Judul: Kelangsungan hidup benih ikan patin Pangasionodon sp. ukuran 1 inci pasca pengangkutan menggunakan sistem tertutup dengan media bersalinitas 1, 2 dan 3 ppt.
Abstrak: Pangas catfish is one of aquaculture main commodity in Indonesia and a commodity with significant increase production during 2007-2008. Suppliers often encounter a problem from the low survival rate during the fry transportation which is caused by poor water quality. Therefore, a research to increase the survival rate on closed system transportation as an effort to increase profit on fish marketing is needed. Osmoregulation (osmotic pressure) is a parameter changed during transportation. The change itself can be balanced with salinity addition, which in turn affect the organism osmoregulation. Determining the optimal salinity will affect fry survival rate during transportation. The research was conducted between April 2010 and May 2010 at Laboratory of Production Technique and Management Aquaculture, Aquaculture Department, Faculty of Fisheries and Marine Science, Bogor Agriculture University. Water quality parameters was measured at Environmental Laboratory, Aquaculture Department, Faculty of Fisheries and Marine Science, Bogor Agriculture University and osmotic pressure measurement was conducted at Embriology Laboratory, Veterinary Faculty, Bogor Agriculture University. Fish rearing pre and post transportation treatment was conducted at Yohanes Tropical Fish Farm, Cogreg Village, Parung, Bogor. This research used 1 inch fry with 2,58±0,03 cm average length and average weight 0,21±0,02 gram provided from Cogreg Village, Parung, Bogor Regency, West Java. The fry was transported in 12 Poly Ethylene (PE) plastic bag filled with 1,25 litre water. Whereas post transportation fish located in 12 aquarium filled with 144 litre water at 30 cm water height. During fry rearing, the fry were fed on shrimp feed (protein 40%) twice a day at morning and afternoon with at satiation method. Water at the aquarium was changed by 10% everyday (5% in the morning and 5 % in the afternoon). Results on salinity addition on transportation media after 3 days post transportation showed survival rate 90%; 91%, 94,67% and 96,33%; and market profit Rp 6.259.935,00; Rp 7.272.935,00; Rp 8.731.315,00; and Rp.9.477.555,00 respectively. Salinity addition on the transportation water medium 0 ppt, 1 ppt, 2 ppt and 3 ppt affect survival rate of pangas catfish fry (P>0,05). Salinity at 3 ppt gave the highest fry survival rate and market profit
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Judul: Efektifitas Penambahan Zeolit dan Karbon Aktif Terhadap Kelangsungan Hidup Benih Ikan Patin Pangasionodon sp. Pada pengangkutan Sistem Tertutup
Abstrak: The problem often faced by Indonesian farmers in striped catfish (Pangasionodon sp) fry transportation is low survival rate due to changes in water quality during transportation caused by high consentration of CO2, ammonia accumulation, fish activity, bacterial infection and physical wound from rough handling. An attempt done to neutralize toxic ammonia that is by adding zeolite and active carbon to packing medium, where the zeolites and activated carbon is a material capable of adsorbing ammonia for a certain time. This research used zeolite and carbon composition A (20 g zeolite), B (15 g zeolite + 5 g activated carbon), C (10 g zeolite + 10 g activated carbon), D (5 g zeolite + 15 g activated carbon) and E (20 g activated carbon). Fish density used 300 fry/ℓ for 72 hours every 24 hours samples were taken to measure water quality (DO, TAN, NH3, pH, temperature, CO2). This research resulted thst 5 g zeolite + 15 g activated carbon addition gave the best results with the highest survival rate of 83.3 ± 6.79%, TAN concentration of 4.6816 ± 0.628 mg / ℓ and NH3 concentration of 0.0228 ± 0.005 mg / ℓ, the temperature of 19.7 to 22 ° C, DO of ± 1.99 mgO2, CO2 sebesar 62,84± 5,53 mg/ℓ.
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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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