HEMATOLOGICAL RESEARCHES IN SOME FARMING CYPRINIDS IN CONTROL CONDITIONS OF THE PARASITICAL STRESS

Abstract

The present study analyses the hematological responses of some one year-old
cultured cyprinids (C1+) - common carp (Cyprinus carpio), silver carp
(Hypophthalmichthys molitrix) and bighead carp (Aristichthys nobilis) - grown in
polyculture for 220 days, in the conditions of an antiparasitical treatment, applied
both as prophylactic one and along to the growth period (Trichlorfon preventive in
doses of 0. 1 mg/l in two steps and Calcium hypochlorite 2kg/ha two times/week).
The usual hematological indices values, determinate in the end of the experiments
evidenced the fact that, in two variant taken under study both the levels of Hb, Ht
and the number of red blood cells behave the oscillations between normal limits for
C1+ cyprinids, with notable differences between three species. In common carp, the
values of all three indices from the research variant maintained with 11-12% lower
than in the control variant, to the antipodes being bighead carp, in which all indices
have in variant of research the bigger values with 11-32% than the control. This
suggests that in common carp, respiratory functions accommodation is canalized
less on quantitative line, rising on Hb quantity and more on qualitative line, the Hb
capacity rise to bound the oxygen, and in bighead carp the tendency is reverse. In
silver carp, the Hb values and the erythrocytes number are less with 8-23% in
variant of research than to the control, while the hematocryte is with 13% elder than
to the control variant, in correlation with the MCV values, which are with 43%
bigger than to the lot of research.