Growth performances and phys responses of background color adaptation were Six groups of (initial body weight 16 g) reared in ten individuals each black, green and white tanks (two replicate groups color end of the experiment, blood (cortiso glucose, haematocrit, cholesterol, triglycerides, total lipids, osmo pco2 pH), liver (total glycogen, sion ratio, condition index) growth (body weight, specific growth rate, food conver Plasma cortisol levels factor, proximate carcass parameters were determined black, while in w adapted carp were significantly (P lower those than gree adapted fish did not differ significantly from those in both other counterparts, White-adapted carp showed the highest specific growth rate and the lowest conversion ratio, whereas black-adapted fish exhibited the opposite pattern. In addi on, mean increase of body weight in white-adapted carp was 4.66 and 3.58% than that in black- and green-adapted fish, respectively. Furthermore in carp blood poco, and pH were significantly higher and lower, respectively, than those obtained in black- and green-adapted fish. In black-adapted carp, liver total lipid levels were significantly lower, and plasma total lipid levels were significantly higher, than those in white- and