Judul: Performa Reproduksi Induk dan Benih Hibrida Ikan Lele Afrika Strain Sangkuriang dan Mesir pada Fase Pendederan
Abstrak: This study was performed to evaluate reproduction of broodstock and intraspecific hybrid juvenile performance of Egyptian African (M) and Sangkuriang catfish strains at nursery phase. Intraspecific hybridization of African catfish Clarias gariepinus was performed reciprocally (SM and MS) and purebreed (SS and MM), each was 3 replicates. Fish spawning was conducted by artificial fertilization, and larvae were reared at 1st, 2nd and 3rd nursery phases, subsequently. The results showed that broodstock performance of both strains were not significantly different (P>0.05) on all traits, except female’s gonadosomatic index. Fertilization and hatching rates of all hybrids were not significantly different (P>0.05). MM juvenile had higher growth performances but lower survival than other hybrids. Heterosis of total length, standard length, and body weight were varied, whereas the survival showed positive heterosis. SM juvenile showed positive growth heterosis in 3rd nursery phase (total length, standard length and body weight were 2.61; 2.16 and 4.79%, respectively). Survival heterosis of MS juvenile (24.20; 103.13 and 11.62%) was higher than SM juvenile (6.86; 48.57 and 3.09%) on all nursery phases.
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Judul: Pertumbuhan dan Kelangsungan Hidup Benih Ikan Lele Sangkuriang Diberi Hormon Pertumbuhan Rekombinan dengan Lama Perendaman Berbeda
Abstrak: Enhanced growth can highly contribute to the increased farming production. This research was conducted to compare the growth and survival of African catfish juvenile after immersion in water containing 2 mg/L recombinant giant grouper hormone (rElGH) for 2 and 4 hours. This research consisted of four treatments and three replications. A total of 100 catfish larvae at 5-day-old after hatching were hiperosmotic treated on 35 g/L salt solution for 2 minutes, and then bath immersed in a plastic packing containing 9 g/L salt solution, rElGH, and 100 mg/L bovine serum albumin (BSA). Control was created for each treatments and immersed in water containing 100 mg/L BSA. Fish were further maintained for 21 days in the aquarium, and fed on blood worm, ad libitum. The result showed that fish biomass of 4 hours treatment was approximately 25.12% higher compared to the control and 12.24% compared to 2 hours treatment. Fish survival in 4 hours treatment (60.0±8.3%) was higher than the 2 hours treatment (56.0±10.7%). Thus, the growth of Sangkuriang catfish seed can be improved by immersing in water containing rElGH during 4 hours, and this technology can be useful to improve African catfish farming.
Keyword: recombinant growth hormone., larval catfish, immersion

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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