Judul: Pengaruh pemberian daphnia sp. sebanyak 2 kali, 4 kali dan 6 kali konsumsi makanan harian terhadap pertumbuhan benih ikan lele (Clarias batrachus L.)
Abstrak: Penelitian ini bertujuan untuk mengetahui jumlah pemberian Daphnia sp. yang terbaik dalam menghasilkan pertumbuhan dan kelangsungan hidup benih lele. Pelaksanaan penelitian dilakukan di Laboratorium Budidaya Perikanan Darmaga Bogor, selama 30 hari mulai dari tang- gal 9 Januari sampai 8 Februari 1987. Wadah penelitian adalah akuarium berukuran 60 * 50 x 40 cm³ sebanyak 9 buah. Disekeliling akuarium diselubungi plastik hitam. Ketinggian air kira-kira 15 cm dan tiap wadah diberi aerasi. Dasar wadah dilapisi substrat batu kerikil kira-kira setengah bagian. Ikan uji yang digunakan adalah benih lele berumur 7 hari yang diperoleh dari hasil tetasan telur di akuarium. Penebaran awal adalah 210 ekor per wadah. Makanan yang diberikan berupa Daphnia sp. yang terdiri dari 3 ukuran yaitu x <= 0, 5 , 0,5 < X <= 1 ,0 mm dan 1, 0 < x < 2, 0 mm. Rancangan percobaan yang digunakan adalah RAL dengan 3 perlakuan dan 3 ulangan. Perlakuan A yaitu jumlah pemberian Daphnia sp. sebanyak 2 kali konsumsi makanan harian benih lele. Perlakuan B adalah pemberian Daphnia sp. sebanyak 4 kali konsumsi makanan harian benih lele. Dan perlakuan C yakni jumlah pemberian Daphnia sp. 6 kali konsumsi makanan harian benih lele. Untuk mengetahui hubungan antara jumlah makanan yang diberikan dengan pertumbuhan benih lele digunakan analisa sidik ragam dan dilanjutkan dengan uji Tukey. ...
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Judul: Pengaruh frekuensi pemberian makanan terhadap pertumbuhan benih ikan lele (Clarias batrachus L)
Abstrak: Penelitian ini bertujuan untuk mengetahui pengaruh frekuensi pemberian makanan terhadap pertumbuhan benih ikan lele (Clarias batrachus L). Parameter yang diukur adalah kelangsungan hidup, laju pertumbuhan harian individu benih ikan lele dan efisiensi makanan buatan yang diberikan selama penelitian. Penelitian ini dilakukan di Laboratorium Kolam Percobaan Budidaya Perairan, Fakultas Perikanan, Institut Pertanian Bogor, Darmaga, Bogor, mulai tanggal 9 Juli sampai 14 Oktober 1986. Penelitian ini menggunakan rancangan acak lengkap (RAL) dengan tiga kali ulangan dan tiga perlakuan yang terdiri dari satu, dua dan tiga kali pemberian makanan dalam sehari. Banyaknya makanan yang diberikan disesu- aikan setiap 10 hari sekali berdasarkan bobot ikan lele. Kelangsungan hidup benih ikan lele yang dipelihara tidak berbeda untuk ketiga perlakuan, yaitu rata-rata umum sebesar 99,6 %. Laju pertumbuhan harian individu benih ikan lele meningkat dengan peningkatan frekuensi pemberian makanan dari satu kali sampai tiga kali, yaitu dari 1,43 % sampai 2,76 %. Efisiensi makanan yang diperoleh juga me- ningkat dari 27,81 % sampai 64,28 % dari pemberian ma- kanan satu sampai tiga kali dalam sehari…
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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