Judul: Pemanfaatan Sargassum sp. Sebagai Bahan Baku Pakan Ikan Gurami Osphronemus goramy
Abstrak: Sargassum sp. merupakan golongan rumput laut coklat (Phaeophyta) yang mempunyai kelimpahan sangat tinggi, terdapat hampir di seluruh Indonesia dan mengandung nutrien yang cukup lengkap. Pemanfaatan dapat dilakukan dengan menambahkannnya ke dalam pakan ikan. Salah satu jenis ikan yang dapat digunakan yaitu ikan gurami. Penelitian bertujuan untuk menentukan jumlah tepung Sargassum sp. yang optimal untuk ikan gurami. Perlakuan yang diuji yaitu penambahan Sargassum sp. sebanyak 0%, 5%, 7,5%, dan 10% ke dalam pakan ikan. Pakan diberikan secara at satiation. Hasil menunjukkan bahwa penambahan Sargassum sp. sebanyak 7,5% mampu memberikan pertumbuhan terbaik dengan memberikan nilai pertambahan bobot 55,43 g, jumlah konsumsi pakan 94,74 g, efisiensi pakan 58,38%, rasio efisiensi protein 1,83, retensi protein 27,09%, retensi lemak 56,19%, laju pertumbuhan spesifik 1,01%, dan kelangsungan hidup 98%. Penambahan Sargassum sp. ke dalam pakan ikan gurami mampu memberikan pertumbuhan yang baik, sehingga Sargassum sp. dapat lebih dimanfaatkan.
Keyword: Sargassum sp., kinerja pertumbuhan, ikan gurami

Judul: Pemanfaatan Rumput Laut Sargassum sp. Sebagai Bahan Baku Pakan Terhadap Pertumbuhan dan Sintasan Ikan Nilem Osteochilus hasselti
Abstrak: Sargassum sp. merupakan jenis rumput laut coklat (Phaeophyta) yang memiliki kelimpahan yang sangat tinggi dan terdapat di sebagian besar wilayah Indonesia. Sargassum sp. memiliki kandungan nutrisi yang cukup baik sehingga dapat dimanfaatkan sebagai bahan baku pakan ikan, salah satunya ikan nilem (Osteochilus hasselti). Penelitian ini bertujuan untuk mengevaluasi pemanfaatan Sargassum sp. sebagai bahan baku pakan terhadap kinerja pertumbuhan dan sintasan ikan nilem. Perlakuan yang diujikan ialah penambahan Sargassum sp. dengan dosis berbeda dalam pakan yaitu 0%, 3%, 6%, 9% dan 12% yang diberikan secara at satiation dan dipelihara selama 45 hari. Hasil menunjukkan bahwa penambahan Sargassum sp. sebanyak 3% mampu memberikan performa pertumbuhan yang lebih baik dengan nilai bobot akhir 184,73 g, jumlah konsumsi pakan 169,87 g, rasio konversi pakan 1,97, laju pertumbuhan spesifik 1,41%, rasio efisiensi protein 1,82, kecernaan protein 92,35%, kecernaan energi 82,26%, kecernaan total 65,94%, indeks hepatosomatik 0,54% dan sintasan 100%. Penambahan Sargassum sp. ke dalam pakan ikan nilem sebanyak 3% mampu memberikan performa pertumbuhan dan nilai sintasan yang baik.
Keyword: Ikan nilem, kecernaan, kinerja pertumbuhan, Sargassum sp.

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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