Judul: Kinerja Produksi fingerling Ikan Sidat Anguilla bicolor bicolor pada Sistem Resirkulasi Berbasis Probiotik
Abstrak: Budidaya ikan sidat (Anguilla bicolor bicolor) menggunakan sistem resirkulasi efisien dalam penggunaan air, namun sampai saat ini masih dilakukan pergantian air untuk membantu menjaga kualitas air tetap optimum karena pakan sidat yang berupa pasta mempercepat penyumbatan pada filter. Penggunaan probiotik dalam akuakultur dapat meningkatkan kinerja produksi ikan sidat dengan aplikasi ke air pemeliharaan ikan untuk memperbaiki kualitas air dan penambahan pada pakan. Penelitian ini bertujuan untuk menganalisis efektivitas probiotik terhadap kinerja produksi ikan sidat (Anguila bicolor bicolor) dalam sistem resirkulasi. Perlakuan yang diuji adalah penambahan probiotik pada air, probiotik pada pakan, probiotik pada air dan pakan (kombinasi), serta kontrol (tanpa pemberian probiotik), yang masing-masing diulang tiga kali. Ikan sidat berbobot rata-rata 19,8 ± 0,56 g dan panjang rata-rata 25,0 ± 0,8 cm dipelihara selama 60 hari dengan perlakuan tersebut dalam sistem RAS dengan pergantian air setiap tiga hari sebanyak 20%. Hasil percobaan memperlihatkan bahwa semua perlakuan menghasilkan kelangsungan hidup 100%, namun kinerja produksi terbaik diperoleh pada perlakuan penambahan probiotik secara kombinasi pada pakan dan air.
Keyword: Anguilla bicolor bicolor, pertumbuhan, probiotik

Judul: Kinerja Produksi Elver Ikan Sidat Anguilla bicolor bicolor dalam Sistem Resirkulasi pada Media Bersalinitas 5 g L-1 dengan Alkalinitas yang Berbeda.
Abstrak: Ikan sidat merupakan komoditas perikanan yang memiliki nilai ekonomis tinggi. Kendala yang dihadapi adalah pertumbuhan ikan sidat yang lambat. Salah satu aspek untuk meningkatkan pertumbuhan ikan sidat adalah perbaikan kualitas air. Penelitian ini bertujuan untuk menentukan kisaran alkalinitas yang optimal untuk meningkatkan kinerja produksi ikan sidat. Penelitian ini menggunakan rancangan acak lengkap dengan perlakuan penambahan kalsium karbonat (CaCO3) 25 mg L-1, 50 mg L-1, dan 75 mg L-1 dengan tiga kali ulangan. Ikan sidat yang digunakan berbobot rata-rata 9,19±0,2 g yang dipelihara selama 60 hari. Hasil penelitian menunjukkan derajat kelangsungan hidup sebesar 100% pada semua perlakuan, namun hasil terbaik pada penelitian ini diperoleh pada perlakuan penambahan kalsium karbonat 50 mg L-1 dengan alkalinitas berkisar 103,30-110,00 mg L-1. Laju pertumbuhan bobot mutlak sebesar 0,045±0,001 g hari-1, laju pertumbuhan bobot spesifik sebesar 0,56±0,02 % hari-1, dan rasio konversi pakan sebesar 4,80±0,10.
Keyword: alkalinitas, Anguilla bicolor bicolor, 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