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¹ Airlangga University, Faculty of Veterinary Medicine, Department of Reproduction Veteriner, Surabaya, Indonesia DOI : 10.4194/2618-6381-v18_2_05 Viewed : 7122 - Downloaded : 3995 This study aims at observing the rate of estradiol-17β synthesis on vitellogenin and the ovary size of the Giant gourami broodstock candidates and female broodstock. The female broodstock candidates were reared in a pond, while the female broodstock were reared in several ponds with the male broodstock (2:1). The blood sample taking was done every week during the three-week observation. The purpose is to measure the concentration of estradiol-17β and vitellogenin. The observation on the broodstock candidates and the broodstock`s ovary size was done in the last week of the observation using veterinary ultrasound. Most of the estradiol-17β synthesis on the broodstock candidates is for vitellogenesis on the initial cycle of reproduction to reach maturation. In contrary, most of estradiol-17β synthesis on the female broodstock is not for vitellogenesis in the next spawning cycle. The observation shows that the size of the broodstock candidates and broodstock`s ovary is small. Keywords : Estradiol-17β, Vitellogenin, Ovary size, Osphronemus goramy