Judul: Produktivitas Ikan Lele (Clarias sp.) pada Sistem Pendederan yang Terintegrasi dengan Ikan Nila (Oreochromis niloticus) dan Ikan Gurame (Oshpronemus goramy Lac.)
Abstrak: The research was aimed to evaluate rearing tank productivity and system of rearing catfish integrated with nile tilapia and giant gourami. Treatment of the research was catfish rearing integrated with rearing of nile tilapia and giant gourami and flowed with the recirculation water at discharge of 1,5 lpm. A control was the catfish rearing with 50% water change every 3 days. Catfish at average length of 4.43±0.22 cm stocked at density of 667 fish/m2 to cemented rearing tank while the nile tilapia and giant gourami at average length of 4.12±0.34 cm dan 1.9±0.12 cm respectivelly stocked to the rearing pond at density of 24 fish/m2 dan 10 fish/m2 respectivelly. Feeding was applied to catfish rearing, while the gouramy and nile used wastes of the catfish rearing. The research result showed that the growth, biomass and feed efficiency of the catfish in the integrated rearing same as that of control, while the survival rate was lower. The presence of the nila tilapia and giant gourami could reduce total ammonia nitoged up to 23.14% and lead to higher economic benefit than the control
Keyword: productivity, integrated, growth, nile tilapia, catfish

Judul: Kinerja Produksi dan Usaha Pendederan Larva Ikan Nila (Oreochromis niloticus) pada Sistem Resirkulasi dengan Padat Tebar Berbeda
Abstrak: Peningkatan produksi ikan nila (Oreochromis niloticus) merupakan gambaran peningkatan konsumsi ikan di masyarakat. Peningkatan produksi perlu diikuti dengan penyediaan benih yang mencukupi untuk pembesaran. Upaya yang dapat dilakukan adalah dengan intensifikasi melalui peningkatan padat tebar larva nila pada tahap pendederan. Tujuan penelitian ini adalah menganalisis kinerja produksi dan usaha pendederan larva ikan nila pada sistem resirkulasi dengan padat tebar berbeda. Penelitian dilakukan selama 42 hari menggunakan rancangan acak lengkap dengan perlakuan padat tebar larva ikan nila, yaitu 5, 10, dan 15 ekor L-1 dengan lima ulangan. Perlakuan perbedaan padat tebar berpengaruh nyata terhadap laju pertumbuhan mutlak panjang (LPMP), laju pertumbuhan spesifik panjang (LPSP), rasio konversi pakan (RKP), dan produktivitas. Perlakuan padat tebar 15 ekor L-1 menghasilkan LPMP, LPSP, dan produktivitas yang lebih tinggi daripada perlakuan lain, sedangkan nilai RKP menunjukkan nilai terendah. Penelitian menghasilkan kesimpulan bahwa kinerja produksi dan usaha terbaik pada pendederan ikan nila bersistem resirkulasi dihasilkan pada padat tebar 15 ekor L-1 dengan memberikan produktivitas sebesar 106.112 ekor m-3 tahun-1, revenue/cost ratio senilai 1,54, dan payback period yaitu 0,65 tahun.
Keyword: business analysis, tilapia, nursery, recirculation system, stocking density

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