Judul: Efektivitas Penggunaan L-Triptofan Melalui Pakan dalam Penekanan Karakter Kanibalisme Benih Ikan Lele (Clarias sp.)
Abstrak: Ikan lele (Clarias sp.) adalah ikan air tawar yang banyak dikonsumsi oleh masyarakat dengan jumlah permintaan yang kunjung meningkat. Dalam memenuhi kebutuhan konsumsi itu, dibutuhkan kegiatan budidaya yang mampu meningkatkan produktivitasnya. Akan tetapi, pembudidaya ikan lele menghadapi beberapa masalah sifat kanibalisme yang dapat dilihat sejak ikan masih berupa benih, yang disebabkan oleh hormon testosteron. Upaya yang dapat dilakukan dalam menekan kanibalisme dengan memberikan triptofan, yang dicampurkan pada pakan. Tujuan dari penelitian ini adalah untuk menguji efektivitas triptofan dalam pengendalian kanibalisme pada benih ikan lele. Penelitian ini menggunakan metode rancangan acak lengkap (RAL) yang terdiri atas 3 (tiga) perlakuan dengan masing-masing 4 (empat) ulangan. Perlakuan tersebut adalah pemberian triptofan dengan dosis 0,25%/kg pakan, 0,50%/kg pakan, 1%/kg pakan, serta perlakuan tanpa penambahan triptofan (kontrol). Benih ikan berukuran 3,92±0,13 cm dipelihara selama 30 hari dengan kepadatan 200 ekor di dalam wadah dan diberi pakan sebanyak 3 kali sehari sebanyak 5%. Pemberian triptofan pada pakan memberikan pengaruh nyata terhadap penekanan kanibalisme dengan dosis pemberian terbaik pada pemberian triptofan sebanyak 0,25%., Catfish (Clarias sp.) is a freshwater fish that is widely consumed by the community with an increasing number of requests. In meeting the consumption needs, aquaculture activities are needed that can increase productivity. However, catfish aquaculture faces several problems one of which is the cannibalism that can be seen since the fish are still in the form of fry, which is caused by a testosterone hormone. Efforts can be made to suppress cannibalism by giving tryptophan mixed with diet. This study aimed to test the effectiveness of tryptophan in controlling cannibalism in catfish fry. This study used a completely randomized design (CRD) method consisting of 3 (three) treatments with 4 (four) replications each. The treatments were giving tryptophan with a dose of 0,25%/kg diet, 0,50%/kg diet, 1%/kg diet, and treatment without the addition of tryptophan (control). Fish fry measuring 3,92±0,13 cm were reared for 30 days with a density of 200 fish in the container and fed 3 times a day as much as 5%. the addition of tryptophan in the diet had a significant effect on suppressing cannibalism with the best dose of tryptophan given as much as 0,25%/kg diet.
Keyword: cannibalism, catfish fry, diet, tryptophan

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: 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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