Judul: Kajian kombinasi penambahan spirulina platensis pada pakan dan penyuntikan oodev terhadap kinerja reproduksi ikan nila.
Abstrak: Hatchery is one of important parts in aquaculture. This activity hopefully will go on continuously whole year in order to fulfill the seed required with good quantity and quality. Naturally, fish spawning time depends on environment signal. If environment have given the signal, the phisiological body system will work very well. The environment signal can be manipulated by hormone injection such as PMSG. Spawning fluency also depends on body nutrition status, because the material proceed from consumed feed. Therefore, fed by optimum nutrient is needed to improve gonad development. The raw material is determinant of consisted nutrient in. Feed can be added with any material which have ability to sustain reproduction activity, such as Spirulina. This study was held to evaluate and analyze combination between S. Platensis added in feed and Oodev (containing PMSG+antidopamin) injection on tilapia reproduction performance. Tilapia as object of this study represented unsyncronize fish. S. platensis consist of many importance nutrients for reproduction, such as high essential fatty acid and high protein. Oodev consist of PMSG containing Folicle Stimulating Hormone (FSH) that has important role in early maturation or vitellogenesis. The doses of S. Platensis added were 0%, 1%, 2%, and 3%. The doses of Oodev injected were 0 IU/kg and 10 IU/kg. Thereby, total treatments were eight combinations. The parameters that observed were egg diameter, fecundity, hatching rate, survival rate, spawning frequency, spawning time, egg quality, and larvae quality. In conclusion, the addition of S. platensis in feed and Oodev injection concurrently able to increase tilapia reproduction performance and total spawned fish. Based on this study, the best treatment was combination of S. platensis addition 2% and Oodev 10 IU/kg which showed average egg diameter 2.93 mm,average fecundity 1114 eggs/200 g body weight, average hatching rate 99.6%, and average larvae survival rate 93.5%. Egg and larvae protein respectively 62.49% and 65.5%.
Keyword: S.platensis, Oodev, tilapia, reproduction

Judul: The Effect of Melatonin and Oodev  through Feed to Increase Seed Production of Red Tilapia (Oreochromis sp.)
Abstrak: Kontinuitas ketersediaan benih ikan nila merah dipengaruhi oleh kemampuan reproduksi induk. Peningkatan jumlah benih ikan nila dapat dilakukan melalui rekayasa reproduksi dengan penggunaan hormon seperti Oodev dan melatonin. Tujuan penelitian ini adalah mengetahui performa produksi benih ikan nila merah dengan penambahan melatonin dan Oodev melalui pakan terhadap kualitas kematangan gonad induk dan produksi larva yang dihasilkan. Induk berukuran 100- 300 g diberi pakan yang mengandung kombinasi antara Oodev 0,5 ml/kg induk dan melatonin 0,25 mg/kg, 0,5 mg/kg, dan 0,75 mg/kg induk. Pakan diberikan secara restricted yaitu sebanyak 3% dari biomassa induk pada pagi dan sore selama 60 hari. Pemberian kombinasi Oodev 0,5 ml/kg induk dan melatonin 0,5 mg/kg induk melalui pakan merupakan dosis terbaik karena mampu meningkatkan nilai produksi sebesar 2,1 kali dari kontrol. Secara ekonomis perlakuan tersebut juga meningkatkan keuntungan sebesar 1,9 kali dari kontrol. Perlakuan penambahan melatonin tunggal terbaik yaitu pada dosis 0,75 mg/kg induk karena mampu meningkatkan produksi sebesar 1,6 dari kontrol. Pemberian kombinasi Oodev dan melatonin pada induk nila dapat meningkatkan produksi benih., The continuity of the availability of red tilapia seeds is influenced by the reproductive ability of the broodstock. Increasing the number of tilapia seeds can be done through reproductive manipulation using hormones such as Oodev and melatonin. The purpose of this study was to determine the performance of red tilapia seed production by adding melatonin and Oodev through feed for the quality of maturity of parent’s gonads and the larvae production. Tilapia measuring 100-300 g were fed a combination of Oodev 0,5 ml/kg bw and melatonin 0,25 mg/kg, 0,5 mg/kg, and 0,75 mg/kg bw. Feed is given in a restricted method, it was 3% of broodstock body weight, in the morning and evening for 60 days. The combination of Oodev 0,5 ml/kg bw and melatonin 0,5 mg/kg bw was the best dose because it was able to increase the production value 2,1 times from the control. Economically, this treatment also increases the gain 1,9 times from the control. While the best single addition of melatonin treatment is at a dose of 0,75 mg/kg bw because it can increase production 1,6 times from the control. Giving a combination of Oodev and melatonin to tilapia can increase seed production.
Keyword: Melatonin, Oodev, Tilapia

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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