Mean hematological parameters of small fish and big fish at the
beginning of the experimental period are given in Table 5. No
significant difference in any parameter between small and big fish was
observed (P≥0.08). Mean hematological parameters of fish at the end
of the experimental period under the four treatment combinations are
given in Table 6. Except for MCV (P=0.147), there was an effect of
fish size on all the parameters (Pb0.05), but no effect of oxygen level
on any of the parameters (PN0.5). As the fish grew bigger, RCB, HGB
and HCT became significantly higher (Pb0.001), while MCH and
MCHC became significantly lower (Pb0.05). There was no interaction
effect of fish size and oxygen level on any of the parameters (PN0.5).