Judul: Penggunaan “spwanprim” untuk merangsang Ovulasi pada ikan patin (pangasionodon Hypothalmus)
Abstrak: Aquaculture is an activity culture for fish that have a good prospect. In all many kind of fishes that be cultured, Pangasionodon hypothalamus is a one of the fish which have good prospect in hatchery industry. However, the breeding of catfish (Pangasionodon hypothalmus) can only be done by artificial spawning with hormonal stimulation. Aromatase inhibitor (AI) have been known to accelarate the process of gonadal maturation in fish. The combination of aromatase inhibitor (AI), antidopamine (AD) and LHRHa has been used to accelerate the final maturation and also as a substitute LHRHa. In this study, various doses of LHRHa 0, 5,10, 15 μg/ml combined with AI and AD, which later named Spawnprim A, B, C, and D, then injected the fish with a dose of 0,7 ml/kg fish. Ovaprim has been used as a positive control and physilogical solution as a negative control. Fish injected with HCG at a dose of 0,3 ml/kg fish 24 hours before injection with spawnprim or ovaprim. Ovulation has been observed by artificially spawning by stripping. The result showed that fish injected with spawnprim been able to ovulate with good quality eggs at 14 hours after the time of injection or 2 hours late compared with ovaprim. Spawnprim can be used as an alternative in the artificial spawning with hormonal stimulating with hormonal stimulation with a more economical price.
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Judul: Induction of Ovulation and Spawning in Catfish (Pangasianodon hypopthalmus) with Hormonal Manipulation
Abstrak: Striped catfish is a species introduced from Thailand, has economically important because the meat is preferred by Indonesian society. Fish farming is growing rapidly, thus increasing the need for seed. Spawning of these fish can only be done by artificial spawning by stripping, which can lead to decreased quality of broodstock, gametes and seeds. The purposeof this study is to hormonally induce ovulation and spawning of seminatural for catfish and evaluate the effectiveness and efficiency of the use of hormone LHRH, antidopamin (AD), aromatase inhibitors (AI), prostaglandin(PGF2a), oxytocin and ovaprim to induce ovulation and spawning on this fish. Mature fish (1.5 - 3.5 kg per fish), was treated by hormonal injection with: LHRHa + AI (Spawnprime 1); AD + AI (Spawnprime 2); LHRHa + AD + AI + PGF2α (Spawnprime 3); LHRHa + AD + AI + PGF2α + oxytocin (Spawnprime 4); LHRHa + AD + oxytocin (Spawnprime 5); LHRHa + AD + PGF2α (spawnprime 6), AI + oxytocin (spawnprime 7), AI + PGF2α (spawnprime 8); ovaprim, and NaCl (0.90%). The results showed that spawnprime has faster latency period (6-8 hours) compared ovaprim (12 hours). spawnprime 1, 2, 5, and 6 can be spawned artificially by stipping, while spawnprime 3,4,7 and 8 naturally. The best results were shown by spawnprime 4 which causes ovulation rate of 100%. The latency period in spawnprime 4 is 6 hours and 33 minutes, the amount of egg in ovulation time is 195.000 ± 41079.19 eggs, the fertilization rate is 91.87% ± 3.03, the hatching rate is 92.33% ± 5.86, the survival rate of larvae 93.91% ± 2.96, diameter egg is 1.05 ± 0.04 mm and concentrations of estradiol 0.7 pg / ml. spawnprime can induced for ovulation and ntural spawning (without stripping) on stripped catfish. Spawnprime can be used as an alternative in the artificial propagation.
Keyword: catfish (Pangasianodon hypopthalmus), ovaprim, spawnprime

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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