd+0.3g EDTA/l38.6 a 0.0256.4b 1.117.8 a 0.80.842 a 0.01447.99 a 0.272.696 a 0.52The same letter in the same column is not significantly different at P<0.05. Table (3): Changes in erythrocyte (count x 106/mm3), hemoglobin content (g/100ml) and haematocrit value (%) in the blood of Nile tilapia (O.niloticus) exposed to Cd with and without EDTA. ItemsErythrocyte count (RBCs)Hemoglobin (HB)Haematocrit value (Hct)Period15 days45 days15 days45 days15 days45 daysControl 1.59 a 0.072 1.715 a 0.0515.49 a 0.3547.316 a 0.13315..30 a 0.30817..33 a 1.666Cd1.268 b 0.0641.06 b 0.073 4.21 b 0.2364.12 c 0.35413..5 b 0.4712.02 b 0.577Cd+0.1g EDTA/l1.572 a 0.0621.57 d 0.0254.54 ab 0.3955.12 b 0.13514.66 a 1.452 15.06 a 0.76 Cd+0.2g EDTA/l1.56 a 0.0871.786 ac 0.0325.18 ab 0.4586.606 b 0.30715.02 a 1.7317.66 a 0.918Cd+0.3g EDTA/l1.957 c 0.0882.02 c 0.0616.466 c 0.2777.68 a 0.13320.0 c 0.36522.01 c 1.471 The same letter in the same column is not significantly different at P<0.05. Table (4): Changes in mean cell volume (MCV) , mean celll haemoglobin (MCH) and mean cell haemoglobin concentration (MCHC) in the blood of Nile tilapia (O.niloticus) exposed to Cd with or without EDTA. ItemsMCVMCHMCHCPeriod15 days45 days15 days45 days15 days45 daysControl96.22 ad 1.85101.04 a 2.23434.52 a 0.35142.11 a 1.45635.88 a 1.11742.21 a 0.939Cd106.97 b 2.23106.76 b 0.87433.02 b 0.17736.58 b 0.84631.18 b 0.90937.38b 1.85Cd+0.1 g EDTA/l93.25a 2.0495.92 a 4.2734.69 a 1.3232.61 b 1.1837.17a 1.2833..99 b 1.51Cd+0.2 g EDTA/l96.28a 2.5698.88 a 0.91433.20 a 1.6136.98 bc 1.5234.07 ac 1.4737..40 b 1.16Cd+0.3 g EDTA102.1db 2.52108.96 b 2.24333.84 a 1.70338.01 ac 1.57832.33 cb 0.94334.89 b 1.69 The same letter in the same column is not significantly different at P<0.05. Table (5): Changes in glucose, total protein and total lipids concentrations in plasma of Nile tilapia (O.niloticus) exposed to Cd with and without EDTA. ItemsGlucose (mg/L)Total protein (g/100ml)Total lipid (g/L)Period15 days45 days15 days45 days15 days45 daysControl 60.15a2.8941.32a2.2651.856a0.1973.163a0.1935.706a0.0846.553ad0.471Cd94.86b6.14151.82b7.481.653a0.207 1.53 b 0.07316.2 c 0.38613.303b0.307Cd+0.1gEDTA/l68.77c1.43 76.30c 3.952.173a0.1881.806b0.098 13.99b0.5719.391 c 0.370Cd+0.2gEDTA/l49.73a3.7671.50c 2.951.966a0.1211.84 b 0.1589.533d0.355.687 d 0.287Cd+0.3gEDTA/l55.05a1.45 54.46d 3.33 2.146a0.143 4.536c0.114 05.72a .0797.44 a 0.325The same letter in the same column is not significantly different at P<0.05. Table (6): Changes in total protein content ( mg/g fresh weight) in liver and muscle of Nile tilapia (O. niloticus) exposed to Cd with or