Judul: Cannibalism rate and production performance of cantang grouper nursery in floating net cages with multilevels shelter
Abstrak: Tingkat kanibalisme yang tinggi pada pendederan kerapu cantang disebabkan oleh tingginya frekuensi pertemuan antar ikan. Hal ini dapat diatasi dengan menggunakan selter bertingkat pada wadah. Tujuan penelitian ini adalah mengetahui pengaruh selter bertingkat terhadap tingkat kanibalisme dan kinerja produksi pendederan kerapu cantang pada karamba jaring apung di laut. Perlakuan yang digunakan adalah jumlah tingkat yang berbeda, yaitu perlakuan K (tanpa selter) sebagai kontrol, A (2 tingkat, dasar + 1 tingkat), dan B (3 tingkat, dasar + 2 tingkat). Benih ikan ditebar sebanyak 100 ekor/m3 pada wadah jaring high density polyethylene berukuran 1 × 1 × 1 m3 (MS: 5 mm) dan diberi pakan sebanyak 4 kali sehari secara at satiation selama 30 hari. Hasilmenunjukan adanya pengaruh positif dengan adanya selter bertingkat terhadap tingkat kanibalisme dan kinerja produksi. Hasil terbaik diperoleh pada perlakuan B dengan tingkat kanibalisme sebesar 32,67%, tingkat kelangsungan hidup sebesar 67,33%, laju pertumbuhan panjang dan bobot sebesar 0,174 cm/hari atau 2,57%/hari dan 0,547 g/hari atau 8,09%/hari, rasio konversi pakan sebesar 1,09, High rate cannibalism in cantang grouper nursery are caused by high frequency of fish fingerling encounters. This problem can be solved by using multilevel shelter in cage. The aim of this study was to find out the influence of multilevel shelter on cannibalism rate and production performance of nursery cantang grouper in sea floating net cage. The treatment which has been used is K (without shelter) as a control, A (two levels, base + 1 level), and B (three levels, base + 2 levels). Fish fingerling are stocked as much as 100 fish/m3 in floating net cage made of high-density polyethylene with 1 × 1 × 1m3 (MS: 5 mm) and feeded as much as 4 times a day as fully as needed for 30 days. The results show that there is a positive influence with the existence of multilevel shelters on cannibalism rate and production performance. The best results were obtained in treatment B with a cannibalism rate is 32.67%, survival rate is 67.33%, growth rate of length and weight are 0.174 cm/day or 2.57%/day and 0.547 g/day or 8.09 %/day, and feed conversion ratio is 1.09
Keyword: cannibalism, cantang grouper, multilevel shelter, nursery, production performance

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: 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: