Reproductive and growth performances in female giant freshwater prawn following inhibition of gonadal maturation using dopamine and medroxyprogesterone hormonePerforma reproduksi dan pertumbuhan pascapenghambatan pematangan gonad udang galah betina secara hormonal menggunakan dopamin dan medroxyprogesteron ABSTRACT One of the main problem in giant river prawn (GFP) culture is early gonadal maturation in female resulting a reduced growth performance. This problem cause economic losses. When GFP at gonadal maturation, somatic growth will be inhibited because energy is used for reproduction. A factorial experimental design using two factors, namely dopamine and medroxyprogesterone, with each factor consist of three levels was applied. Three dopamine levels were 0, 10 -5 mol/shrimp, and 10 -10 mol/shrimp, while the medroxyprogesterone levels were 0, 75 mg/1.5 mL/bodyweight, and 150 mg/3 mL/bodyweight with a density 15 individual/tank. The utilization of dopamine and medroxyprogesterone in GFP (initial bodyweight : 11.27 ± 0.97 g) through injection at the third periopod was done three times at week 0, 2 nd , and 4 th with two weeks interval. The results showed that hormone inhibitor treatments affected both growth and reproductive performances in female GFP. The treated individuals showed a lower gonadal maturity indicator values and faster growth rate than control. Gonadal maturity, as shown by gonad histology, in all treatments were lower (previtelogenic and vitellogenic stages) than that in control which is in mature stage. Estradiol concentration premix dopamine 10 -10 mol/shrimp and medroxyprogesterone 150 mg/3 mL/ bodyweight treatments are lower than control. In conclusion, dopamine and medroxyprogesterone administration could suppres GSI and gonad development, and also increase growth rate.
ABSTRAKKematangan gonad dini induk udang galah Macrobrachium rosenbergii betina dapat merugikan. Saat udang matang gonad, pertumbuhan somatik terhambat disebabkan energi untuk pertumbuhan akan digunakan untuk reproduksi. Penelitian ini bertujuan mengevaluasi penggunaan hormon dopamin dan medroxyprogesterone sebagai penghambat pematangan gonad. Penelitian ini menggunakan rancangan acak lengkap faktorial dengan dua perlakuan yaitu pemberian dopamin dan medroxyprogesterone. Dosis dopamin yang digunakan yaitu 0, 10 -5 mol/udang, dan 10 -10 mol/udang, sedangkan medroxyprogesterone dengan dosis 0, 75 mg/1,5 mL/bobot udang, dan 150 mg/3 mL/bobot udang dengan kepadatan 15 ekor/bak. Udang galah betina (bobot awal:11,27 ± 0,97 g) diberi perlakuan berupa dopamin dan medroxyprogesterone sebanyak tiga kali pada minggu ke-0, 2, dan 4 dengan interval waktu dua minggu sekali. Hasil penelitian ini menunjukan perlakuan dopamin dan medroxyprogesterone memiliki nilai indeks kematangan gonad (IKG) yang rendah dan laju pertumbuhan yang lebih cepat dibandingkan kontrol. Histologi gonad pada semua perlakuan berada pada tahap previtellogenic dan vitellogenic dibandingkan kontrol yang berada pada tahap mature. Konsentrasi estradiol pada perlakuan pre...