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: Utilization of Bait Bag Boosters in Trammel net Fishing Gear  in Palabuhanratu Bay
Abstrak: Hasil tangkapan trammel net di Palabuhanratu cenderung mengalami penurunan. Salah satu alternatif yang dapat digunakan adalah dengan penggunaan umpan yang mengandung asam amino untuk membantu penangkapan sebagai perangsang utama dalam proses penciuman ikan. Namun belum ada informasi mengenai penggunaan umpan pada trammel net. Penelitian ini bertujuan membandingkan komposisi hasil tangkapan, menentukan pengaruh penggunaan umpan dan mengestimasi penerimaan trammel net perlakuan dan kontrol. Penelitian dilakukan di Teluk Palabuhanratu menggunakan metode experimental fishing sebanyak 30 setting. Hasil tangkapan pada piece trammel net perlakuan sebesar 56,49 kg dan piece kontrol sebesar 37,30 kg. Hasil tangkapan dominannya yaitu udang jerbung (Penaeus merguensis), rajungan bintang (Portunus sanguinolentus), dan pepetek (Leiognathus equulus). Produktivitas per-piece perlakuan lebih besar dibandingkan kontrol dengan masing-masing sebesar 0,47 kg/piece dan 0,32 kg/piece. Persentase produksi trammel net piece perlakuan lebih besar dibandingkan piece kontrol dan terjadi peningkatan penerimaan hasil tangkapan jaring trammel net perlakuan terhadap kontrol., Trammel net catches in Palabuhanratu have declined significantly. One alternative that can be used as solution is using bait containing amino acids to help catch the fish by stimulate fish's olfactory sensor. There is still no information regarding the use of bait in trammel nets. This research aims to compare the composition of catches, determine the effect of using bait and estimate the revenue beetween trammel nets experimental and control. The research was conducted in Palabuhanratu Bay using experimental fishing methods with the total 30 settings. The total catch experimental trammel net piece was 56.49 kg and the control piece was 37.30 kg. The dominant catches for experimental nets are jerbung shrimp (Penaeus merguensis), star crab (Portunus sanguinolentus), and pepetek (Leiognathus equulus). The productivity per piece of the experimental net was greater than the control with respective values of 0.47 kg/piece and 0.32 kg/piece. The percentage of production of treated trammel net pieces was greater than that of the control pieces and there was an increase in revenue from the treated trammel net net catches compared to the control.
Keyword: bait bags, Palabuhanratu Bay, squid, trammel net, 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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