حاجی محمد شیرمحمدلی

Environmental, nutritional, size and age conditions cause many direct and indirect changes in the blood and serum indices of fish in different species. The aim of this study was to determine and evaluate the changes in hematological indicators and some biochemical indicators of Cyprinus carpio blood serum in different weights.  For this purpose, common carp farmed in the weight range of 500 to 2000 g were examined and analyzed in 5 weight groups of 500, 700, 1000, 1300 and 1600 g.  The studied fish were bred and examined in a 2-hectare pool in one of the farms of Sari city under the same conditions. To perform blood tests, 5 fish were used in each weight group and blood sampling was performed by cutting the vein of the caudal stem vein. The results of the study of hematological indicators and some serum biochemical indicators showed that in different weights, significant changes in the amount of red blood cells, hemoglobin, hematocrit, mean red blood cell volume, mean hemoglobin concentration, mean red blood cell hemoglobin concentration, white blood cells, lymphocyte, monocyte, granulocytes, glucose, urea, triglycerides, cholesterol, phosphorus, calcium, sodium, potassium, albumin, and total protein were not observed (P> 0.05). The results of the present study showed that weight changes did not affect the hematological indicators and some biochemical indicators of common carp blood serum.

In this study, the relationship between fish weight and hematological changes and some biochemical indices of serum of silver carp were studied. For this purpose, the carps of silver carp were sampled in 5 groups: 500, 700, 1000, 1300 and 1600 grams. In order to evaluate the blood indices of silver carp in each weighing group, 5 fishes were selected and then, to facilitate sampling, using tail cropping was done. Then the serum hematological and biochemical factors were determined in the hematologic laboratory and by automatic devices. Based on the results, it was found that increasing the weight of silver carp did not change the amount of white blood cells, red blood cells, hemoglobin, hematocrit, MCV, MCH, MCHC, PLT, lymphocyte, monocyte and granulocyte, and there was no significant difference in the weight different groups (P> 0.05). Also, the results of some biochemical indices in serum showed that, except for calcium weighed 1600 grams of silver carp, weighed more than other groups (P <0.05), weight gain has no effect on glucose, urea, triglyceride, cholesterol, phosphorus, sodium, potassium, albumin and total protein (P> 0.05). The results of this study showed that changes in body weight of silver carp in a similar age did not affect the blood indexes.

The body chemical composition in aquatic organisms is related to nutrition, habitat, age and sex. On the other hand, knowing the amount of chemical compositions helps to select the appropriate species for human nutrition and food industry. In this study, the change in chemical composition of common carp in different weights was investigated. For this purpose, 25 two-year-old carp were studied during the second year of rearing from different weight groups from 500 g to 1600 g. Protein, fat, ash and dry matter content of fish meat were measured. The results showed that the mean protein content of carp was 10.209 ± 2.106 %, fat was 9.429 ± 0.937%, ash 1.407 ± 198 % and dry matter 21.13 ± 1.62%, respectively. In addition, the results of this study indicate that there is no significant difference between chemical compositions of carp in different weights (P> 0.05). The results of the present study show that there is no relationship between chemical compositions (protein, fat, ash, dry matter) and the weight of common carp and the weight of fish has no effect on the chemical compositions. Therefore, there is no difference in common carp meat chemical compositions in different weights.