Abstract: | The paper analyze the comparative growth of the anger and crap sapling during the active nourishing period (105-120 days), in the Dudãu I and Dudãu II ponds, from Iassy, in different conditions of ihtiopatologic prevention. The stipulated treatment scheme included 3 rounds, from wich the first one at population, the second one after one month, (when in the experimental basins were administrated each 20(A), respective, 40 kg lime chlorine/ha (B), and the third round in August, when the quantities were increased at 30 (A), respectively 50 kg lime chlorine /ha (B). In addition, at variant B two diets with antibiotic were administrated at intervals of 7 days. This treatment was administrated as prevention for the bacterial contamination. At the end of experiment, the rate of survival was of 95,6% at variant A and 97,2% at variant B. In addition we observe that at crap, comparing with the control, a supplementary increase was registered – 18.2%, and at singer a supplementary increase of 0.3%. In what regards the values of hematological indexes determined at the end of the experimental period for the specie crap, we observed an increase of hemoglobin with 4.18% at variant B, comparative with the control, as well as higher values of hematocrite –with 10.2% and of number of white globules with 18.25%. Moreover, as a result of parasite stress more intense, the fishes from control variant, depose a larger adaptive effort comparing with the variant with preventive treatments. This is expressed at hematological level through a larger number of red globules from the control with 4.1% and the average erythrocyte volume smaller with 14.8%. This is a response through which the fish better adapt their respiratory function counteract the supplementary stress, therefore by totalizing the surfaces of respiratory exchange to result values comparable with the one from the researched lot, where the fishes had a smaller number of erythrocytes and highest level of VEM. |
