Judul: Design and construction of mini flume tank for fish swimming behaviour experiment
Abstrak: This research is carried out to design and construct mini flume tank that is reliable and ideal used for fish swimming behavior experiment through a series testing the flume tank for its technical performance. The mini flume tank has a maximum water velocity 85 cm/s (1.7 knots), with dimensions of 250 x 135 x 55 cm, and water capacity 155 litres. Based on the operation test, field observation on the tanks was clearly visible due to minimal air bubbles in the water flow. The observations for fish swimming behaviour experiment could be conducted from the two view fields (top and side) that allow observation of swimming endurance and fish tail flick easily. The water velocity visually was in laminar category at each level of the tested flow speeds. The rpm of motor was relatively stable for more than 200 minutes. The motor temperature was below 60 oC at frequency of 10 to 40 Hz. At frequency of 50 Hz the temperature reached 60 °C in 25 minutes and stable at 73oC after an hour. Water temperature changes during the test for more than 200 minutes at different speeds which have differences of 0.2 to 1.8 oC. The test result showed that the mini flume tank performance was reliable and ideal used for fish swimming behavior experiment.
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Judul: Uji Kinerja Mini Flumetank dan Pengukuran Performa Renang Ikan Bawal (Colossoma macropomum).
Abstrak: Mini flumetank merupakan tangki berarus yang digunakan untuk menguji dan melihat tingkah laku serta performa renang ikan. Tahun 2017 di Laboratorium Tingkah Laku Ikan, Departemen Pemanfaatan Sumberdaya Perikanan, Fakultas Perikanan dan Ilmu Kelautan, Intsitut Pertanian Bogor telah dilakukan modifikasi mini flumetank yang dimiliki agar memperoleh konstruksi dan kinerja yang lebih baik. Penelitian ini bertujuan untuk menguji kelayakan mini flumetank sebagai tangki pengamatan tingkah laku renang ikan dan pengamatan performa renang ikan bawal (Colossoma macropomum). Penelitian ini menggunakan metode pengukuran langsung untuk uji kinerja teknis dan metode observasi untuk uji performa renang ikan. Uji kinerja teknis meliputi kecepatan dan kerataan arus, keberadaan gelembung udara, suhu air, dan ketahanan mesin. Hasil penelitian kinerja menunjukkan bahwa mini flumetank memiliki nilai putaran propeler maksimal yaitu 1379 rpm menghasilkan kecepatan arus maksimum 1,4 m/s. Mini flumetank dilengkapi perangkat pengeliminasi gelembung udara dan berfungsi dengan baik. Arus yang terbentuk termasuk kategori arus laminer. Suhu mesin stabil dengan nilai maksimum mencapai 55,1oC. Suhu air mengalami peningkatan antara 0,1oC - 4,3oC. Nilai kebisingan maksimal 48 dB. Daya maksimal yang dibutuhkan motor listrik 411,6 watt. Sedangkan hasil uji performa renang ikan didapatkan pergerakan ikan bawal termasuk pergerakan yang disebut BCF Undulation tipe Subcarangiform. Kecepatan renang sustained sampai dengan maksimum 56,24 cm/s (5,5 BL/s). Uji kinerja menunjukkan bahwa hasil rekonstruksi mini flumetank layak digunakan dalam pengamatan tingkah laku renang ikan.
Keyword: ikan bawal (Colossoma macropomum), kecepatan renang, mini flumetank, uji kinerja

Judul: Lejeuneaceae Subfamily Ptychanthoideae (Hepaticae) in  West Java
Abstrak: Subfamily Ptychanthoideae of the family Lejeuneaceae (Hepaticae) in West Java is still poorly known. Publications on this subfamily are out of dated and written in the 19th or early of 20th century. The last taxonomic treatment of Ptychanthoideae of West Java was in 1933, many species names have changed since then. Studies on Ptychanthoideae of West Java are urgently needed. Studies on the Ptychanthoideae were based on the specimens collected from West Java. A total number of 361 of specimens deposited in the Herbarium Bogoriense (BO), Herbarium Biotrop (BIOT), Gottingen Herbarium (GOET) and Bangi Herbarium (UKMB) were examined, those are old and several recent specimens collected in West Java. Recent collections were made from Telaga Warna, Ciater, Gunung Halimun Salak National Park, Cibodas Botanical Garden, Bodogol Education Center and Conservation (Gunung Gede Pangrango National Park), University of Indonesia Campus Depok, including several collections from Banten Province. Twenty four species of Lejeuneaceae subfamily Ptychanthoideae are known from West Java, belonging to 8 genera namely Acrolejeunea (Spruce) Schiffn. (2 species), Archilejeunea (Spruce) Schiffn. (1 species), Lopholejeunea (Spruce) Schiffn. (10 species), Mastigolejeunea (Spruce) Schiffn. (3 species), Ptychanthus Nees (1 species), Schiffneriolejeunea Verd. (1 species), Spruceanthus Verd. (2 species) and Thysananthus Lindenb. (4 species). Two new records of Ptychanthoideae: Mastigolejeunea indica Steph. and Thysananthus minor Verdoorn are reported for Java. A determination key to the species is presented including their descriptions and illustrations.
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