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 effectiveness of the use of serotonin on the control of cannibalism of catfish fry (Clarias sp.) through feed
Abstrak: Catfish is one of the commodities that have great potential in freshwater fish farming. Catfish itself is a commonly cultivated fresh water commodity due to its numerous advantages. Consequently, the demand for fish consumption increased in line with population growth. However, there are several problems in catfish hatchery, one of which is the high mortality rate due to cannibalism among catfish fingerlings which results in a lack of fulfillment of catfish supply. Therefore, efforts were made to suppress the level of cannibalism in catfish fry by giving the serotonine hormone through their feed. This study aims to test the effectiveness of the serotonine hormone in controlling cannibalism. This research was conducted in 1 (one) replication using a field scale with two treatments. These treatment included the administration of serotonine at doses of 0.5 mg and 1 mg/kg of feed. The catfish fingerlings used in this study were 14-15 cm in size and were raised for 30 days at a stocking density of 1000 individuals per container. Eeeding was carried out 3 times a day, with ieach feeding consisting of 8% of the total fish weight. The administration of the serotonine hormone significantly reduced cannibalism among catfish fry with the best dose of the hormone serotonin 1 mg/kg of feed., Ikan lele merupakan salah satu komoditas yang memiliki potensi besar dalam budidaya ikan air tawar. Ikan lele merupakan komoditas budidaya air tawar yang banyak dibudidayakan, hal tersebut dikarenakan ikan lele memiliki banyak keunggulan, sehingga permintaan terhadap konsumsi ikan meningkat sejalan dengan peningkatan pertumbuhan jumlah penduduk. Namun, terdapat beberapa permasalahan dalam kegiatan pembenihan ikan lele, salah satunya adalah tingginya mortalitas akibat sifat kanibalisme pada benih ikan lele yang mengakibatkan kurangnya pemenuhan kebutuhan pasokan ikan lele. Maka dari itu dilakukan upaya dalam menekan tingkat kanibalisme pada benih ikan lele dengan pemberian hormon serotonin melalui pakan. Penelitian ini bertujuan untuk menguji tingkat efektifitas hormon serotonin dalam pengendalian kanibalisme. Penelitian ini dilakukan dalam 1 (satu) kali ulangan menggunakan skala lapangan dengan dua perlakuan. Perlakuan tersebut adalah pemberian serotonin dengan dosis 0,5 mg dan 1 mg/kg pakan. Benih ikan yang digunakan pada penelitian ini berukuran 14-15 cm yang dipelihara selama 30 hari dengan jumlah ikan 1000 ekor/ m2 dalam wadah yang terkontrol. Pola pemberian pakan pada tiap wadahnya yakni sebanyak 3 kali sehari sebanyak 8% dari total bobot ikan. Pemberian hormon serotonin berpengaruh nyata terhadap penekanan kanibalisme pada benih ikan lele dengan dosis terbaik pada pemberian hormon serotonin 1 mg/kg pakan.
Keyword: Benih ikan lele, Hormon serotonin, kanibalisme, Pakan

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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