Judul: Jumlah Konsumsi Pakan Udang Galah Macrobrachium rosenbergii yang Diberi Pakan dengan Jenis Atraktan Berbeda.
Abstrak: The addition of attractants is expected to give positive correlations to the amount of feed taken and the growth of the shrimp. The purpose of this study was to determine the best attractant of three different sources squid meal, small shrimp meal and shrimp paste in order to stimulate the appetite of the shrimps. The experiments were performed using 8 units of aquariums sized 100x50x35 cm3 with stocking density of 10 shrimps/aquarium. Design used in this study was completely randomized design with three treatments of attractants addition on commercial feed in duplicaty. As much as 2% of squid meal, 2% of small shrimp meal, and 2% of shrimp paste was added to the commercial feed of each treatment using re-pelleting method while commercial feed without addition of attractants was used as the control diet. Feed test was given using at satiation method. The results showed that the best treatment of this study was the addition of 2% of shrimp paste which showed total feed consumption of 56.11±1.54 gram which could be concluded that it could be used as attractant for giant freshwater prawn feed.
Keyword: Macrobrachium rosenbergii., total feed consumption, attractant

Judul: Pengaruh pemberian ransum berkadar protein 40 persen dengan berbagai tingkat energi terhadap pertumbuhan juvenil udang galah ( Macrobrachium rosenbergii de Man )
Abstrak: Penelitian ini bertujuan untuk mengetahui kandungan energi metabolisme yang tepat dalam ransum berkadar protein 40 % untuk menunjang pertumbuhan udang galah (Macrobrachium rosenbergii de Man) secara maksimum. Penelitian ini dilaksanakan di Kolam Percobaan Budidaya Perairan, Fakultas Perikanan Institut Pertanian Bogor di Dar- maga, sejak tanggal 1 April sampai 10 Juni 1988. Udang yang digunakan adalah juvenil udang galah dengan bobot awal 44.95 53.92 miligram per ekor. Wadah pemeliharaan berupa akuarium kaca sebanyak 12 buah dengan ukuran 60x50x40 cm³. Kedalaman air dipertahankan 25 cm. Pada setiap wadah digunakan filter sistem double bottom. Padat penebaran sebesar 25 ekor per wadah. Pemberian makanan dilakukan dua kali sehari sebanyak 8 % dari bobot biomas. Makanan diberikan pada pukul 08.00 sebanyak 2 % dan pukul 16.00 sebanyak 6 % dari bobot biomas. Penyesuaian jumlah makanan yang diberikan dilakukan setiap sepuluh hari sekali sesudah penimbangan udang. Rancangan percobaan yang digunakan adalah Rancangan Acak Lengkap dengan 4 perlakuan dan 3 ulangan. Perlakuan yang diberikan adalah perbedaan kandungan energi metabolisme yang berbeda dalam ransum berkadar protein 40 persen masing-masing sebesar 253.18; 272.70; 321.17 dan 355.56 kkal/100 gram ransum. Hasil uji analisis ragam menunjukkan bahwa kandungan energi metabolisme yang berbeda dalam ransum berkadar protein 40 % memberikan pengaruh yang sama terhadap laju pertumbuhan harian individu, konversi makanan dan tingkat kelangsungan hidup yang masing-masing nilainya untuk perlakuan A (3.16; 2.38; 94.67), perlakuan B (3.09; 2.19; 100.00), perlakuan C (3.23; 2.27; 94.67) dan perlakuan (3.15; 2.26; 97.33) D Dari hasil penelitian ini dapat disimpulkan bahwa ransum berkadar protein 40 % memerlukan imbangan energi metabolisme sebesar 253.18 kkal/100 gr ransum (PE ratio 1: 6.33).
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Judul: : Persamaan Tunggal sebagai Representasi Kurva Komposit
Abstrak: A mathematical method is introduced to represent a composite curve based on an extension of analytic geometry. The representation is given either with a single equation or with two equations, in the case of parametric representation. This method permits the representation of composite curves in similar manner to the conventional representation of non-composite curves. Some mathematical tools, including Heaviside unit step function and periodizer function, are used in the establishment of a single equation. In this paper, regular equations of regular and irregular polygon, as well as composite curves of two dimensions, are implemented using a computer algebraic system, Mathematica.
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