Changes in some blood parameters of a freshwater fish, Channa punctatus (Bloch) with reference to length, weight and sex.

摘要

The fishes Channa punctatus were divided into 5 groups as follows. Group-A (length 6-8 cm; weight 20-25 g); Group-B (length 8-10 cm; weight 25-30 g); Group-C (length 10-12 cm: weight 30-35 g); Group-D (length 12-14 cm; weight 35-40 g) and Group-E (length 14-16 cm: weight 40 g and above). A unique and synchronized inter-relationship between length (size), weight and different blood parameters was noted. The TEC, TLC, Hb%, PCV and MCHC exhibited an increase upto Group-D and thereafter showed a decrease in Group-E fishes whereas the MCH and MCV exhibited a gradual decrease upto Group-E fishes. The percentages of neutrophil, eosinophil and small lymphocyte exhibited a gradual increase upto Group-E and the percentages of large lymphocyte and thrombocyte showed a gradual decrease upto Group-E fishes. All the parameters of blood except the differential count of WBC under investigation showed a similar trend as described above in both the sexes. The percentages of neutrophil and large and small lymphocytes were slightly higher in males whereas, the percentage of thrombocyte was highest in females. The percentage of eosinophil was higher in female upto Group-C fishes and it was almost equal in both sexes in Group-D and E fishes.