Judul: Upaya maskulinisasi induk ikan lele dumbo Clarias sp. yang telah diovariektomi parsial dengan metode implantasi hormon 17a-Metiltestosteron
Abstrak: Fakta di lapangan yang menunjukkan bahwa ikan lele betina tumbuh lebih cepat dari pada ikan lele jantan, sehingga agar produksi ikan lele untuk konsumsi (100-150g) dapat lebih efisien dan efektif perlu dilakukan sistem budidaya monoseks betina.
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Judul: Maskulinisasi Ikan Lele Clarias sp. Melalui Suplementasi Serbuk Sari Pinus dalam Pakan
Abstrak: Ikan lele (Clarias sp.) merupakan ikan konsumsi yang banyak dibudidayakan di Indonesia. Pemijahan buatan pada ikan lele mengharuskan membunuh ikan jantan karena tidak dapat distripping, kondisi tersebut mengakibatkan ketersediaan jantan semakin lama semakin berkurang sehingga ketersediaan ikan jantan sangat penting untuk pemenuhan kebutuhan tersebut. Sex reversal (maskulinisasi) merupakan metode yang dilakukan untuk membuat jumlah ikan lele jantan lebih banyak yang kemudian dipersiapkan sebagai calon induk. Tujuan penelitian ini adalah menentukan dosis optimal serbuk sari pinus untuk maskulinisasi ikan lele. Benih ikan lele yang digunakan berumur 7 hari dengan kepadatan 30 ekor per 50 liter air dan diberi perlakuan selama 60 hari. Terdapat empat perlakuan berbeda, kontrol (tanpa penambahan serbuk sari pinus), serbuk sari pinus 0,3 g/kg pakan, serbuk sari pinus 0,5 g/kg pakan, dan serbuk sari pinus 0,7 g/kg pakan. Hasil penelitian menunjukkan bahwa persentase kelamin jantan pada perlakuan 0,3 g/kg sebesar 66,67±11,55%, dosis 0,5 g/kg sebesar 76,67±11,55%, dosis 0,7 g/kg sebesar 73,33±5,77 %, dan perlakuan kontrol sebesar 50±10%. Berdasarkan data hasil persentase kelamin jantan diketahui bahwa perlakuan terbaik terdapat pada dosis 0,5 g/kg (P<0,05). Suplementasi serbuk sari pinus dengan dosis yang berbeda dalam pakan dapat memaskulinisasi benih ikan lele., Catfish (Clarias sp.) is a consumption fish that is widely cultivated in Indonesia. Artificial spawning in catfish requires killing male fish because they cannot be stripped, this condition results in the availability of males decreasing over time so that the availability of male fish is very important to meet these needs. Sex reversal (masculinization) is a method used to make a larger number of male catfish which are then prepared as prospective broodstock. The purpose of this study was to determine the optimal dose of pine pollen for masculinization of catfish. The catfish seeds used were 7 days old with a density of 30 fish per 50 liters of water and were treated for 60 days. There were four different treatments, control (without the addition of pine pollen), pine pollen 0,3 g/kg feed, pine pollen 0,5 g/kg feed, and pine pollen 0,7 g/kg feed. The results showed that the percentage of male sex in the 0,3 g/kg treatment was 66,67 ± 11,55%, the dose of 0,5 g/kg was 76,67 ± 11,55%, the dose of 0,7 g/kg was 73,33 ± 5,77%, and the control treatment was 50 ± 10%. Based on the data on the percentage of male sex it is known that the best treatment is at a dose of 0,5 g/kg (P<0,05). Supplementation of pine pollen with different doses in feed can masculinize catfish seeds.
Keyword: male, pine pollen, sex reversal

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