Judul: Pengaruh vitamin C terhadap pertumbuhan ikan lele (Clarias batrachus Linnaeus)
Abstrak: Percobaan ini bertujuan untuk mengetahui pertumbuhan ikan lele (Clarias batrachus Linnaeus) yang mendapat pakan tanpa vitamin C dan yang mendapat pakan dengan berbagai dosis vitamin C. Percobaan ini terdiri dari dua bagian, yaitu percobaan utama (populasi) dan penunjang (individu). Percobaan utama dan penunjang masing-masing menggunakan 15 buah wadah kayu yang dilapisi plastik tebal berwarna coklat tua, ukuran wadah 80 x 50 x 50 cm yang diisi air setinggi 25 cm. Ka dalam setiap wadah dimasukkan ikan lele ukuran 7 - 8 cm sebanyak 20 ekor dan wadah ditutup plastik transparan. Percabaan berfaktor tunggal ini menggunakan rancangan acak lengkap dengan perlakuan yaitu pakan buatan dengan dosis O, 25, 50, 75 dan 100 mg vitamin C/kg pakan den masing-masing diulang 3 kali. Pakan diberikan dalam bentuk pelet yang diremahkan dengan kadar protein 40% den energi 3240 kkal/ kg pakan. Pemberian pakan dilakukan 3 kali setiap hari yaitu pada pukul 07.30; 13.00 dan 17,30 dangan pambagian sama banyak. Ransum diberikan sebanyak 6% dari biomas ikan lele. dan selanjutnya setiap 10 hari sekali ransum diubah sesuai kebutuhannya. Peubah yang diamati dan dian.alisis yaitu laju pertumbuhan harian, kelangsungan hidup, efisiansi pemberian pakan dan gejala defisiensi. Untuk melihat respon pengaruh perlakuan diamati kan.dungan vitamin c_ dalam hati ikan den bentuk jaringan vertebrae dan lengkung insangnya. Percobaan ini dilakukan selama 20 minggu. yaitu 2 minggu untuk persiapan dan 18 minggu percobaan. Percobaan dimulai tanggal 16 Oktober sampai 28 Februari 1991 di kolam percobaan Fakultas Perikanan, Institut Pertanian Bogar. ...
Keyword: Cat fish

Judul: Efektivitas Penambahan Mannan Oligosakarida dan Vitamin C sebagai Feed Additive terhadap Kinerja Pertumbuhan ikan lele (Clarias sp.)
Abstrak: This study aimed to test of addition mannan oligosakarida (MOS) and vitamin C as feed additive on growth performance of Catfish (Clarias sp.). The feed used in this study is comercial feed with 39.4% protein dry weight content with the addition of feed additive is 3.6 g/kg. A total of 15,000 catfish (0.268 ± 0.26 gram) was reared for 20 days in tank (3 x 6x 0.5 m3) which has been equiped with aeration system. Fish feeding was conducted three times at 06.00, 16.00 and 24.00 (at satiation). The experimental design was a completely randomized design with 2 treatments and duplicate. The result showed that the amount of feed intake, protein retension and daily growth rate not significantly different (P>0,05). However, the biomass, feed conversion ratio (FCR) and survival rate in catfish with addition of feed additive in feed have significantly different (P<0,05). This result showed that the addition of MOS and vitamin C in catfish feed can decrease FCR and increase final biomass and survival rate (SR).
Keyword: MOS, vitamin C, feed additive, growth performance, Clarias sp.

Judul: Truncated Stop Loss as a Optimal Solution of Reinsurance Agreement in One-Period Model
Abstrak: Reinsurance is one of risk management efforts of an insurance company, which is called the cedent. Similar with insurance, reinsurance constitutes the cedent to pay the premium. We consider one-period reinsurance model and derive a rule which minimizes the ruin probability of the cedent for a fixed reinsurance premium. Therefore, it is needed to construct an optimal reinsurance agreement for the cedent. The premium is calculated according to four different principles, i.e. economic, generalized zero-utility, Esscher, and mean-variance principles. Stop loss is a reinsurance contract which protect the insurance company for losses that exceed a certain amount. The result of this research shows that a truncated stop loss is an optimal agreement in the class of all reinsurance contracts with various premiums calculated using above mentioned principles.
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