Judul: Manipulation of catfish Clarias sp. rematuration using gonadotropin hormone and Spirulina sp. powder enriched diet.
Abstrak: Penelitian ini dilaksanakan pada Mei hingga Agustus 2011 di Kolam Percobaan Babakan Fakultas Perikanan dan Ilmu Kelautan, Institut Pertanian Bogor. Penelitian ini bertujuan untuk mempercepat masa rematurasi ikan lele menggunakan hormon gonadotropin (GtH) dengan dosis 5 IU dan 10 IU yang dikombinasikan dengan pemberian pakan yang ditambah tepung Spirulina sp. 2%. Penelitian ini terdiri dari 9 perlakuan dan 5 ulangan, perlakuan 1 (GtH 0 IU tanpa pemberian tepung Spirulina sp. 2%), perlakuan 2 (GtH 0 IU dan tepung Spirulina sp. 2% satu minggu), perlakuan 3 (GtH 0 IU dan tepung Spirulina sp. 2% dua minggu), perlakuan 4 (GtH 5 IU tanpa tepung Spirulina sp. 2%), perlakuan 5 (GtH 5 IU dan tepung Spirulina sp. 2% satu minggu), perlakuan 6 (GtH 5 IU dan tepung Spirulina sp. 2% dua minggu), perlakuan 7 (GtH 10 IU tanpa tepung Spirulina sp. 2%), perlakuan 8 (GtH 10 IU dan tepung Spirulina sp. 2% satu minggu), dan perlakuan 9 (GtH 10 IU dan tepung Spirulina sp. 2% dua minggu). Percobaan ini berhasil, ditandai dengan tingkat kebuntingan mencapai 80% dan 60% dari ikan uji mencapai kematangan gonad dalam 30 hari pemeliharaan. Kombinasi GtH 5 IU/kg/minggu selama 4 minggu dan penambahan tepung Spirulina sp. 2% pada pakan selama 1 minggu menunjukkan hasil terbaik yang mana ikan memproduksi telur sebanyak 51.720 butir/kg induk, dengan fertillization rate, hatching rate, dan survival rate lebih dari 90%. Masa rematurasi ikan lele dapat dipercepat dengan penggunaan kombinasi hormon GtH dan tepung Spirulina sp.
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Judul: Pemacuan Kematangan Gonad Ikan Lele Dumbo (Clarias sp.) Betina dengan Kombinasi Hormon PMSG dan Spirulina
Abstrak: The demand of catfish in the market has been growing annually. It is a significant errand for farmers to provide an amount of seed continually in an adequate number in order to support catfish production. Rematuration is one of the ways to enhance spawning frequency. The aim of the research was to develop a process for accelerate gonad maturity of female catfish using combination of Pregnant Mare Serum Gonadotropin (PMSG) mix hormone and the addition of Spirulina in feeds. PMSG dosage used were 0 IU, 5 IU, 10 IU and 20 IU , whereas Spirulina were 0%, 1.5% and 3%. The results showed that gonad maturity process of female catfish could be accelerated only in 4 weeks by administering the combination of PMSG mix hormone and Spirulina supplementation in the feeds. The treatment of PMSG mix 5 IU/kg weight seemed to be significantly effective to accelerate gonad maturity in female catfish.
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Judul: Tinjauan Matematis pada Model Makroskopik dan Mikroskopik Arus Lalu-lintas
Abstrak: Traffic flow phenomenon can be described through mathematical model such as continuous dynamic model with an ordinary differential equation so that it can be solved with integral factors. In this paper three simple models of traffic flow are discussed, i.e, two macroscopic and one microscopic models. Macroscopic model formulates dynamics of the traffic flow that occurs on a large number of vehicles on a road. While the microscopic model explains drivers’ behavior in their interaction with other vehicles ahead, i.e, car-following model. This paper shows the existence of ordinary differential equation found in the traffic flow model and indicates some different representations in the context of the same model. It also reviews a simple model of traffic flow along a single link, which leads to some unexpected results, i.e, it can express the solution model in term of link outflows as well as trip time. In the microscopic model, simulation is done to illustrate the behavior of the drivers with a sensitivity coefficient as a benchmark parameter.
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