Judul: Kombinasi Cacing Sutra Tubifex dan Pakan Buatan pada Pemeliharaan Larva Ikan Patin Pangasius sp.
Abstrak: This research was conducted to evaluate the effect of different combination of feeding frequency of Tubifex (C) and artificial diet (P) on survival rate and growth rate of larval yellowtail catfish Pangasius sp.. Newly hatched larvae (d0) with total length of 0.44±0.04 cm were cultured for 14 days in 30x20x20 cm3 aquarium. Water volume in each aquarium was 9 L. At d5, larvae were fed on five different feeding frequencies either 6C+0PB, 5C+2PB, 3C+3PB, 2C+5PB, dan 0C+6PB. Feeding method used in this research was ad libitum. Results showed that survival rate and total length of d14 old larvae fed on 0C+6PB was lower than the groups fed on either 6C+0PB or three combinations of C+PB. Lipase activity tend to be increase in line with the increasing amount of artificial feed. On the other hand, larvae fed on 6C+0PB and 0C+6PB had the lowest protease activity. Therefore, larval catfish can be fed by combination of Tubifex and artificial feed.
Keyword: yellowtail catfish larva Pangasius sp., silkworm, protease activity, lipase activity, Artificial diet

Judul: Pemberian Pakan Campuran pada Larva Ikan Patin
Abstrak: Artemia as live feed of stripped catfish larvae has a high price and tend to increase in time. The objective of this research is to find out the most optimum combination of artemia and compound feeding for stripped catfish larva survival and growth. Five thousand catfish larvae were stocked in glass aquarium with the size 90x40x40 cm3 and 50 larvae in glass aquarium 20x10x15 cm3. Combination feeding experiment consisted of 77.19 g artemia as a control; 77.19 g of artemia and 27 mL of compound feed (treatment I); 57.89 g of artemia and 33.75 mL of compound feed (treatment II); and 38.59 g of artemia and 40.5 mL of compound feed (treatment III). Survival rate of larvae on day 3th was 71.67%; 60.00%; 65.00%; and 31.25% respectively. While larva survival on 18 days was 50.27%; 34.50%; 53.33%; and 31.23% respectively. During the three days of experiment on survival, treatment III showed significanly lower survival. Absolute larvae length on 3 days experiment was 0.69 cm; 0.70 cm; 0.64 cm; and 0.59 cm respectively. Absolute larvae length the treatment was not significanly diffirent from each other, except for treatment III. Absolute larvae length in 18 days experiment was 1.52 cm; 1.40 cm; 1.51 cm; and 1.42 cm respectively. Combination of artemia and compound feed had an effect on survival rate. Compound feed could not totally replace artemia as a live feed, however it can be used as a complement feed.
Keyword: 

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: