Judul: The Influence of 5-Hydroxytryptophan Administration in Commercial Feed  with Different Doses on Cannibalism of Catfish Fry (Clarias sp.)
Abstrak: Kanibalisme pada benih ikan lele menjadi permasalahan serius yang menyebabkan tingginya tingkat mortalitas. Tujuan penelitian ini adalah untuk mengevaluasi efektivitas pemberian 5-Hydroxytryptophan (5-HTP) dalam mengurangi kanibalisme pada benih ikan lele. Metode eksperimen dilakukan dengan empat taraf dosis 5-HTP yang berbeda. Hasil penelitian menunjukkan bahwa pemberian 5-HTP pada pakan berhasil mengurangi kanibalisme tipe I sebesar 16,66% dan meningkatkan tingkat kelangsungan hidup sebesar 28,33%. Kinerja pertumbuhan benih ikan lele dalam perlakuan dengan pemberian 5-HTP pada pakan menunjukkan nilai yang lebih rendah dibandingkan dengan perlakuan kontrol, namun tidak berbeda signifikan. Hal ini disebabkan oleh dampak lain dari pemberian 5-HTP pada pakan yaitu penekanan nafsu makan. Selama penelitian, kualitas air tetap dalam kisaran standar dan tidak ada perbedaan yang signifikan dalam kualitas air antar perlakuan. Implikasi dari penelitian ini adalah bahwa pemberian 5-HTP pada pakan dapat mengurangi tingkat kanibalisme dan meningkatkan tingkat sintasan hidup dengan dosis terbaik yang ditemukan adalah 10 µg/g berat ikan., Cannibalism in catfish fry has become a serious problem resulting in high mortality rates. The aim of this study was to evaluate the effectiveness of administering 5-Hydroxytryptophan (5-HTP) in reducing cannibalism in catfish fry. The experimental method was conducted with four different doses of 5-HTP. The results showed that the administration of 5-HTP in the feed successfully reduced type I cannibalism by 16,66% and increased survival rates by 28,33%. The growth performance of catfish fry in treatments with 5-HTP in the feed showed lower values compared to the control group, although not significantly different. This was due to other effects of administering 5-HTP in the feed, namely the suppression of appetite. Throughout the study, water quality remained within standard ranges, with no significant differences in water quality between treatments. The implications of this study are that the administration of 5-HTP in the feed can reduce cannibalism and increase survival rates, with the optimal dose found to be 10 µg/g body weight of fish.
Keyword: Kanibalisme, lele, pertumbuhan, 5-HTP, sintasan

Judul: The effect of giving the hormone serotonin in feed in suppressing level of cannibalism in catfish (Clarias sp.)
Abstrak: Ikan lele (Clarias sp.) adalah komoditas perikanan air tawar banyak dibudidaya karena pertumbuhan yang cepat, toleransi terhadap fluktuasi kualitas air dan tahan penyakit. Peningkatan produksi ikan lele harus disertai dengan peningkatan produksi benih. Permasalahan yang terjadi dalam kegiatan pembenihan ikan lele adalah kanibalisme pada benih ikan lele ukuran 3–9 cm. Kanibalisme merupakan aktivitas membunuh dan mengkonsumsi seluruh atau sebagian dari individu sejenis. Penelitian ini bertujuan untuk mengkaji pengaruh hormon serotonin pada pakan dalam menekan tingkat kanibalisme pada ikan lele. Penelitian ini dilakukan dengan empat perlakuan dengan tiga ulangan yaitu, kontrol, P1 (serotonin 0,75 mg/kg pakan), P2 (serotonin 1 mg/kg pakan), P3 (serotonin 1,25 mg/kg pakan). Ikan lele berukuran 3–4 cm dipelihara selama 30 hari pada kontainer berukuran 60x40x40 cm dengan ketinggian air ±20 cm dan padat tebar 2 ekor per liter. Pemberian pakan dilakukan secara ad satiation sebanyak 3 kali sehari pada pukul 08.00, 14.00, dan 20.00 WIB. Parameter yang diamati meliputi kelangsungan hidup, total kanibalisme, tipe kanibalisme, dan kinerja pertumbuhan. Pemberian serotonin berpengaruh nyata terhadap penurunan tingkat kanibalisme pada benih ikan lele, dosis terbaik yaitu pemberian serotonin sebanyak 1,25 mg/kg pakan yang dapat menurunkan kanibalisme tipe I sebesar 77% pada benih ikan lele berukuran 3–4 cm., Catfish (Clarias sp.) is a freshwater fishery commodity that is widely cultivated because of the growth is relatively fast, tolerance to fluctuations of water quality, and quite resistant to disease. The increase in catfish production must be accompanied by an increase in seed production. The problem that occurs in catfish hatchery activities is cannibalism in catfish seeds. Cannibalism is the activity of killing and consuming all or part of an individual of the same species. This research aims to determine the effect of the hormone serotonin in feed in suppressing the level of cannibalism in catfish. This research was carried out by four treatments with three replications, namely, control, P1 (0.75 mg serotonin/kg feed), P2 (1 mg serotonin/kg feed), P3 (1.25 mg serotonin/kg feed). The 3–4 centimeters of catfish were kept in container measuring 60x40x40 cm with water height ±20 cm and density 2 seeds per liter. Feeding is carried out for three times a day with ad satiation method on 08.00 am, 14.00 pm, and 20.00 pm. Parameters observed included survival, total cannibalism, type of cannibalism, and growth performance. Providing serotonin has a significant effect on reducing the level of cannibalism in catfish fry with the best dose at 1.25 mg serotonin/kg feed That can decrease type I cannibalism by 77%.
Keyword: Benih Ikan Lele, Kanibalisme, Pakan, Serotonin, Agresivitas

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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