Judul: Pengaruh peningkatan kualitas gizi Artemia salina Leach terhadap derajat kelangsungan hidup larva udang galah ( Macrobrachium rosenbergii De Man )
Abstrak: Untuk meningkatkan kualitas gizinya, Artemia salina diberi makanan selama tujuh jam dengan menggunakana S. cerevisiae + minyak ikan; Chlorella sp. (species laut) dalam media pemeliharaannya. Penelitian ini bertujuan untuk melihat pengaruh pemberian S. cerevisiae + minyak ikan Chlorella sp. dalam media pemeliharaan A. salina terhadap derajat kelangsungan hidup larva udang galah dan pertambahan panjang tubuh larva sebagai faktor penunjang. Penelitian ini dilakukan di Kolam Percobaan Budidaya Perairan, Fakultas Perikanan, Institut Pertanian Bogor, Darmaga, Bogor. Larva yang digunakanan berumur dua hari. Larva dipelihara dalam wadah plastik berbentuk silinder dengan volume 9 liter dan berisi air sebanyak 7 liter. Media pemeliharaan larva udang galah adalah air payau bersalinitas delapan promil. Padat penebaran larva adalah 100 ekor per-liter air. Pemberian A. salina dilakukan sebanyak dua kali sehari yaitu setiap pagi dan sore hari. A. salina yang akan diberikan sebelumnya diberi perlakuan terlebih dahulu. Jumlah A. salina yang diberikan menurut Aquacop (1983). Pengukuran panjang tubuh dilakukan pada awal dan akhir penelitian untuk memperoleh data pertambahan panjang tubuh larva.
Keyword: 

Judul: Pengaruh peningkatan kualitas gizi artemia salina leach yang diberi saccharomyces cerevisease- minyak ikan : chlorella sp. (spesies laut) terhadap derajat kelangsungan hidup benih udang windu (Panaeus monodon fabricus)
Abstrak: Artemia salina telah digunakan secara luas dalam akuakultur sebagai makanan yang baik untuk ikan laut dan krustasea. Namun Artemia salina strain tertentu memiliki komposisi nutrisi yang tidak selalu dapat memenuhi kebutuhan gizi larva, antara lain adanya variasi dari kadar asam lemak tidak jenuh jamak berantai panjang (HUFA) seperti asam eicosapentaenoat dan decosaheksanoat, yang secara langsung akan menyebabkan hasil kultur benih udang yang bervariasi. Penelitian ini bertujuan untuk mengetahui pengaruh pemberian makanan, yaitu pemberian Saccharomyces cerevi- seae-minyak ikan; Chlorella sp. (spesies laut) untuk mengubah kualitas gizi Artemia salina terhadap derajat kelangsungan hidup benih udang windu. Rancangan yang digunakan adalah Rancangan Acak Lengkap (RAL) dengan 3 perlakuan dan 3 ulangan. Parameter penunjang adalah pertambahan panjang mutlak, sedangkan parameter kualitas air yang diukur adalah salinitas, suhu, pH dan amonia. Kelangsungan hidup benih udang yang diberi Artemia saling yang telah diberi makanan Chlorella sp. (spesies laut) yaitu 93,10 % atau Saccharomyces cereviseae-minyak ikan (89,76 %), lebih baik dibandingkan dengan benih udang yang diberi Artemia salina tanpa diberi perlakuan sebelum- nya (69,28 %). Dari kedua perlakuan tersebut ternyata benih udang yang diberi Artemia salina yang sebelumny a telah diberi Chlorella sp. (spesies laut) mempunyai kelang- sungan hidup yang tertinggi. Pertambahan panjang benih udang dari ketiga perlakuan menunjukkan hasil yang sama. Kualitas air yang diamati ternyata masih dalam batas- batas yang layak untuk pertumbuhan benih udang…
Keyword: 

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