Judul: Production Performance of Cantik Grouper Nursery in Floating Net Cage with Different Light Intensity
Abstrak: Kanibalisme pada benih ikan kerapu cantik mempengaruhi tingkat kelangsungan hidup, pertumbuhan, produksi dan produktivitas pada pendederan ikan kerapu cantik dalam karamba jaring apung di laut. Kanibalisme pada benih ikan kerapu cantik salah satunya dipengaruhi oleh intensitas cahaya. Penelitian ini bertujuan menganalisis pengaruh perbedaan intensitas cahaya terhadap kinerja produksi pendederan ikan kerapu cantik dalam karamba jaring apung di laut. Benih ikan kerapu cantik dengan panjang 8 cm dan bobot 11,3 g dipelihara dalam kantong waring berukuran 1 m × 1 m × 1 m dalam karamba jaring apung dengan padat tebar 50 ekor/m3 dan penggunaan paranet. Benih diberi pakan buatan berupa pelet berukuran 4 mm yang mengandung protein sebesar 37% secara at satiation antara pukul 07.00 hingga 16.00 WIB. Perlakuan satu lapis paranet menunjukkan hasil pertumbuhan, rasio konversi pakan dan produktivitas tertinggi pada pendederan ikan kerapu cantik dalam karamba jaring apung di laut., Cannibalism in cantik grouper fish fry affects survival rate, growth, production and productivity in cantik grouper fish breeding in floating net cages at sea. Cannibalism in cantik grouper fish fry is influenced by light intensity. This study aims to analyze the effect of different light intensities on the production performance of cantik grouper fish breeders in floating net cages at sea. Cantik grouper fry with a length of 8 cm and a weight of 11.3 g were reared in 1 m × 1 m × 1 m mesh bags in floating net cages with a stocking density of 50 fish/m3 and the use of paranet. The fry were fed with artificial food in the form of 4 mm pellets containing 37% protein by at satiation between 7:00 am and 4:00 pm. The one-layer paranet treatment showed the highest growth, feed conversion ratio and productivity results in cantik grouper breeding in floating net cages at sea.
Keyword: intensitas cahaya, kelangsungan hidup, kerapu, pendederan

Judul: Performance of Production and Nursery Business of  Cantik Grouper in Floating Net Cages (FNC) with Differences in Stocking Density
Abstrak: Padat tebar dapat memengaruhi sintasan dan laju pertumbuhan ikan, sehingga memengaruhi kinerja produksi dan usaha pendederan ikan. Penerapan padat tebar yang optimal dapat meningkatkan kinerja produksi dan usaha pendederan ikan kerapu. Penelitian ini bertujuan mengevaluasi jumlah padat tebar pada pendederan benih ikan kerapu cantik dalam keramba jaring apung, terhadap kinerja produksi dan kinerja usaha. Metode penelitian menggunakan rancangan acak lengkap (RAL) dengan perlakuan padat tebar yaitu padat tebar 50 ekor/m² (A), 75 ekor/m² (B), dan 100 ekor/m² (C). Benih ikan kerapu cantik berukuran 8,6±0,17 cm dipelihara dalam KJA berukuran 1 m x 1 m x 1 m diberi pakan pelet berprotein 48% dengan frekuensi 3 kali sehari secara at satiation selama 40 hari. Hasil penelitian ini menunjukkan bahwa perlakuan C memberikan kinerja produksi terbaik dengan tingkat kelangsungan hidup 97%; pertumbuhan panjang 3,24; rasio konversi pakan 2,37; laju pertumbuhan panjang spesifik sebesar 0,82±0,09 %/hari; dan laju pertumbuhan panjang mutlak sebesar 0,08±0,01 cm/hari sehingga menghasilkan kinerja usaha terbaik dengan keuntungan sebesar Rp.171 935 292 per tahun.
Keyword: cantik grouper, FNC, nursery, stocking density

Judul: Utilization of terra/MODIS L1B data for analysis of horizontal wind profile in the troposphere
Abstrak: This study was concerned with horizontal wind derived from data collected with the Moderate-resolution Imaging Spectroradiometer (MODIS) on board the NASA’s Earth Observation System (EOS)-Terra satellite. The aim of this study is to develop a method for the estimation of horizontal wind movement in the troposphere based on Navier-Stokes equation. The method was applied to a calibrated and geolocated Terra/MODIS L1B 1 km data set. The data inputs to estimate surface temperature are retrieved from TIR (Thermal Infrared) bands 31 (10.780 μm to 11.280 μm) and 32 (11.770 μm to 12.270 μm). The obtained surface temperatures were later used to approximate geopotential height on a constant-pressure surface by using the modified Poisson equation. The main assumptions used are the hydrostatic equilibrium, ideal gas law, constant lapse rate and constant acceleration of gravity. Based on the distribution of geopotential height, the pressure gradient force is measured by the gradient of geopotential on an isobaric coordinate to present the horizontal wind profile. For certain topographic areas especially in the mountain ranges, there was a disadvantage of using pressure as a vertical coordinate which lead to inaccuracy. In spite of that, Terra/MODIS L1B data with 1 km spatial resolution can be used to estimate the horizontal wind movement in the troposphere.
Keyword: