Judul: Pertumbuhan dan kelangsungan hidup benih ikan redfin Epalzeorhynchos frenatum pada kepadatan yang berbeda.
Abstrak: In a good environmental condition and adequate quantity of food, an increase of stocking density will increase yield. This experiment was aimed to obtain information about the most optimum stocking density of redfin nursery culture. The initial size of redfin fry was 2.22±0.21 cm in length and 0.11±0.06 g in weight, which was obtained from a redfin farmer at Pagelaran, Dramaga, Bogor, West Java. Prior to experiment, the fry was adapted in the aquaria with a size of 30x20x20 cm3 which had been filled with 5 ℓ of water. The fry was then cultured at 4 different stocking density treatments. 2, 3, 4, 5 fry/ℓ with 3 replications for a period of 30 days. The fry was fed by Oligochaeta twice a day at satiation. Culture water was exchanged twice a day in the morning and on the afternoon with a rate depended on the stocking density; 40%/day, 60%/day, 80%/day and 100%/day, respectively. Stocking density significantly affected fish survival, specific grow rate, growth of absolute length and coefficient of variation (p<0.05) with 2 fry/ℓ density treatment resulted in the best production performance.
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Judul: Pertumbuhan dan kelangsungan hidup benih ikan Sinodontis Synodontis eupterus pada kepadatan yang berbeda
Abstrak: In a good environmental condition and adequate quantity of food, an increase of stocking density will increase yield. This experiment was aimed to obtain information about the most optimum stocking density of sinodontis nursery culture. The initial size of sinodontis fry was 2,54+0,11 cm in length and 2,97+0,43 g in weight, which was obtained from a sinodontis farmer at Pagelaran, Bogor, West Java. Prior to experiment, the fry was adapted in the aquaria with a size of 60x29x33 cm which had been filled with 20 ℓ of water. The fry was then cultured at 3 different stocking density treatments. 3, 6, 9 fry/ℓ with 3 replications for a period of 40 days. The fry fed a Limnodrilus sp. twice a day at satiation. Substitution of water exchanged twice a day in the morning and on the afternoon with a rate of 2x30% a day. The result indicated that stocking density did not significantly affected fish survival, specific grow rate, growth of absolute length and coefficient of variation (p>0.05). But when viewed from the economic efficiency, density of 9 fry/ℓ give the best results with the R/C ratio is greatest.
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Judul: Perbandingan Algoritma Message Digest 5 (MD5) Dan Secure Hash Algorithm 1 (Shai) Untuk Autentikasi Pesan
Abstrak: Seiring dcngan meningkatnya penggunaan internet sebagai media pertukaran pcsan. metodc pcngamanan pcsan menjadi sangat penting. Nilai suatu pesan yang ingin dijaga keutuhan atnu intcgritasnya menycbabkan pesan tcrscbut hanya baleh dimodifikasi olch pihak yang bcrhak. Namun pada rcalitanya, pesan tersebut akan mendapat ancaman dari scorang penyusup. Bentuk ancaman terjadi apabiJa pcnyusup dcngan suatu cara. dapat mengubah isi pesan terscbut untuk bcrbagai kepcntingan. Apabila isi pesan telah bcrubah dad bentuk aslinya, maka pesan terscbut dikatakan sudah tidak aulcnlik (asli) Iagi. Snatn metodc yang efektif untuk mcnguji kcautentikan suatll pesan digllnakan tcknik kriptografi. Pada kal)'a ilmiah ini akan dibahas algoritma Message Digest 5 (MDS) dan Secure !-lash Algorithm (SHAI) untuk autentikasi pesan.
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