Judul: interspesific crosses between rosy barb (Puntius conchonius) and denisonii (Puntius denisonii) through artificial spawning
Abstrak: Kawin silang merupakan kegiatan dalam pemuliaan ikan untuk meningkatkan keragaman genetik dan menggabungkan beberapa fenotipe. Tujuan penelitian ini mengevaluasi performa kawin silang interspesifik antara ikan barbir dengan ikan denisoni serta karakter fenotipe dan pertumbuhan hibridanya. Penelitian menggunakan metode eksplorasi dengan rancangan acak lengkap, empat perlakuan masing-masing tiga ulangan. Perlakuan berupa persilangan antara ikan barbir betina dengan denisoni jantan (BD) dan resiprokalnya (DB) dibandingkan dengan perkawinan sesama spesies ikan barbir (BB) serta ikan denisoni (DD). Semua pemijahan dilakukan secara buatan dengan induksi hormon. Persilangan DB menunjukkan derajat pembuahan (73,17%), penetasan (72,47%) dan pertumbuhan (7,23%) yang lebih tinggi dibandingkan dengan resiprokalnya (BD), namun tingkat kelangsungan hidupnya lebih rendah (41,78% dan 31,53%). Karakteristik fenotipe hibrida cenderung mewarisi ciri yang dimiliki tetua betinanya.
Keyword: artificial spawning, hybrid, Puntius conchonius, Puntius denisonii, reciprocal

Judul: Hybridization Performance of Denisoni Sahyadria denisonii with Rosy Barb Pethia conchonius
Abstrak: Hybridization can produce offspring with better characteristics than their original parent but the opportunity to be succeed is one of the limiting factors. This study aims to identify the successful of hybridization between denisoni and rosy barb. This study was conducted with exploration method using random design complete (RAL) with treatments: DD (denisoni ♀ >< denisoni ♂), BB (rosy barb ♀ >< rosy barb ♂), DB (denisoni ♀ >< rosy barb ♂), BD (rosy barb ♀ >< denisoni ♂) and 3 repetition. The mating was done artificially using Ovaprim® and stripping. Eggs hatched and the larvae reared for 7 days after hatching. The parameters observed including semen volume, spermatocrit, sperm morphology, motility, viability, fecundity, FR, HR, and SR. Hybridization between denisoni and rosy barb was possible for BD treatment otherwise was impossible with differences towards sperm physiological and morphological characteristics, motility, viability, and fecundity between denisoni and rosy barb, also FR, HR, and SR value was significantly different (P<0,05) between treatments., Hibridisasi dapat menghasilkan benih dengan karakter yang lebih unggul daripada tetuanya namun memiliki keterbatasan berupa peluang keberhasilan dalam melakukan kawin silang. Penelitian ini bertujuan mengidentifikasi keberhasilan hibridisasi antara ikan denisoni dengan ikan barbir. Penelitian ini dilakukan dengan metode eksplorasi menggunakan rancangan acak lengkap (RAL) dengan perlakuan: DD (denisoni ♀ >< denisoni ♂), BB (barbir ♀ >< barbir ♂), DB (denisoni ♀ >< barbir ♂), BD (barbir ♀ >< denisoni ♂) dengan 3 kali ulangan. Pemijahan dilakukan secara buatan dengan bantuan induksi Ovaprim® dan proses stripping. Telur ditetaskan dan larva yang dihasilkan dipelihara hingga 7 hari pascatetas. Parameter yang diamati meliputi volume cairan semen, spermatokrit, morfologi sperma, motilitas, viabilitas, fekunditas, FR, HR, dan SR. Persilangan antara ikan denisoni dan ikan barbir memiliki peluang pada perlakuan BD namun tidak untuk sebaliknya dengan adanya perbedaan terhadap karakteristik fisiologis dan morfologi sperma, motilitas, viabilitas, dan fekunditas antara ikan denisoni dan ikan barbir serta adanya perbedaan yang signifikan (P<0,05) terhadap nilai FR, HR, dan SR antar perlakuan.
Keyword: 

Judul: Kajian Atmosfer Bawah Wilayah Tropis dan Subtropis
Abstrak: Planetary Boundary Layer is the lowest part of the atmosphere directly affected by the earth’s surface and responds to surface forcings within a time period of hourly to daily. The thickness of boundary layer varies over space and time, ranging from hundreds of meters to a few kilometers. The objective of this study consist of the analysis of Boundary Layer based on diurnal and nocturnal vertical profiles of meteorological properties and identification of characteristics pertaining to tropical atmosphere (represented by Soekarno-Hatta (6.110S, 106.650E), Polonia (3.560N, 98.680E), and Da Nang (16.030N, 108.200E) stations) and subtropical atmosphere (represented by Perth (31.930S, 115.960E), Nanjing (32.000N, 118.800E), and Hakasskaja (43.780N, 87.620E) stations). Virtual potential temperature, specific humidity, wind speed and direction, atmospheric stability, and Bulk-Richardson number are used to estimate the boundary layer thickness. Vertical profile of the virtual potential temperature and specific humidity are used to determine the Mixed Layer heights during the day and Residual Layer heights during the night. On the other hand, the mean value of Turbulent Flow Thickness is derived from the vertical profile of the Bulk-Richardson number (RiB). Analytical results of this study revealed that Mixed Layer height in the tropical atmosphere varies in a range from 260 m to 1410 m, Residual Layer height varies in a range from 267 m to 925 m, whereas the Turbulent Flow Thickness variation is confined between 0 m to 335 m. In subtropical atmosphere Mixed Layer height varies in a range from 101 m to 1483 m, Residual Layer height varies in a range from 121 m to 1276 m, whereas the Turbulent Flow Thickness variation is confined between 0 m to 769 m. This study also revealed that, except during summer, Mixed Layer Heights in the tropics are normally higher than in the subtropics.
Keyword: