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Hematological parameters are repeatedly used as an essential tool to assess the health condition of fish. The purpose of this study was to assess the reference values of some hematological parameters of Catla, catla catla collected from fresh water pond in a tropical climate of India from July 2011 to 2013. Variation in hematological parameters such as hemoglobin, erythrocyte count, total leucocytes count, hematocrit, mean corpuscular volume (MCV) and mean corpuscular hemoglobin concentration (MCHC) of fish were compared according to sex and seasonal differences. Analysis of variance showed that there were significant differences between sexes and the results indicated that the blood parameter levels between the sexes in summer were significantly different than that measure in other seasons except mean corpuscular hemoglobin(MCH) and (MCHC) value (P <0.05). The number of total leukocyte levels was found to be higher in female fish especially in breeding seasons, but the levels of hemoglobin, hematocrit and MCV values were high in male fish in an annual period. However, there was no difference in MCH and MCHC values between the sexes and seasons throughout the study period. These may be related to the seasons of sampling and changing physiological cycles during these months. The correlation between measured hematological parameters was also determined.

Seasonal Variations in Certain Hematological Factors of Catla Catla (Hamilton 1822)