Formula Oil crab berperan dalam proses percepatan matang ovari kepiting bakau. Tujuan penelitian ini adalah untuk mengetahui efektifitas pengembangan tingkat kematangan ovari (TKO) kepiting bakau (Scylla serrata) dengan penambahan formula oil crab pada sistem sirkulasi tertutup. Metode penelitian ini menggunakan Rancangan Acak Lengkap (RAL) dengan 2 perlakun yaitu perlakuan A: perlakuan tanpa formula oil crab (Kontrol) dan B: perlakuan penyuntikan formula oil crab dengan dosis 0,4 ml. Berdasarkan Hasil penelitian dari perlakuan A (Kontrol) tidak mengalami perkembangan ovari hingga berried, sedangkan perlakuan (B) Penambahan formula Oil Crab pada dosis 0,4 ml mendapatkan hasil yang terbaik bagi perkembangan ovari hingga berried pada rata-rata hari ke 41. Berdasarkan uji sidik ragam (ANOVA) menunjukkan bahwa pertumbuhan berat badan mutlak kepiting bakau selama pemeliharaan 60 hari memberikan hasil yang berbeda nyata (F < 0,05). Data kualitas air selama penelitian menunjukkan suhu berkisar 27-31 ℃, salinitas 15-18 ppt, DO 6,7-7,8 mg/L, dan pH 7.
Kata kunci: Kepiting Bakau, Formula Oil Crab, Sistem Resirkulasi

Oil crab formula plays a role in accelerating the maturation process of mud crabsa ovaries. This study aims to determine the effectiveness of ovarian maturatin level (TKO) of mud crabs (Scylla serrata) with the addition of oil crabs formula in a closed circulatory system. A: completely randomized design was conducted with two treatment, namely treatment A: treatment without oil crabs formula (Control) and B: treatment of a dose of 0,4 ml oil crabs formula addition. The result of the study showed that in treatment A (Control), there was no avarian development up to berried on the crabs, while in treatment B the addition of oil crabs formula at a dose 0,4 ml provided the best result for the ovarian development up to berried on an average day 41. Based on the analysis of variance (ANOVA), the test result showed that the absolute weight growth of mud crabs during 60 days rearing period was significantly different (F < 0,05). During the study, the water quality showed the temperature ranged from about 27-31 ℃, salinity was 15-18 ppt, Dissolved Oxygen (D0) was 6,7-7,8 mg/L, and pH 7. Keyword: Mud crabs, oil crabs formula, Recirculatory system