Judul: Pengaruh Suplementasi Selenium dan Vitamin E terhadap Pertumbuhan, Kelangsungan Hidup, dan Kandungan Lemak Tubuh Ikan Gurami (Osphronemus gouramy Lac.)
Abstrak: Penelitian ini bertujuan untuk mengevaluasi potensi pemberian suplemen autioksidan alalni selenium dan vita& E pada ransum ikan gurami (Osphronemus gouramy Lac.) dalam upaya meniugkatkau produksi dan memperbaiki kualitas rlutlisioual dagiug ikau gurami yang dibudidayakan. Aspek penelitian meliputi peugaruh pemberian kombinasi kedua suplemen tersebut terhadap kandungan selenium dagiug ikan, kandungan vitamin E dagiug ikau, kandungan dan komposisi asam lemak daging ikan, laju pertumbuhan, efisiensi pakan serta tingkat kelangsungan hidup (survival rate). Sebagai parameter penuujang diukur kualitas media selama masa pemeliharaan ikan uji.
Keyword: 

Judul: Meta Analisis Suplementasi Selenium pada Pakan Ikan Air Tawar
Abstrak: Penambahan feed supplement pada pakan sangat penting dalam meningkatkan metabolisme tubuh dan sistem imun organisme akuatik. Salah satu jenis feed supplement yang dapat digunakan yaitu mineral selenium. Penelitian ini bertujuan untuk menganalisis dan mengevaluasi berbagai data suplementasi selenium pada pakan ikan air tawar melalui meta analisis. Data yang digunakan dalam penelitian ini berupa data sekunder yang diperoleh melalui database literatur, yaitu Science Direct (https://www.sciencedirect.com/) dan Wiley Online Library (https://onlinelibrary.wiley.com/). Sebanyak 27 referensi dengan 125 unit perlakuan memenuhi syarat untuk dianalisis. Data menjadi sasaran meta-analisis berdasarkan metodologi model campuran (mixed effect model) yang mempertimbangkan dosis selenium sebagai efek tetap dan studi yang berbeda sebagai efek acak. Berdasarkan metode statistik meta analisis yang digunakan maka diperoleh persamaan regresi linier dan kuadratik, suplementasi selenium pada pakan ikan air tawar menghasilkan peningkatan terhadap bobot akhir, PBT (pertambahan bobot tubuh), JKP (jumlah konsumsi pakan), dan REP (rasio efisiensi protein) yang signifikan (P<0,05). Pengaruh suplementasi selenium pada pakan menunjukkan tren positif pada parameter pertumbuhan. Kemudian aktivitas enzim GPx pada organ hati serta kandungan hemoglobin dan HDL yang meningkat dalam darah ikan menunjukkan nilai yang lebih tinggi secara signifikan (P<0,05) terhadap ikan kontrol dengan tren positif. Namun, suplementasi selenium dapat menurunkan kandungan globulin, LDL dan kolesterol dengan signifikan (P<0,05). Penelitian ini menyimpulkan bahwa suplementasi selenium organik pada kisaran 0,60 hingga 7,32 mg/kg pakan dapat meningkatkan kesehatan dan pertumbuhan ikan air tawar., The use of a selenium-based feed supplement is essential for increasing the body metabolism and the immune system of aquatic organisms. This study aims to analyze and evaluate various data on selenium supplementation in freshwater fish feed by meta-analysis. The data used in the study were secondary data obtained from the literature database, specifically Science Direct (https://www.sciencedirect.com/) and Wiley Online Library (https://onlinelibrary.wiley.com/). A total of 27 references containing 125 treatment units were found eligible for analysis. The data were subjected to a meta-analysis utilizing a mixed-effect model methodology that considered selenium dose as a fixed factor and different studies as a random variable. Using linear and quadratic regression equations, selenium supplementation in freshwater fish feed resulted in the significantly increased FBW (final body weight), WG (weight gain), FI (feed intake), and PER (protein efficiency ratio) (P<0,05). The effect of selenium supplementation to feed showed a positive trend on these growth parameters. Then, the activity of the GPx enzyme in the liver and the increased hemoglobin, globulin, and HDL content in the blood of fish exhibited a favorable trend with significantly higher value (P<0,05) compared to control fish. However, selenium supplementation could significantly reduce LDL and cholesterol levels (P<0,05). This study concluded that organic selenium supplementation in the range of 0,60 to 7,32 mg/kg feed could improve freshwater fish’s health and growth.
Keyword: Freshwater Fish, Growth, Health Status, Meta-Analysis, Selenium

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.
Keyword: