Judul: Penggunaan Cacing Tanah (Lumbricus  rubellus) pada Umpan Vertikal terhadap Hasil Tangkapan Bagan Apung di  Perairan Teluk Palabuhanratu
Abstrak: Umpan vertikal digunakan sebagai alat bantu penangkapan ikan pada alat tangkap bagan apung. Umpan yang berasal dari laut tidak selalu tersedia selama musim penangkapan sehingga digunakan atraktor berupa cacing tanah (Lumbricus rubellus) yang berasal dari darat dan tersedia sepanjang tahun. Penelitian ini bertujuan untuk membandingkan komposisi hasil tangkapan bagan apung perlakuan dengan bagan apung kontrol, mengetahui pengaruh penggunaan umpan vertikal dan menentukan frekuensi hauling bagan apung perlakuan. Metode yang digunakan dalam penelitian ini adalah experimental fishing dengan pengulangan sebanyak 20 kali. Analisis data yang dilakukan adalah analisis deskriptif dan analisis statistik yaitu uji mann-whitney. Hasil penelitian menunjukkan bahwa terdapat 10 jenis ikan hasil tangkapan pada bagan apung perlakuan dan 8 jenis ikan pada bagan apung kontrol. Penggunaan atraktor cacing tanah sebagai umpan alternatif berpengaruh nyata terhadap berat total hasil tangkapan bagan apung dengan nilai signifikansi uji mann-whitney sebesar 0,014. Berat total hasil tangkapan pada bagan apung perlakuan adalah 944,2 kg dan pada bagan apung kontrol seberat 435.2 kg. Frekuensi hauling bagan apung perlakuan selama 20 trip penangkapan sebanyak 118 kali dan bagan apung kontrol sebanyak 101 kali., Vertical baits are used as auxiliary gear in floating lift nets. The bait that comes from the sea is not always available during the fishing season, so an attractor called earthworms (Lumbricus rubellus) is used, which comes from land and is available throughout the year. The purposes of this study are to compare the caught fish of the lift net with vertical bait and the controllable lift net (without vertical bait), to determine the effect of using vertical bait and determine the hauling frequency of the lift net with vertical bait. The method used in this research was experimental fishing with 20 repetitions. The data analysis used was descriptive and statistical, namely the Mann-Whitney test. The results show that the lift net with bait caught ten fish species, and the lift net without bait only caught eight species of fish. The use of an earthworm attractor as an alternative bait had a significant effect on the total weight of the floating lift net catch, with the significance value of the Mann-Whitney test of 0.014. The total weight of the catch on the floating lift net with vertical bait was 944.2 kg, and on the controlled floating lift net was 435.2 kg. The total number of hauling on the floating lift net with vertical bait for 20 trips was 118 times, and the controlled floating lift net was 101 times.
Keyword: liftnet, earthworm, bait, vertical, palabuhanratu

Judul: Penggunaan Kombinasi Atraktor Rumpon dan Umpan Vertikal terhadap Hasil Tangkapan Bagan Apung di Palabuhanratu
Abstrak: Penelitian penggunaan kombinasi atraktor rumpon dan umpan vertikal berbahan ikan rucah dan larutan cumi-cumi untuk memperkuat fungsi cahaya lampu dalam memikat dan mengumpulkan ikan agar lebih efektif. Tujuan penelitian untuk membandingkan komposisi hasil tangkapan bagan apung perlakuan dan kontrol, menentukan pengaruh penggunaan atraktor rumpon dan umpan vertikal terhadap jumlah total hasil tangkapan, menentukan frekuensi hauling, dan menentukan produktivitas bagan apung perlakuan dan kontrol. Penelitian ini menggunakan metode eksperimental fishing dengan mengikuti operasi penangkapan selama 20 trip. Hasil tangkapan pada bagan apung perlakuan sebesar 964,2 kg dan bagan apung kontrol sebesar 445,4 kg dengan rata-rata berat total hasil tangkapan pada bagan apung perlakuan yaitu 48,2±13,2 sedangkan kontrol yaitu 22,2±3,1. Hasil tangkapan dominan pada penelitian ini adalah semar (Mene maculata), tembang (Sardinella gibbosa), pepetek (Leiognathus equulus), teri (Stelephorus sp.), dan cumi (Loligo sp.). Penggunaan atraktor rumpon dan umpan vertikal berpengaruh nyata terhadap hasil tangkapan bagan apung dan frekuensi hauling bagan apung perlakuan berjumlah 110 kali, sedangkan pada bagan apung kontrol yang hanya berjumlah 76 kali. Penggunaan umpan membantu kenaikan persentase produksi tangkapan bagan apung perlakuan meningkat sebesar 116,5% jika dibandingkan dengan bagan apung kontrol. Produktivitas bagan apung perlakuan sebesar 48 kg/trip dan 8,3 kg/haul, sedangkan kontrol yaitu 22,3 kg/trip dan 5,0 kg/haul., The study used a combination of FADs attractors and vertical baits made from trash fish and squid solution to strengthen the function of light in attracting and gathering fish to make it more effective. This study aimed to compare the composition of the catch controlled variable (commercial floating lift nets) and lift net with vertical baits, determine the effect of using FADs and vertical baits attractors on the total catch, determine to haul frequency of the lift net, and determine the productivity of treatment and control lift net. The research used experimental fishing methods by following fishing operations for 20 trips. The catch on the treated lift net was 964,2 kg, and the control lift net was 445,4 kg, with the average total weight of the catch on the treated lift net being 48,2±13,2 while the control was 22,2±3,1. The dominant catches in this study were moonfish (Mene maculata), gold stripe sardinella (Sardinella gibbosa), ponyfish (Leiognathus equulus), anchovy (Stolepthorus sp.), and squid (Loligo sp.). Using FADs and vertical bait attractors significantly affected the total catch and hauling frequency with 110, while in the controlled variable, which is only 76 times. The use of bait helped increase the percentage of production of the treated lift net by 116,5% compared to the control lift net. The productivity of the treated lift net was 48 kg/trip and 8.3 kg/haul, while the control was 22.3 kg/trip and 5.0 kg/haul.
Keyword: Lift net, attractor, trash fish, total catch, hauling

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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