HEMATOLOGICAL CHANGES IN SOME FARMING CYPRINIDS UNDER THE HIBERNATION CONDITIONS
Keywords:
social stress, thermal stress, farmed cyprinidsAbstract
The study presents the hematological results of comparative determinations made
before and after winter period (2006-2007 in one summer-old common carp, silver
carp and bighead carp (C0+). Our previous researches (Misăilă et al., 2004) show
that, hypothermia and high storage density induce in farming fish a winter chronic
stress state. So, in the two summer-old common carp, silver carp and bighead carp
evidenced a pronouncedly hematological insufficiency, with the diminution of
hemoglobin level at the end of winter with 11-26% against those from the winter
beginning, as well as diminution of the hematocryte with 18-20% and of the number
of erythrocytes with 25-45%. Also, Bejerano (1984) point out the diminution of Hb
level from 4.5 to 3.8 g/dl in tilapia after a rapid acclimatization to under-lethal
temperatures. The results of these researches made in one summer-old cyprinid
fries: common carp (Cyprinus carpio), silver carp (Hypophthalmichthys molitrix)
and bighead carp (Aristichthys nobilis), subjected to the wintering density of 15 t/ha
and in unusual gentle winters conditions (2006-2007) evidenced a different
response, suggesting the absence of conditions of stress installation, through the
hematological indices values. In addition, was observed a differentiate response of
three species in the experimental mentioned conditions. Thus, in common carp, the
average of obtained values in the end of the winter (March) were comparable with
the one from November-December, differences registered being situate below 3% in
the case of Hb concentration (g/dl), hematocryte (%) and number of erythrocyte
(mil./µl) and below 5% in the case of MCH and MCHC values. In silver carp,
differences are situate below 3% in the Hb case, number of erythrocytes and MCH
and of 7-11% in the case of Ht, MCV and MCHC. In bighead carp, the values from
the end of the winter are less than prehibernation period ones with 5% to Ht, 16% to
MCH and 30% in the case of MCHC, respectively, bigger values than these with
11.5% (Hb), 20% (MCHC) and 37% (number of erythrocytes).
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