Judul: Aplikasi Prebiotik Madu Randu untuk Meningkatkan Kinerja Pertumbuhan dan Status Kesehatan Benih Ikan Nila yang Dipelihara di Hapa
Abstrak: Salah satu upaya untuk meningkatkan kinerja pertumbuhan dan status kesehatan ikan adalah melalui pemberian prebiotik. Madu randu sebagai sumber prebiotik dengan kandungan oligosakarida berupa FOS 14,76% dan inulin 6,60% telah diketahui dapat menstimulasi pertumbuhan bakteri probiotik untuk meningkatkan kinerja pertumbuhan dan status kesehatan ikan nila. Penelitian ini bertujuan untuk menguji pengaruh pemberian madu randu melalui pakan dalam meningkatkan kinerja pertumbuhan dan status kesehatan benih ikan nila yang dipelihara pada kondisi lapang di hapa. Penelitian ini menggunakan empat perlakuan yaitu kontrol (tanpa prebiotik madu randu) dan penambahan madu randu melalui pakan dengan dosis 0,5%, 0,75% dan 1%. Ikan nila berukuran panjang rata-rata (5,64 ± 0,09) cm dan bobot rata-rata (3,07 ± 0,046) g, dipelihara di hapa ukuran 2x1x1 m dan diberi pakan perlakuan selama 30 hari dengan padat tebar 50 ekor/m3. Parameter yang diamati meliputi pertumbuhan panjang, pertumbuhan bobot, laju pertumbuhan spesifik, jumlah konsumsi pakan, rasio konversi pakan, tingkat kelangsungan hidup, total eritrosit, kadar hemoglobin, kadar hematokrit, total leukosit, aktivitas fagositosis, respiratory burst dan total kelimpahan bakteri di usus ikan nila. Hasil penelitian menunjukkan bahwa pemberian prebiotik madu randu melalui pakan mampu meningkatkan kinerja pertumbuhan dan status kesehatan ikan nila dengan dosis terbaik pada perlakuan prebiotik madu randu 1%.
Keyword: Nile tilapia, bacterial abundance, growth performance, honey, health status

Judul: Application of Randu Honey Prebiotic For  Growth Performance and Immune Responses of Tilapia Infected by Streptococcus  agalactiae
Abstrak: Peningkatan produksi budidaya ikan nila dapat dicapai dengan penerapan sistem budidaya intensif, namun sistem budidaya intensif dapat meningkatkan resiko serangan penyakit. Penyakit utama dalam budidaya ikan nila adalah streptococcosis yang disebabkan oleh bakteri Streptococcus agalactiae. Salah satu upaya yang dapat dilakukan untuk mengatasi masalah tersebut yaitu dengan meningkatkan respons imun menggunakan prebiotik. Penelitian ini bertujuan untuk menguji pengaruh aplikasi prebiotik madu randu dengan dosis yang berbeda terhadap kinerja pertumbuhan dan respons imun ikan nila yang diinfeksi S. agalactiae. Penelitian terdiri atas empat perlakuan yaitu kontrol (tanpa pemberian prebiotik madu randu), prebiotik madu randu 0.5%, 0.75%, dan 1%. Ikan nila merah berukuran 5.64 ± 0.09 cm dipelihara menggunakan hapa di kolam dengan padat tebar 50 ekor m-3 . Ikan diberi pakan pelet komersial yang telah diperkaya prebiotik madu sesuai perlakuan selama 80 hari, kemudian ikan dipindah ke akuarium berukuran 60x30x40 cm³ dengan padat tebar 15 ekor/akuarium dan diuji tantang dengan S. agalactiae. Parameter yang diamati meliputi tingkat kelangsungan hidup, laju pertumbuhan spesifik, rasio konversi pakan, kadar hemoglobin, kadar hematokrit, total eritrosit, total leukosit, aktivitas fagositosis, dan respiratory burst. Hasil penelitian menunjukkan bahwa pemberian prebiotik madu dapat meningkatkan kinerja pertumbuhan dan respons imun ikan nila yang diinfeksi dengan S. agalactiae dengan hasil terbaik pada perlakuan prebiotik madu 1%.
Keyword: Prebiotik, Madu Randu, Oreochromis sp., Streptococcosis, Streptococcus agalactiae

Judul: Thermal Characteristics and Dynamics of Tropical Cyclone over Western North Pacific Ocean: A Case Study of Typhoon Songda (Chedeng) 2011
Abstrak: The frequent occasion of Tropical Cyclone (TC) over Western North Pacific (WNP) Ocean lies from 10˚N to 26˚N and 121˚E to 170˚E. Sources of TC development come from warm ocean temperature where latent heat is released during condensation processes and subsequently concentrated in the boundary layer. Relative humidity at 850-700 hPa is responsible to produce the most intense storm. Meanwhile, weak vertical wind shear between 850-200 hPa is one of the dynamical factors that lead to the development of TC. Pressure level of 850-200 hPa is chosen to minimize the thermodynamic effect in the lower troposphere. Typhoon Songda (Chedeng in the Philippines) or TSC lasted from May 18th to 30th, 2011 and strengthened into powerful Super Typhoon stage between May 24th and 27th. Long curving track and the exhibition of all sequences of TC life cycle, TSC is then considered as an ideal case of TC. The objective of the study with case of TSC is to investigate the role of thermal characteristics and dynamics on TC intensity. The research is carried out by using Advanced Research of Weather Research and Forecasting model (WRF ARW model) version 3.3. Two domains are employed in the model. The first domain situate from 02˚N to 40˚N and 118˚E to 149˚E and cover spatial resolution () of 33.1 km. The second domain situate from 09˚N to 27˚N and 119˚E to 132˚E with of 11 km. Timestep of the model () is 120 seconds. The model is supported by the following physical parameterization, i.e., Yonsei University Scheme (YSU) in the boundary layer, Kain-Fritsch scheme (KF) in the cumulus, and WRF Single-Moment 3-class scheme in the microphysics. Initial meteorological condition prior to the formation of the cyclone is generated using WRF ARW standard-release model. Sensitivity of the model output is obtained from a selected single-parameter change scenarios, namely, 10 % to 20 % decrease and increase of wind shear initial data at 850-200 hPa, and by 10 % to 20 % decrease of relative humidity initial data at 850-700 hPa. The result showed that the negative correlations between wind shear and intensity are found in wind shear scenarios. Wind shears of 10 ms-1 which lead to strengthening of the wind intensity in the early period of Typhoon development are found in wind shear scenarios. The effect of wind shear changes on wind intensity is statistically significant in the 20 % wind shear scenarios. During mature stage, weak wind intensity occurred when wind shear increase as given in the WRF standard-release and the 20 % decreasing scenario. Different situation is found in the 20 % increasing scenario where wind shear tend to weak and lead to strong wind intensity at this stage. Meanwhile, the reduction of moisture supply at 850-700 hPa resulting from 20 % decreasing relative humidity play a major role in the weakening of wind intensity and reduces mechanical energy of the cycle process as much as 300 J kg-1.
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