Judul: Kinerja Pertumbuhan Ikan Nila Oreochromis niloticus Strain BEST pada Media Pemeliharaan dengan Derajat Kemasaman Berbeda
Abstrak: In Indonesia, peat land has pH degree that is relatively high, ranged from 3-5. Tilapia which is one of the superior commodities, is expected to be introduced in peat land as well as conducted with catfish. In order that, the production of tilapia is able to be improved optimally in more aquaculture lands of Indonesia. The objective of this study is analyze the work of growth in BEST tilapia strain, include Survival Rate, Specific Growth Rate, the growth of absolute length, amount of feed consumtion, feed efficiency, rearing media with acidity degree 3, 4, 5, and 6. Tilapia strain BEST that are used in the study size from 4,52±3,9 cm long and 1,35±0,3 g weight. The tilapias were placed in 12 aquariums with 60x50x40 cm in size and density as many as 40 fish each. The feed is the made-up feed (pellet) and given 3 times a day at satiation. Based on the result of this research, at 3 and 4 acidity degree the BEST strain tilapia couldn’t survive, showed by 0 % of survival rate. At 5 acidity degree, the survival rate was 50,8% whereas at 6 acidity degree was 75%. Growth rate either length growth and Specific Growth Rate at 5 acidity degree was slower than 6 acidity degree. Besides the acidity degree treatment on media could caused damaged in gill microanatomy include the damage such as hypertrophy, hyperplasia, fuse and telangiektasis with diffrent level of damage.
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Judul: Keragaan ikan nila BEST Oreochromis niloticus hasil seleksi di karamba jaring apung Danau Lido, Bogor
Abstrak: The strain BEST (Bogor Enhanced Strain Tilapia) is a new strain of tilapia developed from the sixth generation of GIFT (Genetic Improvement of Farmed Tilapia). Genetic environmental test of BEST has been done in various environment, one of them is in Lido lake. The objective of this research is to evaluate some commercial parameters (growth, SR, etc.) 9 families of BEST in experimental floating net cages. This research was conducted using 27 days-old fry, feeding with 10% of biomass daily for 60 days. Every family reared in floating net cage with density of 60 fish/m3. Observation data of weight, length and survival rate (SR) were collected every 10 days by sampling 50 fish from each family. The result showed that, the family 9 gave the highest growth rate. The family 9 had the highest daily growth rate, both in term of weight and length. Family 7 has varied in parameter observed value. The family 3 provided the highest SR and biomass. The results of this research shown that the population of family 3 had the highest production level. The study is also showed that the real heritability value is 0.009. This study recommend that the family 3 could be use as the candidate in the further selective breeding program.
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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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