Judul: Technical Performance and Effectiveness of Using Bait on the Dragon Traps (Accordion-shaped Traps) in Bondet Waters Cirebon West Java
Abstrak: Hasil tangkapan yang diperoleh nelayan sedikit menyebabkan pendapatan nelayan tidak dapat menutupi kebutuhan sehari-hari, sehingga diperlukan cara untuk meningkatkan produktivitas bubu naga, salah satu caranya dengan penggunaan umpan. Penelitian ini bertujuan untuk mendeskripsikan unit penangkapan bubu naga, menghitung komposisi hasil tangkapan yang menggunakan umpan dan tidak menggunakan umpan pada bubu naga, dan menghitung pendapatan usaha perikanan bubu naga. Metode yang digunakan dalam penelitian adalah experimental fishing dengan menggunakan umpan ikan rucah sebanyak 20 kali ulangan (trip) di lapangan. Hasil penelitian menunjukkan bahwa dimensi bubu naga yang digunakan dalam penelitian (50 cm x 37 cm x 35 cm) dengan panjang bubu yaitu 10 m. Total hasil tangkapan bubu naga kontrol atau tanpa umpan yaitu 82,53 kg (672 ekor) dengan 11 jenis ikan dan total hasil tangkapan bubu naga perlakuan 131,721 kg (904 ekor) dengan 11 jenis ikan. Usaha perikanan bubu naga layak untuk dilanjutkan. Umpan ikan rucah dapat dijadikan sebagai implementasi teknologi tepat guna untuk alat tangkap bubu naga karena hasil tangkapan bubu naga yang menggunakan umpan lebih banyak jika dibandingkan dengan bubu naga yang tidak menggunakan umpan. Selain itu, Ikan rucah juga lebih mudah didapatkan dan harganya terjangkau., The catch obtained by fishers is few cause make fishers income not able to cover their daily needs, so way required to increase the productivity of dragon traps, the one way to use bait. This study aims to describe the dragon traps fishing unit, counting species caught in dragon traps using bait and without bait, and counting the revenue of the dragon traps fishing business. This research method was experimental fishing with 20 repetitions using trash fish bait operations in the field. The results show that the size of the dragon traps used in the research (50 cm x 37 cm x 35 cm) with a length trap of 10 m, control dragon traps or without bait 82.53 kg (672 individual of fish) with 11 species and the total catch of the treated dragon traps was 131.721 kg (904 individual fish) with 11 species. The dragon trap fishing business deserves to be continued. Because dragon traps with bait catch more fish than dragon traps without bait, trash fish can be used as a suitable technology applied for dragon traps. In addition, trash fish are readily available and affordable.
Keyword: bait, dragon traps, profit, total catch, trash fish

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: Penentuan Nilai Eigen dan Vektor Eigen dari Matriks Tridiagonal 2-Toeplitz dengan Pendekatan Polinomial Chebyshev
Abstrak: The eigenvalues and eigenvectors of a matrix can be determined by finding its characteristic polynomials. The characteristic polynomials of a tridiagonal 2-Toeplitz matrix is shown to be closely connected to polynomials which satisfy the Chebyshev recurrence relationship. If the order of the matrix is odd, then the eigenvalues are found explicitly in terms of the Chebyshev zeros and the eigenvectors are found in terms of the polynomials satisfying the recurrence relationship. For even ordered matrices, the situation is more complicated. The problem in these cases is that although the Chebyshev recurrence formula is still applied, its initial values are not generating Chebyshev polynomials
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