Judul: Kinerja Produksi Belut Monopterus albus dalam Sistem Resirkulasi dengan Pemberian Pakan Buatan sebagai Pengganti Pakan Alami
Abstrak: Penelitian ini bertujuan untuk menganalisis kinerja produksi belut Monopterus albus dalam sistem resirkulasi dengan pemberian pakan buatan sebagai pengganti pakan alami. Perlakuan yang diujikan yaitu pemberian pakan alami berupa daging lele dan pakan buatan pada perbandingan 1:0, 2:1, 1:2, dan 0:1. Belut sawah yang digunakan adalah hasil tangkapan dari persawahan dengan bobot individu 11,47±1,86 g yang ditebar pada 12 wadah pemeliharaan dengan masing-masing biomassa 1,5 kg m-2 setiap wadah. Wadah pemeliharaan berukuran 50 cm x 30 cm x 30 cm yang diisi air dengan ketinggian 5 cm. Sistem resirkulasi dirangkaikan dalam masing-masing wadah dan dioperasikan selama 24 jam. Waktu pemeliharaan adalah 56 hari dengan pemberian pakan setiap hari sekali pada dosis 4%. Hasil penelitian menunjukkan bahwa pemberian pakan buatan tidak berpengaruh nyata (p>0,05) terhadap kinerja produksi belut. Pemberian pakan buatan pada rasio 2:1 menghasilkan kinerja produksi yang sama baik dengan pemberian pakan daging lele yaitu tingkat kelangsungan hidup (95,5±7,9 %), laju pertumbuhan mutlak (0,160±0,065 g hari-1), laju pertumbuhan spesifik (1,00±0,32 %), dan nilai faktor kondisi (0,084±0,012).
Keyword: belut, pakan buatan, sistem resirkulasi

Judul: Kinerja Produksi Belut Monopterus albus pada Sistem Resirkulasi dengan Ukuran Benih yang Berbeda
Abstrak: Pasokan belut di perkotaan masih berasal dari hasil tangkapan di pedesaan. Oleh karena itu perlu dilakukan upaya budidaya yang belut lebih mendekatkan unit produksi dengan sentra konsumen sehingga permintaan terpenuhi tepat waktu. Sistem resirkulasi merupakan suatu alternatif pemanfaatan sumberdaya air dan lahan terbatas di perkotaan yang dapat mendukung upaya tersebut. Benih belut yang berasal dari tangkapan alam memiliki ukuran yang beragam. Penelitian ini bertujuan untuk mengevaluasi ukuran benih yang menghasilkan kinerja produksi terbaik dengan sistem resirkulasi. Belut dengan ukuran 6,8 ± 1,0 g ekor-1; 13,5 ± 1,2 g ekor-1; dan 21,3 ± 1,5 g ekor-1 dipelihara pada media air dengan sistem resirkulasi selama 56 hari. Belut diberi pakan cacahan ikan lele dengan metode pemberian pakan restricted sebanyak 4% dari biomassa. Hasil penelitian menunjukkan bahwa ukuran benih yang berbeda berpengaruh nyata terhadap koefisien keragaman bobot belut. Perlakuan dengan ukuran penebaran awal 13,5 g ekor-1 memberikan hasil terbaik pada koefisien keragaman bobot dengan nilai 18,03 ± 3,98, pada derajat kelangsungan hidup 90 %, laju pertumbuhan spesifik 0,55 % hari-1, pertumbuhan mutlak bobot 0,09 ± 0,03, keragaman panjang 4,65 ± 1,12, rasio konversi pakan 6,30 ± 1,45 dan pertambahan biomassa mutlak 0,36 ± 0,18 kg.
Keyword: Monopterus albus, Kinerja produksi, Resirkulasi

Judul: Characteristic of Overshooting Top (OT) Based on  Himawari  8  Satellite  as  a  Convective  Cloud  Feature  that  Generates  Extreme Weather in the Java Island Region
Abstrak: Overshooting Top (OT) is a feature at the top of a convective cloud that is associated with extreme weather. Research on OT in tropical Indonesia is still very limited. The existence of geostationary satellites with wide area coverage and fast frequency observations is useful for observing the fast dynamics of the OT life cycle. Therefore, this study intends to analyze the relationship between OT and extreme weather, updraft and thermodynamic conditions of OT when extreme weather occurs, the best objective method for detecting OT in the day time and night time, and the spatiotemporal distribution of OT in the tropical region of Java Island during the 2018-2021 period. Based on visual analysis using visible channel and Himawari 8 sandwich products, 87% of extreme weather events in Java were accompanied by the appearance of OT. It indicates that the presence of the OT pattern is a convection cloud pattern or feature that is closely related to extreme weather events for the Java Island region. The existence of a time lag between the appearance of OT and extreme weather events on Java Island indicates that the OT of convection cloud can be used as a precursor or nowcasting for the appearance of extreme weather. Most of the convective cloud OT features during extreme weather events on Java Island have altitude that were only able to exceed the altitude of the equilibrium level and few were able to exceed the tropopause level of 9 km – 16 km. The difference in atmospheric conditions during extreme weather events on Java Island, which is in the tropics and subtropics, is a strong and unstable convective energy condition characterized by a larger CAPE, as well as unstable KI, LI, SI and TTI values. It is offset by kinematic factors in the form of a weak vertical wind shear (bulk wind shear 0-6 km) and a higher freezing point height. The difference between extreme weather events in the Java Island region and other tropical regions compared to subtropical regions is the strong updraft speed of convection clouds. The IRW Texture COMB algorithm based on the IRW-Texture Gradient modification and the COMB algorithm shows a significant increase in quality for detecting OT and non-OT pixels in Java. Rainy days with rainfall > 50 mm/day are very common in areas with an altitude of > 500 m. On the other hand, the level of convection activity which is indicated by the presence of OT and lightning is significantly reduced in this area. OT of convective clouds appear more frequently during the DJF season and less frequently during the JJA season. OT often appears during the day time and rarely at night time. Most OTs appear in the central part, away from the south and north coasts of Java Island during the day, while OTs that appear near the south and north coasts of Java Island can appear in the morning or afternoon.
Keyword: convective clouds, extreme weather, Overshooting Tops, Himawari 8 Satellite