Judul: The Use of Bait Booster of Bottom Gillnet  in Palabuhanratu
Abstrak: Perkembangan teknologi alat tangkap jaring rampus dan metode operasi penangkapannya tidak banyak mengalami perubahan dan cenderung statis. Selain itu, permasalahan yang dihadapi oleh nelayan rampus di Teluk Palabuhanratu adalah produktivitas hasil tangkapan yang tidak meningkat. Upaya yang dilakukan adalah penggunaan booster umpan sebagai inovasi teknologi alat bantu pemikat. Dengan demikian penelitian penggunaan booster umpan dengan kombinasi tiga jenis umpan diperlukan untuk mendapatkan solusi permasalahan bagi nelayan jaring rampus yang dapat memberikan peluang meningkatkan produktivitas hasil tangkapan sekaligus meningkatkan pendapatannya. Metode yang digunakan yaitu dengan membandingkan jaring rampus piece perlakuan dengan jaring rampus piece kontrol. Penelitian ini dilaksanakan di Laboratorium Teknologi Alat Penangkapan Ikan FPIK IPB dan Perairan Teluk Palabuhanratu dengan metode eksperimental fishing dengan melakukan sebanyak 20 trip sebagai ulangan. Hasil penelitian yang didapatkan menunjukan peningkatan pada piece perlakuan terhadap piece kontrol. Produktivitas jaring rampus perlakuan memiliki nilai yang lebih besar daripada piece kontrol, yaitu sebesar 0,85 kg/piece dan 0,50 kg/piece, kemudian untuk persentase pertambahan produksi jaring rampus piece perlakuan terhadap kontrol sebesar 70,53%. Jaring rampus perlakuan mendapatkan pendapatan bersih sebesar Rp14.446,00/piece sementara untuk piece kontrol sebesar Rp6.287,00., The development of technology for Bottom Gillnet fishing gear and its catching method has not much changed and tends to be static. In addition, the problem faced by gillnet’s fishermen in Palabuhanratu is the productivity of their catches does not increase. The effort made is the use of bait booster as the innovation of luring tool technology. Thus research on the use of bait booster with a combination of three types of bait is needed to find the solution to the problem for gillnet’s fishermen which can provide opportunities to increase catch productivity while increasing their income. The method used was to compare the treatment gillnet piece with the gillnet control piece. This research was carried out at the Fishing Equipment Technology Laboratory of FPIK IPB and Palabuhanratu with an experimental fishing method by conducting 20 trips as repetition. The research results showed an increase in the treatment piece against the control piece. The productivity of treated gillnet has a greater value than the control piece, which is 0.85 kg/piece and 0.50 kg/piece, then the percentage of treated piece productivity is 70.53%. The treated gillnet gets a net income of Rp14,446.00 while the control piece gets Rp6,287,00.
Keyword: booster, jaring rampus, Palabuhanratu, umpan, bottom gillnet, bait

Judul: The Use of Trash Fish Diluted with Squid (Loligo spp.) Bait on Bottom Gillnet in Palabuhanratu Bay
Abstrak: Perikanan jaring rampus saat ini belum mengalami banyak kemajuan dan hasil tangkapannya yang tidak selalu meningkat. Penelitian ini bertujuan untuk membandingkan komposisi hasil tangkapan jaring rampus berumpan ikan rucah yang dilarutkan cumi dengan jaring rampus tanpa umpan, menentukan pengaruh penggunaan umpan, dan menentukan produktivitas jaring rampus perlakuan dan kontrol. Penelitian dilakukan di Teluk Palabuhanratu, Kabupaten Sukabumi, menggunakan metode eksperimental fishing dengan mengikuti operasi penangkapan selama 16 trip. Hasil tangkapan pada piece jaring rampus perlakuan sebesar 69,83 kg dan piece kontrol sebesar 42,93 kg dengan rata-rata jumlah jenis ikan pada piece perlakuan yaitu 8  0,47 sedangkan kontrol yaitu 7  0,45. Hasil tangkapan dominan pada penelitian ini adalah swanggi (Priacanthus tayenus), gulamah (Johnius trachycephalus), layang anggur (Decapterus kurroides), selar bentong (Selar crumenophthalmus), dan kakap (Lates calcarifer). Perlakuan menggunakan umpan ikan rucah yang dilarutkan cumi memberikan pengaruh nyata terhadap berat total dan jumlah ekor hasil tangkapan. Penggunaan umpan membantu kenaikan persentase produktivitas piece jaring rampus perlakuan sebesar 62,7% dengan produktivitas per-piece perlakuan lebih besar dibandingkan kontrol dengan masing-masing nilainya sebesar 1,09 kg/piece dan 0,67 kg/piece dan untuk nilai produktivitas satu piece perlakuan yaitu Rp19.181,00 sedangkan kontrol yaitu Rp6946,00 sehingga didapatkan persentase produktivitas hasil tangkapan piece perlakuan terhadap piece kontrol sebesar 176,1%., Currently, bottom gillnet fishing has not made much development, and its catches are not always increasing. This study aimed to compare the composition of the catch bottom gillnet with trash fish diluted squid bait and without bait, determine the effect of bait use, and determine the productivity of treatment and control bottom gillnet. The research was conducted in Palabuhanratu Bay, Sukabumi Regency, using experimental fishing methods by following fishing operations for 16 trips. The catch on the treated piece was 69,83 kg, and the control piece was 42,93 kg, with the average number of fish species in the treated piece was 8  0,47 while the control was 7  0,45. The dominant catches in this study were bigeye bullseye (Priacanthus tayenus), leaf tail croaker (Johnius trachycephalus), redtail scad (Decapterus kurroides), bigeye scad (Selar crumenophthalmus), and snapper (Lates calcarifer). Trash fish diluted squid bait significantly affected the total weight and number of fish caught. The use of bait helped to increase the percentage of productivity of treated net pieces by 62,7%, with productivity per treated piece more significant than the control with a value of 1,09 kg/piece and 0,67 kg/piece. The productivity value of one piece of treated was Rp19.181,00 while the control was Rp6946,00, so the percentage of productivity of the treated piece catch against the control piece was 176,1%.
Keyword: bait attractor, bottom gillnet, Palabuhanratu Bay, squid, trash fish

Judul: Metrik Einstein (Anti-) Self-Dual Berdimensi Empat dengan Metode Cartan
Abstrak: Gravitational field equation can be formulated in differential forms (differential geometry), which describes gravity as a manifestation of the curvature of space-time. Curvature of space-time is characterized by a metric that satisfies the gravitational field equation. With differential forms it can be formulated the (anti-) self-dual Einstein equation, which is a modification of the Cartan structure in (anti-) self-dual basis. Calculation of (anti-) self-dual metric with (anti-) self-dual Einstein equation is simpler than the calculation using Christoffel symbols.
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