Efefects of feeding different dosages of 17 B-estradiol and vitamin C on the growth performance of koi, Cyprinus carpio

In this research, the effects of different dosages of dietary 17 β- estradiol andVitamin C (Vit. C ) applied combined were investigated, on the growth performance ofkoi (Cyprinus carpio) (mean initial weight 15.51±0,31). The study was conducted inthree replicate according to experiment plan with randomized design in concrete pond(0,75×4,60×0,80 m). In this study, control group was fed with commercial trout feed,while experimental group were fed diets supplemented with 5+187,5 (17β-estradiol+Vit. C), 10+255 (17β- estradiol+Vit. C), 15+300 (17β- estradiol+Vit. C)mg/kg. Samplings were carried out every 15 days and study was finished in 75 days. Atthe end of the study, it was found that body weight averages were respectively,81,00±5,56 g, 82,55±4,29 g, 83,13±3,08 g and 90,13±6,82 g and total length averageswere respectively, 16,89±0,39 cm, 16,91±0,29 cm, 16,94±0,31 cm and 17,60±0,53.Survival rates was determined 100 %. It was no found significantly differences amongsgroups according to statistical analysis (P>0,05).As a result, vitamin C dosages that exposured been effective on survival rates offishes. 5,10,15 mg/kg dosages of 17 β- estradiol that administered to groups, weren?tbeen adequate for growth performance of koi. These results suggested that growthperformance in the koi could be effected by exposure to 17 β- estradiol greater than 15mg/kg dosages.Key Words: 17β- estradiol, Vitamin C, Cyprinus carpio, Growth, Koi