Judul: Pengkayaan pakan alami Moina sp. dengan glutamin untuk meningkatkan kinerja pertumbuhan larva ikan baung Hemibagrus nemurus.
Abstrak: baung (Hemibagrus nemurus) melalui pengkayaan pakan alami Moina sp. menggunakan glutamin. Pemberian pakan selama 40 hari yang terdiri atas 20 hari pemberian Moina sp. yang diperkaya glutamin dan selanjutnya diberi cacing sutera Tubifex sp.. Larva diberi pakan secara ad libitum. Larva yang digunakan memiliki bobot dan panjang awal berturut-turut 0,03±0,007 g ekor-1 dan 1,30±0,09 cm ekor-1. Larva disebar secara acak dengan padat tebar 5 ekor L-1 dalam kontainer plastik (ukuran 40x25x15 cm) yang diisi air dengan volume 10 L. Penelitian yang dilakukan mengikuti rancangan acak lengkap dengan 5 perlakuan (0 mg L-1 glutamin, 25 mg L-1 glutamin, 50 mg L-1 glutamin, 75 mg L-1 glutamin, dan 100 mg L-1 glutamin) dan 3 ulangan. Hasil penelitian menunjukkan: pertambahan panjang 3,45 cm, pertambahan bobot 0,98 g, laju pertumbuhan harian 9,23% hari-1, dan rasio panjang usus 0,67 tertinggi dengan kelangsungan hidup 100%. Pengkayaan pakan alami Moina sp. dengan glutamin dosis 50 mg L-1 meningkatkan kinerja pertumbuhan larva ikan baung tertinggi dibandingkan dengan perlakuan lainnya.
Keyword: baung, glutamin, kinerja pertumbuhan

Judul: Evaluasi pengkayaan pakan alami Moina sp. dengan mineral Zn dan glutamin terhadap perkembangan larva dan pertumbuhan benih ikan gurame (Osphronemus goramy).
Abstrak: Ikan gurame Osphronemus goramy merupakan salah satu komoditas ikan air tawar yang memiliki nilai ekonomis yang tinggi dan permintaan yang terus meningkat. Masalah yang ditemukan pada budidaya ikan gurame adalah pertumbuhannya yang lambat. Penelitian ini bertujuan untuk mengevaluasi pengkayaan Moina sp. dengan mineral Zn, glutamin dan kombinasi keduanya terhadap kinerja pertumbuhan larva ikan gurame (Osphronemus goramy). Wadah pemeliharaan menggunakan 16 akuarium berukuran 30x30x30 cm3 dengan volume 18 liter. Penelitian ini menggunakan rancangan acak lengkap dengan empat perlakuan dan empat pengulangan. Perlakuan pada penelitian ini yaitu Zn0Glu0 (control) dengan 0 mg Zn L-1 dan 0 mg glutamin L-1 , Zn30Glu0 dengan 30 mg Zn L-1 dan 0 mg glutamin L-1, Zn0Glu50 dengan 0 mg Zn L-1 dan 50 mg glutamin L-1, dan Zn30Glu50 dengan 30 mg Zn L-1 dan 50 mg glutamin L-1 pada pengkayaan Moina sp dan diberikan pada 80 ekor larva/akuarium selama 20 hari dengan frekuensi pemberian pakan 5 kali/hari. Hasil penelitian menunjukan larva ikan gurame yang diberi pakan Moina sp. yang diperkaya dengan kombinasi mineral Zn dan glutamin (Zn30Glu50) memberikan pertumbuhan dan kelangsungan hidup tertinggi dibandingkan dengan kontrol. Pemberian Moina sp. yang diperkaya kombinasi mineral Zn dan glutamin dapat meningkatkan kinerja pertumbuhan benih gurame.
Keyword: glutamin, Osphronemus goramy, Moina sp, pengkayaan, Zn

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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