Judul: Training Rat Grouper (Cromileptes altivelis) to recognize sound to support marine aquaculture
Abstrak: Ikan Kerapu Tikus (Cromileptes altevalis) memiliki prospek yang sangat cerah untuk dibudidayakan karena merupakan salah satu jenis yang memiliki nilai nilai ekonomis tinggi serta memiliki peluang pasar dalam maupun luar negeri yang sangat baik. Conditioning adalah suatu bentuk belajar yang memungkinkan organisme memberikan respon terhadap suatu rangsang yang sebelumnya tidak menimbulkan respon itu, atau suatu proses untuk mengintroduksi berbagai reflek menjadi sebuah tingkah laku. Penelitian ini bertujuan untuk melihat respon Ikan Kerapu Tikus terhadap suatu rangsangan berupa sinyal suara ketika pemberian makan. Tahapan yang dilakukan dalam mendeteksi karakteristik Ikan Kerapu Tikus yaitu penyiapan kolam, aklimatisasi, ketukan besi. Respon ikan terhadap pemberian makan menggunakan ketukan besi. Pada jarak 1 m ikan kerapu tikus akan menghampiri suara ketukan besi selama 8 detik, pada jarak 2 m selama 10 detik ikan kerapu tikus akan menghampiri suara ketukan besi untuk pemberian pakan sore hari, pada jarak 3 mIkan Kerapu Tikus akan menghampiri pakan pada ketukan besi selama 12 detik, pada jarak 4 mIkan Kerapu Tikus akan menghampiri ketukan besi selama 14 detik, pada jarak 5 m saat ketukan besi di bunyikan Ikan Kerapu Tikus menghampiri selama 17 detik, dan pada jarak 6 mIkan Kerapu Tikus akan datang menghampiri suara ketukan dengan waktu 18 detik. Respon Ikan Kerapu Tikus saat makan pada pagi hari tidak terlalu berbeda dengan respon pada saat pemberian pakan sore hari. Maka semakin jauh maka semakin lama reaksi Ikan Kerapu Tikus mendekati pakan., The Rat Grouper (Cromileptes altevalis) has very bright prospects for cultivation because it is one of the species that has high economic value and has excellent domestic and foreign market opportunities. Conditioning is a form of learning that allows organisms to respond to stimuli that previously did not cause that response, or a process to introduce various reflexes into behavior. This study aims to see the response of the Rat Grouper to a stimulus in the form of a sound signal when feeding. The steps taken in detecting the characteristics of the Rat Grouper are pond preparation, acclimatization, iron knocking. Fish response to feeding using iron tap. At a distance of 1 m the mouse grouper will approach the sound of iron knocking for 8 seconds, at a distance of 2 m for 10 seconds the mouse grouper will approach the sound of iron knocking for feeding in the afternoon, at a distance of 3 m the Rat Grouper will approach the feed at the iron tap for 12 seconds, at a distance of 4 m the Rat Grouper will approach the iron knock for 14 seconds, at a distance of 5 m when the iron knock is sounded, the Rat Grouper will approach for 17 seconds, and at a distance of 6 m the Rat Grouper will approach the knocking sound with time 18 seconds. The response of the Rat Grouper when feeding in the morning was not too different from the response at the time of feeding in the afternoon. So the farther away, the longer the reaction of the Rat Grouper to the feed.
Keyword: Conditioning, Rat Grouper, Iron Knock, Fish Response, Behavior

Judul: Kinerja Produksi Pendederan Ikan Kerapu Cantang dalam Keramba Jaring Apung di Laut dengan Pencahayaan Teduh dan Terang
Abstrak: Ikan kerapu bersifat nokturnal dan memiliki sifat kanibalisme tinggi pada pemeliharaan dengan pencahayaan terlalu terang. Pendederan ikan kerapu dalam keramba jaring apung (KJA) di laut telah diaplikasikan, namun intensitas cahaya tidak terkontrol. Penelitian ini bertujuan untuk menganalisis pengaruh kondisi pencahayaan teduh dan terang melalui penggunaan penutup KJA dengan kerapatan yang berbeda terhadap kinerja produksi pendederan ikan kerapu cantang di laut. Rancangan Acak Lengkap digunakan dalam penelitian ini dengan perlakuan pencahayaan teduh (kedalaman 1 m 1472 lux dan permukaan 2405 lux) dan terang (kedalaman 1 m 3633 lux dan permukaan 16.552 lux) dan setiap perlakuan diulang tiga kali. Ikan kerapu cantang (bobot 7,18±0,17 gram dan panjang 7,06±0,051 cm) dipelihara dalam KJA selama 32 hari dengan padat tebar 100 ekor/m³ dan diberi pakan buatan berupa pelet tenggelam dengan metode ad-satiation pada 08.00, 12.00, dan 16.00 WIB. Oksigen terlarut, suhu, pH, dan salinitas air dalam KJA diukur setiap 7 hari, sedangkan ammonia setiap 2 minggu. Nilai koefisien keragaman panjang dan tingkat kanibalisme pada perlakuan teduh lebih tinggi dari perlakuan terang., Groupers are nocturnal and have high cannibalism in rearing with too bright light. Nursery of grouper in floating net cages (KJA) in the sea has been applied, but the light intensity is uncontrolled. This study aims to analyze the effect of shady and bright lighting conditions through the use of KJA covers with different densities on the nursery production performance of cantang grouper in the sea. Completely randomized design was used in this study with shady (depth 1 m 1472 lux and surface 2405 lux) and bright lighting (depth 1 m 3633 lux and surface 16.552 lux) and each treatment was three replications. Cantang grouper (weight 7,18±0,17 grams and length 7,06±0,051 cm) was reared in KJA for 32 days with a stocking density of 100 fish/m³ and given artificial feed in the form of sinking pellets by ad-satiation method at 08.00, 12.00 and 16.00 WIB. Dissolved oxygen, temperature, pH, and salinity of water in KJA were measured every 7 days, while ammonia every 2 weeks. The coefficient of length variation and the level of cannibalism in the shade treatment were higher than in the light treatment.
Keyword: floating net cages (KJA), grouper, nuersery, shady and light

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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