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 Kombinasi Pakan Buatan dan Cacing Sutera terhadap Pertumbuhan dan Kelangsungan Hidup pada Benih Ikan Lele Clarias sp. Umur 4 Hari
Abstrak: Catfish hatchery activities still require natural feed which is silk worms. The availability of silk worms in nature are limited to its season. This research is purpose for know influence the feeding combinations artificial feed and silk worms with the different percentage towadrs growth and survival of catfish seed. Seed in the form of larvae of catfish was 4 days with a density of 10 fish/l in a container measuring 20x20x20 cm aquarium. Feed that is given (30-50%) of its average weight each day for 20 days of maintenance. The treatment are silk worms 100% (PA), artificial feed 100% (PB), artificial feed 75% and silk worms 25% (PB75+PA25), artificial feed 50% and silk worms 50% (PB50+PA50), artificial feed 25% and silk worms 75% (PB25+PA75). The results showed that seed catfish fed PB50 + PA50 have the growth of catfish good seed is weights 25+0,01mg, the absolute length of 2,04+0,04cm, the average length of 2,79+0,04cm, coefficient of variability average length 19.95+1,95%, and survival rate 85.55+0,96%.
Keyword: artificial feed, Silk worms, Catfish Clarias sp

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.
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