without EDTA. ItemsLiverMusclePeriod15 days45 days15 days45 daysControl 122.8 a 4.115157.6 a 2.886169.8a 2.882211.6 a 4.494Cd66.5 b 2.7845..32 b 1.09845.8 b 1.89036.6 b 1.130Cd+0.1gEDTA/l58.5 c 1.739101.2 c 4.09458.4 c 2.78892.6 c 4.168Cd+0.2EDTA/l77..92 d 1.077124.6 d 3.45768.1 d 3.568130.5 d 2.826Cd+0.3gEDTA/l84.06 e 2.629132.06 d 4.29480.4 e 2.641156.3 e 4.111The same letter in the same column is not significantly different at P<0.05. Table (7): Changes in aspartate aminotransferase activity (AST)_and alanine aminotransferase (ALT) activity (IU/L) in plasma of Nile tilapia (O.niloticus) exposed to Cd with or without EDTA. ItemsASTALTPeriod15 days45 days15 days45 daysControl 51.49 a 1.795117.02 a 2.9932.966 a 2.5851.7 a 2.64Cd99.278 b 1.913167.7 b 3.25453.93 b 0.7683.66 b 2.46Cd+0.1g EDTA/l98.733 b 1.543127.02 a 2.2752.26 b 2.8661.26 c 3.21Cd+0.2g EDTA/l75.866 c 3.806125.43 a 2.6636.51 a 2.5342.05 a 3.65Cd+0.3g EDTA/l52.31 a 1.9854130.22 a 3.2844.75 c 2.4551.166 a 1.981The same letter in the same column is not significantly different at P<0.05. Table (8: Changes in Alkaline phosphatase (ALP) and Acid phosphatase (ACP) activities (IU/L) in plasma of Nile tilapia (O.niloticus) exposed to Cd with or without EDTA.. ItemsALPACPPeriod15 days45 days15 days45 daysControl2.49 a 0.5212.11 a 0.7215.1 a 2.936.5 a 27.6Cd1.213 b 0.110 1.51 a 0.6142.5 b 4.661.26 b 3.21 Cd+0.1g EDTA/l1.39 ab 0.323 1.532 a 0.4232.6 bc 2.8658.3 b 4.28Cd+0.2g EDTA/l1.77 ab 0.326 1.69 a 0.23 26.51 c 1.53 42.05 ca 1.65 Cd+0.3g EDTA/l1.831 ab0.2341.98 a 0.2814.75a 2.4537.16 a1.581 The same letter in the same column is not significantly different at P<0.05. Table (9): Changes in cadmium residue in water (mgCd/L), liver, gills, muscle and feces (mg Cd/g dry weigh) of Nile tilapia ( O. niloticus) exposed to to Cd with or without EDTA. ItemsWater Liver Gills Muscle Feces Period/days1545154515451545Control0.042 0.010.048 a 0.010.055 a 0.0040.038 a 0.010.039 a 0.020.023 a 0.0010.076 a 0.005 0.003 ab 0.0190.005 ab 0.01Cd9.32 08332.16 b 0.2545.972 b 0.861.37 b 0.0862.55 b 0.2860.475 b 0.061.078 b 0.160.152 b 0.0190.188 b 006Cd+0.1g EDTA/l7.15 0.33 1.292 c 0.0544.16 b 0.440.65 c 0.061.07 c 0.110.345c b 0.040.667 c 0.0210.942 c 0.032.067 c 0.142Cd+0.2g EDTA/l3.79 0.010.94 d 0.0543.792 b 0.290.394 d 0.0520.85 c 0.060.33 cb 0.08 0.383 d 0.0342.34 d 0.0695.442 d 0.343Cd+0.3g EDTA/l1.73 0.010.42 e 0.034 2.45 c 0.23 0.267 d 0.076 0.71 c 0.42 0.216 c 0.03 0.217 d 0.027 5.282 e 0.327.456 e 0.526The same letter in the same column is not significantly different at P<0.05. 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