Judul: Produktivitas Pendederan Ikan Pink Tail Characin Ukuran ¾ inci dengan Sistem Pergantian Air Setiap Hari
Abstrak: The study was aimed to determine the water exchange proportion to achieve optimalize seed productivity of pink tail characin fish rearing. The average size of fish was 2.37 cm or weight of 0.03 ± 0.01 g/fish. The fish were reared at density of 2 fish/L in each aquariums at volume of 100 liters. The treatments consisted of exchange water at proportion of 25%, 50%, 75%, and 100% per day with 3 replicates. The results showed the highest survival rate, average length and daily growth rate of 75% exchange water treatment that were 99.83±0.29%, 2.75±0.02 cm, and 3.98±0.12% respectively. The highest length coefficient of diversity, feed efficiency and economic benefit were obtained by daily exchange water at proportion of 75% these were 4.79±0.19%, 12.12±0.19% and Rp 985 417.- respectively. The optimal rearing productivity of ornamental fish pink tail characin size ¾ inch was in the 75% of daily water exchange proportion.
Keyword: water exchanges, stocking density, seed productivity, Pink tail characin

Judul: Performance of Production and Business on Cardinal  Tetra Fish Grow-out in Different Water Replacement Percentages per Week
Abstrak: Ikan cardinal tetra (Paracheirodon axelrodi) merupakan salah satu jenis ikan hias air tawar yang banyak diminati dan memiliki peluang pasar yang bagus. Kualitas air yang optimal akan mendukung usaha budidaya ikan cardinal tetra. Salah satu cara untuk memperbaiki kualitas air selama masa pemeliharaan dengan menerapkan sistem pergantian air. Penelitian ini bertujuan untuk menganalisis kinerja produksi ikan cardinal tetra dengan persentase pergantian air per minggu yang berbeda. Rancangan penelitian yang digunakan yaitu rancangan acak lengkap dengan tiga perlakuan dan tiga ulangan. Ketiga perlakuan adalah pergantian air sebanyak 20% (A), pergantian air sebanyak 35% (B), dan pergantian air sebanyak 50% dari volume total air pemeliharaan per minggu (C). Ukuran ikan cardinal tetra yang ditebar adalah ikan yang berukuran small-medium (SM) dengan panjang rata rata 1,72±0,10 cm dan bobot rata-rata 0,16±0,02 g dan ditebar sebanyak 5 ekor/L. Ikan dipelihara selama 28 hari dan diberi pakan berupa pakan buatan komersial dengan metode at satiation. Hasil penelitian menunjukkan bahwa persentase pergantian air sebanyak 50% menghasilkan kinerja produksi terbaik berupa tingkat kelangsungan hidup 93,80±0,60% dan laju pertumbuhan mutlak panjang 0,0410±0,0009 cm/hari. Perlakuan tersebut juga memberikan kinerja usaha terbaik dengan menghasilkan harga pokok produksi sebesar Rp606,00, payback period 0,87 tahun dan R/C 1,27., The cardinal tetra fish (Paracheirodon axelrodi) is one of the popular freshwater ornamental fish species that has good market potential. Optimal water quality will supports the culture of cardinal tetra fish. One way to improve water quality during the culture period is by implementing a water exchange system. This research was aimed to analyze the production performance of cardinal tetra fish reared at different weekly water exchange percentage. The research design used was a completely randomized design with three treatments in triplicates. The three treatments consisted of 20% (A), 35% (B), and 50% of exchange water of the total water volume per week (C). The stocking size of the cardinal tetra fish was small medium (SM) with an average length of 1.72 ± 0.10 cm and an average weight of 0.16 ± 0.02 g, at a density of 5 fish/L. The fish were reared for 28 days and fed with commercial pellets using the at satiation method. The results showed that a 50% water exchange percentage resulted in the best production performance, including a survival rate of 93.80 ± 0.60% and absolute growth rate of 0.0410±0.0009 cm/day. This treatment also provided the best economic performance with a production cost of Rp606.00, a payback period of 0.87 years and a R/C of 1.27.
Keyword: culture, paracheirodon axelrodi, performance of business, performance of production, water changes

Judul: Pencarian Masjid Terdekat dengan Location Based Service (LBS) pada Android
Abstrak: When in a trip, a Muslim who wants to pray in the mosque timely, need the nearest mosque information. Such information can be provided through location based services (LBS). LBS consists of application components, component acquisition positions, mobile device, telecommunication networks, and service server. This research has successfully developed Android application that is able to provide the nearest mosque’s information and the mosque’s route on Google Maps. The application uses the acquisition component positioning using assisted global positioning system (A-GPS) in mobile devices. The mobile device used is a smart phone with Android operating system. Then, the telecommunications network uses global system for mobile communications (GSM) network or code division multiple access network (CDMA) network. Service server as content provider on the application is available through three Google API services: Google Maps API as the provider of maps, Google Place API as provider of mosque data, and Google Direction API as provider route to the mosque with the driving mode.
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