Judul: Efisiensi hormon oksitosin dan ovaprim pada dosis berbeda dalam pemijahan buatan ikan lele Sangkuriang Clarias sp.
Abstrak: Catfish is a freshwater fish that has a high economic value. Larval production of catfish constantly improved through artificial spawning by injecting hormones. The purpose of this research was to determine the effectiveness and efficiency used of a combination oxytocin hormone and ovaprim on spawning female catfish with a mixture of different doses. The research consist of 5 treatments and 3 replications using complete random design. Treatment consist of P0 (ovaprim 100%), P1 (oxytocin 25% and ovaprim 75%), P2 (oxytocin 50% and ovaprim 50%), P3 (oxytocin 75% and ovaprim 25%) and P4 (oxytocin 100%). The best result showed that P3 or treatment dose of 75% oxytocin hormone and 25% ovaprim injection was the most efficient with an average ovulation time 9 hours 38 minutes and inducing cost Rp. 1 525,00,-.
Keyword: ovaprim., oxytocin, catfish, Hormone

Judul: Effect of giving Oodev and melatonin on reproductive performance of female pearl catfish (Clarias sp.)
Abstrak: Penelitian ini bertujuan mengetahui hasil kinerja reproduksi ikan lele mutiara (Clarias sp.) betina dengan penambahan melatonin dan Oodev melalui pakan. Terdapat enam perlakuan berbeda yaitu K (pakan tanpa Oodev dan melatonin), M1 (pakan dengan melatonin 0,5 mg/kg), M2 (pakan dengan melatonin 1 mg/kg), O (pakan dengan Oodev 0,25 mL/kg), OM1 (pakan dengan Oodev 0,25 mL/kg) dan melatonin 0,5 mg/kg), dan OM2 (pakan dengan Oodev 0,25 mL/kg dan melatonin 1 mg/kg). Ikan lele ukuran 800-1.200 g sebanyak 42 ekor dipelihara di dalam kolam terpal berdiameter 2,5 m dengan tinggi air 100 cm. Ikan diberi pakan dua kali sehari secara restricted dengan feeding rate sebesar 2%. Pengelolaan kualitas air dilakukan dengan cara mengukur kualitas air selama dua minggu sekali. Hasil penelitian menunjukkan bahwa pada semua parameter kinerja reproduksi; indeks gonad, fekunditas, diameter telur, derajat pembuahan, derajat penetasan, tingkat kelangsungan hidup benih, panjang benih dari ikan lele yang diberi pakan bersuplementasi melatonin dan Oodev menunjukkan nilai yang lebih baik dibandingkan dengan perlakuan lainnya (P<0,05). Dosis pemberian Oodev dan melatonin untuk menghasilkan kinerja reproduksi terbaik, yaitu Oodev 0,25 mL/kg dan melatonin 0,5 mg/kg., This study aims to determine the reproductive performance of female pearl catfish (Clarias sp.) with the addition of melatonin and Oodev through feed. There were six different treatments, namely K (feed without Oodev and melatonin), M1 (feed with melatonin 0.5 mg/kg), M2 (feed with melatonin 1 mg/kg), O (feed with Oodev 0.25 mL/kg) , OM1 (feed with Oodev 0.25 mL/kg) and melatonin 0.5 mg/kg), and OM2 (feed with Oodev 0.25 mL/kg and melatonin 1 mg/kg). 42 catfish measuring 800-1,200 g were kept in a tarpaulin pond with a diameter of 2.5 m with a water height of 100 cm. Fish were fed twice a day on a restricted basis with a feeding rate of 2%. Water quality management is carried out by measuring water quality once every two weeks. The results showed that on all parameters of reproductive performance; gonadosomatic index, fecundity, egg diameter, fertilization rate, hatching rate, seed survival rate, seed length of catfish fed with melatonin and Oodev supplementation showed better values than other treatments (P<0.05). The doses of Oodev and melatonin to produce the best reproductive performance were Oodev 0.25 mL/kg and melatonin 0.5 mg/kg. Keywords: catfish seeds, female catfish, melatonin, oodev, reproduction
Keyword: ikan lele, oodev, reproduksi, catfish seeds, female catfish, melatonin, oodev, reproduction

Judul: Metrik Einstein (Anti-) Self-Dual Berdimensi Empat dengan Metode Cartan
Abstrak: Gravitational field equation can be formulated in differential forms (differential geometry), which describes gravity as a manifestation of the curvature of space-time. Curvature of space-time is characterized by a metric that satisfies the gravitational field equation. With differential forms it can be formulated the (anti-) self-dual Einstein equation, which is a modification of the Cartan structure in (anti-) self-dual basis. Calculation of (anti-) self-dual metric with (anti-) self-dual Einstein equation is simpler than the calculation using Christoffel symbols.
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