MARIOARA NICULA, NICOLAE PACALA, LAVINIA STEF, IOAN PET, TIBERIU IANCU, DOREL DRONCA, MIRELA AHMADI, ADRIANA GHERBON, BOGDAN DELEANU IN VIVO EXPERIMENTS (CARASSIUS GIBELIO BLOCH) ON COPPER HOMEOSTASIS ALTERATION AFTER LEAD INTOXICATION AND NATURAL BIOLOGIC-ACTIVE PRINCIPLES TREATMENTS Minerals are involved in the most metabolic pathways and are necessary for living organisms in different concentrations. When the concentration of these biominerals is unbalanced due to different factors, the metabolic processes are disturbed and the organism tries to find recovery solutions. Cu is one mineral indispensable for living organism, also for fishes, and its concentration it could be drastically reduced by the presence of high concentration of some heavy metals – like Pb, due to antagonistic effect. Our research evaluates the Pb toxic potential on Carassius gibelio Bloch on Cu distribution in different tissues and two natural solutions for potentiation of antagonistic effect of Pb on Cu. We worked on four different fish groups: control group (C); and for three experimental groups we add 75 ppm Pb – as Pb(NO3)2 x ½H2O into the water from aquarium. To potent the Pb toxicity we add into the grounded fish feed 2% lyophilized garlic to E3 group and 2% chlorella to E4 group. Every group had 30 fishes in separate aquarium, the fishes were fed every 2 times a day and had 12h alternate light and dark. After 21 days of experiment the fishes were euthanized with cloves oil and the tissue samples were collected (brain, gill, gonads, intestine, kidney, liver, striated muscle – epaxial myotomes, cardiac muscle, and skin). The samples were analytical prepared for AAS in order to determinate the Cu concentration in all tissue samples. The results presented the best protection of garlic against antagonistic effect of Pb on Cu in brain and testicles, and the lowest protection in muscle-striatal; while chlorella best protection was observed in heart muscle, brain, kidney and liver, and lowest protection in muscle-striatal.