Judul: Efisiensi hormon oksitosin dan ovaprim pada dosis berbeda dalam pemijahan buatan ikan lele Sangkuriang Clarias sp.
Abstrak: Catfish is a freshwater fish that has a high economic value. Larval production of catfish constantly improved through artificial spawning by injecting hormones. The purpose of this research was to determine the effectiveness and efficiency used of a combination oxytocin hormone and ovaprim on spawning female catfish with a mixture of different doses. The research consist of 5 treatments and 3 replications using complete random design. Treatment consist of P0 (ovaprim 100%), P1 (oxytocin 25% and ovaprim 75%), P2 (oxytocin 50% and ovaprim 50%), P3 (oxytocin 75% and ovaprim 25%) and P4 (oxytocin 100%). The best result showed that P3 or treatment dose of 75% oxytocin hormone and 25% ovaprim injection was the most efficient with an average ovulation time 9 hours 38 minutes and inducing cost Rp. 1 525,00,-.
Keyword: ovaprim., oxytocin, catfish, Hormone

Judul: Effect of giving Oodev and melatonin on reproductive performance of female pearl catfish (Clarias sp.)
Abstrak: Penelitian ini bertujuan mengetahui hasil kinerja reproduksi ikan lele mutiara (Clarias sp.) betina dengan penambahan melatonin dan Oodev melalui pakan. Terdapat enam perlakuan berbeda yaitu K (pakan tanpa Oodev dan melatonin), M1 (pakan dengan melatonin 0,5 mg/kg), M2 (pakan dengan melatonin 1 mg/kg), O (pakan dengan Oodev 0,25 mL/kg), OM1 (pakan dengan Oodev 0,25 mL/kg) dan melatonin 0,5 mg/kg), dan OM2 (pakan dengan Oodev 0,25 mL/kg dan melatonin 1 mg/kg). Ikan lele ukuran 800-1.200 g sebanyak 42 ekor dipelihara di dalam kolam terpal berdiameter 2,5 m dengan tinggi air 100 cm. Ikan diberi pakan dua kali sehari secara restricted dengan feeding rate sebesar 2%. Pengelolaan kualitas air dilakukan dengan cara mengukur kualitas air selama dua minggu sekali. Hasil penelitian menunjukkan bahwa pada semua parameter kinerja reproduksi; indeks gonad, fekunditas, diameter telur, derajat pembuahan, derajat penetasan, tingkat kelangsungan hidup benih, panjang benih dari ikan lele yang diberi pakan bersuplementasi melatonin dan Oodev menunjukkan nilai yang lebih baik dibandingkan dengan perlakuan lainnya (P<0,05). Dosis pemberian Oodev dan melatonin untuk menghasilkan kinerja reproduksi terbaik, yaitu Oodev 0,25 mL/kg dan melatonin 0,5 mg/kg., This study aims to determine the reproductive performance of female pearl catfish (Clarias sp.) with the addition of melatonin and Oodev through feed. There were six different treatments, namely K (feed without Oodev and melatonin), M1 (feed with melatonin 0.5 mg/kg), M2 (feed with melatonin 1 mg/kg), O (feed with Oodev 0.25 mL/kg) , OM1 (feed with Oodev 0.25 mL/kg) and melatonin 0.5 mg/kg), and OM2 (feed with Oodev 0.25 mL/kg and melatonin 1 mg/kg). 42 catfish measuring 800-1,200 g were kept in a tarpaulin pond with a diameter of 2.5 m with a water height of 100 cm. Fish were fed twice a day on a restricted basis with a feeding rate of 2%. Water quality management is carried out by measuring water quality once every two weeks. The results showed that on all parameters of reproductive performance; gonadosomatic index, fecundity, egg diameter, fertilization rate, hatching rate, seed survival rate, seed length of catfish fed with melatonin and Oodev supplementation showed better values than other treatments (P<0.05). The doses of Oodev and melatonin to produce the best reproductive performance were Oodev 0.25 mL/kg and melatonin 0.5 mg/kg. Keywords: catfish seeds, female catfish, melatonin, oodev, reproduction
Keyword: ikan lele, oodev, reproduksi, catfish seeds, female catfish, melatonin, oodev, reproduction

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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