INFLUENCE OF PROPHYLACTIC ANTIPARASITARY TREATMENTS ON SOME HEMATOLOGICAL INDICES VALUES IN CULTURED CYPRINIDS

C. Misăilă, Elena Rada Misăilă, Gabriela Dumitru

Abstract
The paper analyzes the hematological response of some one year-old cultured cyprinids, namely: common carp (Cyprinus carpio), silver carp (Hypophthalmichthys molitrix) and bighead carp (Aristichthys nobilis), grown in polyculture in 0.5 ha ponds, as part of an experiment (including some antiparasitary treatments) developed between April 2007 - April 2008. The ponds have been prophylactically treated in both the moment of their filling (April 2007) and during the fish growing period with preventive doses of 0.1 mg/L trichlorfon, in two steps, and 2 kg/ha calcium hypochlorite, two times/week. The mean concentration of hemoglobin (g Hb/dL blood), the ratio of figurative elements - i.e., the hematocryte (% Ht) and the number of erythrocytes (mil./µL), as well as the values of the erythrocytary constants (MCV, MCH, MCHC) - were determined both in November 2007 and in April 2008. In the end of wintering, the treated fish evidenced a more prosperous physiological condition, comparatively with the reference, the hemoglobin values recorded being higher with 17% in common carp and 19% in silver carp, as well as with 16% upper hematocryte values in common carp, 13% in silver carp and 10% in bighead carp. In the case of common carp, the number of erythrocytes registered in spring is 15-18% higher than the autumn values, 17-48% higher in bighead carp and 32% higher, respectively, in the treated silver carp.

Key words: cyprinids, antiparasitary preventive treatments, hematological indices