Judul: Kinerja Pertumbuhan Ikan Bawal Bintang Trachinotus blochii di Karamba Jaring Apung yang Diberi Pakan Berkadar Protein Berbeda
Abstrak: Ikan bawal bintang Trachinotus blochii merupakan salah satu komoditas yang memiliki nilai ekonomis tinggi, namun kebutuhan proteinnya masih belum diketahui. Penelitian ini bertujuan untuk menentukan kadar protein optimal dalam pakan ikan bawal bintang T. blochii. Ikan uji yang digunakan memiliki panjang rata-rata 19,47 ± 0,36 cm dan bobot rata-rata 97,30 ± 2,23 g. Ikan dipelihara selama 90 hari dalam karamba jaring apung dengan padat tebar 205 ekor/jaring. Perlakuan terdiri atas pakan formula dengan kadar protein 35% (A), 37% (B) dan pakan komersial dengan kadar protein 37% (K). Pemberian pakan dilakukan dua kali sehari sampai ikan kenyang. Hasil penelitian ini menunjukkan bahwa laju pertumbuhan terbaik teramati pada ikan yang diberi pakan dengan kadar protein 37%, yaitu 0,73˗0,74 %/hari. Pakan K memberikan rasio efisiensi protein, retensi protein, jumlah konsumsi pakan, dan rasio konversi pakan terbaik (P<0,05).
Keyword: ikan bawal bintang, laju pertumbuhan harian, protein

Judul: Growth and Production Performance of Tambaqui Colossoma macropomum Given Different Commercial Feeds in Cirata Reservoir, West Java.
Abstrak: Keberhasilan budidaya intensif salah satunya ditentukan oleh kualitas pakan. Pakan berkontribusi besar dalam biaya produksi hingga mencapai 60-80%. Penelitian ini bertujuan membandingkan pengaruh lima produk pakan komersial berbeda terhadap kinerja pertumbuhan dan produksi ikan bawal (Colossoma macropomum) yang dipelihara di keramba jaring apung di Waduk Cirata. Penelitian ini menggunakan lima produk pakan komersial yaitu pakan komersial A dengan kadar protein (28,11%), pakan komersial B (28,56%), pakan komersial C (26,33%), pakan komersial D (28,11%), dan pakan komersial E (31,68%). Ikan dengan ukuran awal 10±0,1 g, dipelihara di keramba jaring apung berukuran 7 m × 7 m × 3,5 m dengan padat tebar 24 ekor/m³ selama 83 hari dengan frekuensi pemberian pakan sebanyak dua kali sehari, yaitu pukul 08.0˗009.00 dan 16.00˗17.00 secara ad satiation. Hasil penelitian menunjukkan bahwa pakan E dengan kadar protein 31,68% memberikan nilai biomassa akhir, bobot rata-rata, laju pertumbuhan harian, retensi protein, dan retensi lemak tertinggi, serta feed cost per gain dan nilai konversi pakan terendah dibandingkan lima perlakuan lainnya. Berdasarkan hasil penelitian ini dapat disimpulkan kinerja pertumbuhan dan produksi ikan bawal (Colossoma macropomum) tertinggi dan feed cost per gain terbaik diperoleh pada perlakuan pakan komersial E yang memiliki protein sebesar 31,68%., The success of intensive cultivation is determined by the quality of feed. Feed contributes greatly to production costs up to 60-80%. This study aimed to compare the effect of five different commercial feed products on the growth and production performance of tambaqui (Colossoma macropomum) reared in floating net cages in Cirata Reservoir. This study used five product commercial feeds, namely commercial feed A with protein content (28.11%), commercial feed B (28.56%), commercial feed C (26.33%), commercial feed D (28.11%), and commercial feed. E (31.68%). Fish with an initial size of 10±0.1 g were kept in floating net cages measuring 7 m × 7 m × 3.5 m with a stoking density of 24 fish/m for 83 days with the frequency of feeding twice a day, at 08.0˗ 009.00 and 16.00-17.00 with ad satiation. The results showed that feed E with a protein content of 31.68% gave the highest final biomass value, average weight, daily growth rate, protein retention, and fat retention, as well as the lowest feed cost per gain and feed conversion value compared to the other five treatments. Based on the results of this study, it can be concluded that the highest growth and production performance of tambaqui (Colossoma macropomum) and the best feed cost per gain were obtained in commercial feed treatment E which has a protein of 31.68%.
Keyword: ikan bawal, keramba jaring apung, komersial, pakan, pertumbuhan

Judul: The Exploration of Discrete Logarithm over Finite Field GF(3m)
Abstrak: The security of many public~key algorithms is based on the problem of finding discrete logarithms. The generalized discrete logarithm problem is the following: given a finite cyclic group G of order n, a generator a of G, and an element fl E G, find the integer x, 0 ~ x ~ n - 1, such that 0: = fl. Algorithm for discrete logarithm problem focused on Menezes et al. (1997) that consist of exhaustive search algorithm, the baby-step giant-step algorithm, Pollard's rho algorithm, Pohlig-Hellman algorithm, and index-calculus algorithm. These algorithms are explorated to be used in discrete logarithm problem over finite field GF(3m ). The exploration also produces some algorithms, i.e. naif negative algorithm, baby-step mother-step algorithm, baby-step mother free-step algorithm, and baby-step free-step algorithm. All algorithms implemented using Maple 11. The Pohlig-Hellman and baby-step giant-step algorithms are efficient enough to be used in discrete logarithm problem over finite field GF(3m ) for m < 20.
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