the effect of natural pigment of beta vulgaris and madder rubia tinctorum on skin tonality and index of growth of white angel fish pterophyllum scalare

abstract in this research we have considered the effect of using natural pigment like (beta vulgaris) and (rubia tinctorum) and compound of these two pigments on white angel fish (pterophyllum scalare).. this consideration on 76 white angel fish with average weight of 1.12±0.5gr in 5 treatments including 5 and 10gr madder in kg food, 5 and 10gr red beet per kg food and combined treatment(5gr madder adding to 5gr red beet) per kg food and control group. feeding was done 3 times a day and to the degree of 10% of the weight of fishes’ body. at the end taking photo was done by equal condition through digital cameras and degree of tonality of fish skin has been considered through lab system of photoshop. also some index of growth like bwi, fcr, and sgr. at the end of period fishes fed up with foods having 10kg/kg red beet has had more clear yellow color than control group and other treatments(p<0.05). also fishes fed up with higher dose of red beet and madder has had more growth than other treatments (p<0.05).