Judul: Pemberian Kombinasi Pakan Buatan dan Cacing Sutera terhadap Pertumbuhan dan Kelangsungan Hidup pada Benih Ikan Lele Clarias sp. Umur 4 Hari
Abstrak: Catfish hatchery activities still require natural feed which is silk worms. The availability of silk worms in nature are limited to its season. This research is purpose for know influence the feeding combinations artificial feed and silk worms with the different percentage towadrs growth and survival of catfish seed. Seed in the form of larvae of catfish was 4 days with a density of 10 fish/l in a container measuring 20x20x20 cm aquarium. Feed that is given (30-50%) of its average weight each day for 20 days of maintenance. The treatment are silk worms 100% (PA), artificial feed 100% (PB), artificial feed 75% and silk worms 25% (PB75+PA25), artificial feed 50% and silk worms 50% (PB50+PA50), artificial feed 25% and silk worms 75% (PB25+PA75). The results showed that seed catfish fed PB50 + PA50 have the growth of catfish good seed is weights 25+0,01mg, the absolute length of 2,04+0,04cm, the average length of 2,79+0,04cm, coefficient of variability average length 19.95+1,95%, and survival rate 85.55+0,96%.
Keyword: artificial feed, Silk worms, Catfish Clarias sp

Judul: Kombinasi Cacing Sutradan Pakan Buatan yang Ditambah Probiotik pada Pemeliharaan Larva Ikan Lele Clarias sp.
Abstrak: This study was conducted to evaluate sludge worm, artificial diet and probioticas a diet of larval Clarias sp. One day old larvae with total length of 0.5 ± 0.03 cm were stocked into a 15 plastic container diameter of 40 cm and filled with water up to 15 cm. D2 Clariaslarvae were fed on Artemiasalina. From d3 till d8,the larvae were fed on either sludge worm, artificial diet plus sludge worm, artificial dietplus probiotics plus sludge worm, artificial diet, or artificial diet plus probiotics. During the period of d9 till d14, they were fed on artificial diet. Results showed that larvae fed on sludge worm had significantly the highest survival rate (95 %); size distribution of lavae in this groups was also dominated by the large fish (72.5 %). On the other hand, larvae fed on artificial diet had the lowest survival rate (73.4 %), and was dominated by the small fish (99.5%). Protein efficiency ratio between sludge worm and artificial diet treatments were not significantly different. However, the addition of probioticinto the artificial diet enhanced the protein efficiency ratio and the growth of larvae.
Keyword: Larvae, Clarias sp., sludge worm, artificial diet, probiotic

Judul: igenvalues and Eigenvectors of Tridiagonal Matrix with Non Constant and Recurrent Diagonal Entries.
Abstrak: Matriks tridiagonal adalah suatu matriks yang mempunyai entri-entri bernilai nol kecuali pada diagonal utama, di bawah diagonal utama (subdiagonal) dan di atas diagonal utama (superdiagonal). Entri pada diagonal utama tidak konstan dan berulang. Setiap entri pada matriks tridiagonal ini adalah bilangan kompleks. Dalam karya ilmiah ini, akan dibuktikan 3 teorema untuk menentukan nilai eigen dengan 2 kasus dan 1 teorema untuk menentukan vektor eigen. Teorema pertama menentukan polinomial karakteristik dari matriks tridiagonal. Polinomial karakteristik dari matriks tridiagonal tersebut digunakan untuk menentukan nilai eigen pada teorema kedua dan ketiga serta menentukan vektor eigen pada teorema keempat
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