Judul: Efektivitas Penambahan Enzim Komersial pada Pakan dengan Kadar Protein yang Berbeda terhadap Kinerja Pertumbuhan Pembesaran Ikan Sidat Anguilla bicolor bicolor
Abstrak: Upaya untuk mengoptimalkan pertumbuhan dan efisiensi pakan ikan sidat Anguilla bicolor bicolor dapat dilakukan dengan penambahan enzim. Penelitian ini bertujuan untuk menganalisis efektivitas penggunaan enzim pada pakan dengan kadar protein yang berbeda terhadap kinerja pertumbuhan pembesaran ikan sidat. Perlakuan pada penelitian ini terdiri dari pemberian pakan dengan kadar protein berbeda dan dosis enzim yaitu (A) 35%;0,25 g/kg, (B) 40%;0,25 g/kg, (C) 45%;0,25 g/kg, dan (D) 45%;0 g/kg. Ikan sidat dipelihara dalam akuarium berukuran 50 x 40 x 35 cm3 dengan tinggi air 20 cm. Bobot rata-rata awal ikan uji 19,25 ± 0,80 g dengan padat tebar awal 4 g/L. Hasil penelitian menunjukkan bahwa perlakuan tidak menghasilkan perbedaan nyata (P>0,05) terhadap biomassa akhir, jumlah konsumsi pakan, laju pertumbuhan mutlak bobot, laju pertumbuhan spesifik, rasio konversi pakan, retensi protein, retensi lemak, serta derajat kelangsungan hidup. Perlakuan menghasilkan perbedaan nyata terhadap koefisien keragaman bobot (P<0,05). Perlakuan terbaik adalah pakan dengan kadar protein 35% dengan enzim 0,25 g/kg yang menghasilkan koefisien keragaman bobot terendah.
Keyword: enzim, ikan sidat, kadar protein, pertumbuhan

Judul: Efektivitas Penggunaan Enzim Komersial pada Pakan dengan Kandungan Protein yang Berbeda terhadap Kinerja Pertumbuhan Elver Ikan Sidat Anguilla bicolor bicolor.
Abstrak: Penelitian ini bertujuan untuk menganalisis kinerja pertumbuhan terbaik elver ikan sidat Anguilla bicolor bicolor yang diberikan pakan berkadar protein berbeda dengan penambahan enzim komersial. Ikan sidat dengan bobot 5,00±0,56 gekor-1 dipelihara dalam akuarium dengan volume 40 L pada padat tebar 4 gL-1 selama 60 hari. Penelitian ini menggunakan rancangan acak lengkap yang terdiri atas empat perlakuan dan tiga ulangan pada masing-masing perlakuan. Perlakuan tersebut adalah pakan yang mengandung protein 35% dengan enzim komersial 0,25 g kg-1dikodekan sebagai P1(35%;0,25 g kg-1), P2 (40%;0,25 g kg-1), P3 (45%;0,25 g kg-1), dan P4 (45%;0 g kg-1). Hasil penelitian menunjukkan bahwa nilai laju pertumbuhan mutlak, laju pertumbuhan spesifik, laju pertumbuhan mutlak biomassa, biomassa akhir, rasio konversi pakan, dan retensi protein pada masing-masing perlakuan menunjukkan perbedaan yang nyata (P<0,05). Derajat kelangsungan hidup, retensi lemak, dan koefisien keragaman bobot tidak menunjukkan perbedaan yang nyata antar perlakuan (P>0,05). Dapat disimpulkan bahwa kinerja pertumbuhan terbaik terdapat pada elver ikan sidat A.bicolor bicolor yang diberikan pakan dengan kandungan protein 40% dan penambahan enzim 0,25 g kg-1(P2).
Keyword: Anguilla bicolor bicolor, enzim, kinerja pertumbuhan, protein

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