Judul: Kualitas air di dalam dan di sekitar kolam-kolam budidaya ikan nila(oreochromis niloticus) di Kabupaten Sumedang, Jawa Barat
Abstrak: Penelitian ini bertujuan untuk mengidentifikasi kualitas air kolam-kolam pembesaran dan pembenihan ikan nila dalam kaitannya dengan produktivitas ikan dan benih di dalamnya. Serta mengidentifikasi dampak yang ditimbulkan dari air buangan bekas kegiatan budidaya ikan nila terhadap kualitas perairan di sekitarnya. Penelitian ini dilaksanakan di Desa Mulyamekar, Sukamantri, dan Sukatani di Kecamatan Tanjungkerta; Desa Bojongloa, Panyindangan, Buahdua, dan Sekarwangi di Kecamatan Buahdua; Desa Cuggeang Kulon, dan Conggeang Wetan di Kecamatan Conggeang, serta Desa. Girimukti di Kecamatan Sumedang Utara di Kabupaten Sumedang, Jawa Barat, pada bulan Juli - November 2002. Jumlah responden (petani) sebanyak 37 dengan rincian 10 petani ikan pembenihan dan 27 petani ikan pembesaran. Pengambilan contoh air pada kolam pembenihan sebanyak 5 responden sedangkan kolam pembesaran sebanyak 9 responden. Parameter yang diukur secara in situ meliputi luas kolam, kedalaman air, kedalaman substrat, kecepatan arus, debit air, suhu air, suhu udara, kecerahan, daya hantar listrik, tata guna lahan disekitar kolam, pH, oksigen terlarut, kesadahan dan alkalinitas Sedangkan yang diukur di laboratorium meliputi parameter TDS, TSS, TOM, nitrat, nitrit, amonia, total fosfat, kalsium, magnesium, besi dan suifat. Analisis data dilakukan dengan dua pendekatan yaitu membandingkan data kualitas air kolam dengan baku mutu air kelas II (Peraturan Pemerintah Republik Indonesia Nomor 82 tahun 2001) dan penggunaan metode STORET (Storage and Retrieval of Water Quality Data System). Kondisi fisik kolam dan proses pembenihan ikan nila di Kabupaten Sumedang tergolong cukup baik, hal ini dilihat dari proses persiapan kolam sampai pemanenan. Umur induk ikan yang digunakan berkisar antara 8 bulan sampai 2 tahun dengan jumlah produksi berikan berkisar antara 285.714-2.551.020 ekor/ha/tahun. Sedangkan pemasaran berikan nila yang dilakukan petani adalah menjual langsung ke petani lain atau kepada tengkulak ikan.
Keyword: Oreochromis niloticus, Nile tilapia, water quality studies

Judul: Kualitas air pada pemeliharaan ikan nila Oreochromis sp intensif di kolam Departemen Budidaya Perairan Institut Pertanian Bogor
Abstrak: Tilapia Oreochromis sp. is one of the most importants freshwater fish that have a high potential of economic value to be an intensive culture. Water quality management is the major component that must be considered in increasing production. The application of a paddle wheel on aquaculture is used in order to be able to maintain the supply of oxygen, which required for the growth of fish. This study aimed to analyze the effect of water quality parameters on decreased in appetite and body resistance in an intensive culture of tilapia. The study was conducted by taking samples of water at depth ranged from 10 to 30 cm with different distances in pond culture. The samples were taken at 06.00 am and at 02.00 pm. Water quality parameters observed in this study were dissolved of oxygen (DO), temperature, pH, ammonia, and organic matter content. The results of study showed that dissolved of oxygen ranged from 5.5 to 7.6 mg/l; water temperatur ranged from 26.9 to 28.3 °C; pH ranged from 6.85 to 7.68; ammonia ranged from 0.0012 to 0.017 mg/l; and the organic matter content ranged from 11.16 to 38.44 mg/l KMnO4. The values of water quality parameters measured in the range of optimal. Decreased appetite in fish caused by the concentration level of ammonia (NH3) that have almost reached its upper limit and the high concentration of the total organic matter in the water, so that fish are more susceptible to disease. The operation of the paddle wheel was supplied enough of oxygen for aquatic organisms, so that the concentration of dissolved oxygen did not reduced.
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Judul: Penggunaan Trie dalam Membangun Frequent ltemset Menggunakan Algoritmc FPGrowth
Abstrak: FP-growth algorithm search for frequent itemset using the FP-tree data structure which is a prefix tree structure based on pattern growth algorithm. Prefix tree in FP-Growth uses the trie structure in the relationship pattern among the items in the database. Trie is a tree structure that uses strings as key, where each descendant represents a character or prefix. To find frequent itemset, FP-growth algorithm build prefix tree recursively. However, recursive function may need longer time than the Iterative (Manolopoulos 2003). Goal of this research is to create alternatives iteratively to the development of frequent iternset using trie on the FP-Growth. Research was conducted on several stages for the development of the frequent itcmset using a trie, stage through pruning and without pruning. In the last stages of testing is done using the input parameters, enter the difference in support, the number of transactions, and the items involved. Testing stage compare the execution time in the computing process through the stage with pruning and without pruning. Thing that affects the execution time is the number of items involved in development process of the frequent itemset. Frequent itemset development with the pruning process will he faster than without pruning, hecause at the time to build a combination of frequent itemset, infrequent items are not in the development process.
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