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: effect of addition of Oodev and turmeric flour to feed on reproductive performance of sunset plati fish (Xiphophorus maculatus)
Abstrak: Ikan plati merupakan ikan hias air tawar yang banyak diminati masyarakat karena memiliki bentuk dan warna tubuh yang indah, selain itu harganya yang terjangkau membuat ikan ini laris di pasaran. Permasalahan utama yang dihadapi pembudidaya ikan plati adalah belum tercapainya target produksi untuk memenuhi kebutuhan pasar. Penelitian ini bertujuan mengaji pengaruh penambahan Oodev dan tepung kunyit serta kombinasi keduanya yang diberi pada pakan terhadap jumlah produksi ikan plati. Rancangan percobaan pada penelitian ini menggunakan rancangan acak lengkap dengan empat perlakuan yaitu perlakuan A (kontrol), B (Oodev 0.5 ml/kg induk), C (tepung kunyit 3%/kg pakan), dan D (Oodev 0.5 ml/kg induk + tepung kunyit 3%/kg pakan). Terdapat tiga ulangan pada masing-masing perlakuan. Parameter penelitian yang diamati diantaranya presentase induk bunting, presentase induk melahirkan, frekuensi induk melahirkan, produksi larva, dan tingkat kelangsungan hidup larva. Data diolah menggunakan ANOVA dan diuji lanjut dengan uji Duncan dengan selang kepercayaan 95% Hasil menunjukkan bahwa penambahan Oodev, tepung kunyit, dan kombinasi antara keduanya pada pakan setiap satu minggu dapat meningkatkan rata-rata produksi larva yang dihasilkan. Produksi larva total pada seluruh perlakuan diurut dari yang terbanyak adalah perlakuan D, B, C, dan A dengan masing-masing produksi larva yaitu 428, 251, 209, dan 93 ekor. Penambahan Oodev 0.5 ml/kg induk, tepung kunyit 3%/kg pakan, dan kombinasi keduanya pada pakan meningkatkan produksi larva sebanyak 3, 2, dan 5 kali dibanding kontrol. Persentase kelangsungan hidup larva diurut dari yang tertinggi terdapat pada perlakuan D, B, C, A yaitu 97.51%, 95.79%, 95.65%, 93.32%., Plati fish is a freshwater ornamental fish that is in great demand by the public because it has a beautiful body shape and color, besides its affordable price makes this fish best-selling in the market. The main problem faced by platy fish farmers is the production target has not been achieved to fulfill market needs. This study aims to examine the effect of addition Oodev and turmeric flour and the combination of both given to the amount of plati fish production. The experimental design in this study used a completely randomized design with four treatments, namely treatment A (control), B (Oodev 0.5 ml/kg brood), C (turmeric flour 3%/kg feed), and D (Oodev 0.5 ml/kg brood stock + turmeric flour 3%/kg feed). There were three replications for each treatment. The parameters observed were the percentage of pregnant mother, the percentage of mother giving birth, the frequency of mother giving birth, larval production, and the survival rate of larvae. The data were processed using ANOVA and further tested with Duncan's test with 95% confidence interval. The results showed that the addition of Oodev, turmeric flour, and a combination of the two in the feed every one week could increase the average production of larvae produced. The total larval production in all treatments was sorted from the highest to treatment D, B, C, and A with each larval production of 428, 251, 209, and 93 tails. The addition of Oodev 0.5 ml/kg brood stock, 3% turmeric flour/kg feed, and the combination of the two in the feed increased larval production by 3, 2, and 5 times compared to controls. The percentage of larval
Keyword: larvae, Oodev, plati, turmeric flour

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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