Judul: Modification of  Fishing line (jantang)  the Catch of the Asian Redtail Catfish (Mystus nemurus) in Lubuk Labu, West Sumatra
Abstrak: Penangkapan ikan baung menggunakan jantang banyak digunakan oleh masyarakat Lubuk Labu. Jantang merupakan alat tangkap kusus menangkap baung yang bersifat pasif atau menetap. Namun masih belum optimal, sehingga peneliti melakukan percobaan membuat jantang modifikasi untuk meningkatkan hasil tangkapan. Penelitian ini bertujuan untuk mengetahui komposisi hasil tangkapan dan efektivitas jantang rendam serta mengetahui kelayakan usaha jantang. Metode yang digunakan adalah metode experimental fishing yang dilakukan di Perairan Lubuk Labu, Dharmasraya, Sumatera Barat. Data komposisi hasil tangkapan berupa jumlah dan bobot hasil tangkapan. Efektivitas jantang berupa hasil perbandingan hasil tangkapan. Data ukuran panjang ikan dan bobot berupa panjang total, panjang cagak, panjang baku dan bobot ikan. Data kelayakan jantang berupa total biaya dan total penerimaan. Hasil penelitian komposisi jumlah hasil tangkapan utama jantang modifikasi 67,5 % dan komposisi jumlah hasil tangkapan jantang kontrol sebesar 30,55 %. Panjang total ikan baung hasil tangkapan jantang modifikasi secara keseluruhan rata-rata 26,69 cm dengan bobot rata-rata 149,48g dan panjang total hasil tangkapan jantang kontrol 24,47 cm dengan nilai rata-rata bobot 133,36 g. Ukuran layak tangakap jantang modifikasi dan jantang kontrol sebesar 69 % berbanding 31 %.Tingkat keefektifan hasil tangkapan jantang modifikasi sebesar 63,44% dan nilai keefektifan hasil tangkapan jantang kontrol sebesar 25,59%, menunjukkan tingkat keefektifan jantang modifikasi lebih besar dari jantang kontrol. Jantang modifikasi memperoleh nilai revenue-cost ratio lebih besar, sehingga jantang modifikasi layak untuk dikembangkan., Fishing Asian redtail catfish (Mystus nemurus) using the fishing line is widely used by the Lubuk Labu community. A fishing line is a special fishing gear to catch Mystus nemurus that is passive or settled, therefore it is still not optimal. The experiment was conducted by modifications of the construction line to improve catches. The objectives of the study are to determine the catch composition and the effectiveness and determine the feasibility of the fishing line. The experimental fishing of fishing line was applied in Lubuk Labu lakes, Dharmasraya, West Sumatera. The catch composition such as length and weight was monitored during the experiment. The effectiveness of the fishing line was the results of the comparison of catches. The economic feasibility was presented in the costs and total revenues. The results showed that the catch composition of the modified fishing line of 67.5% significantly higher than that of the control of 30.55%. The total length of the Mystus nemurus catches by modified fishing line was 26.69 cm on averages, with an average weight of 149.48 g. The total length of the control was 24.47 cm with an average weight of 133.36 g. A decent size capture of the modification fishing line was 69% and the control was 31%. The effectiveness of the modified fishing line was 63.44% higher than the control was 25.59%. The modified fishing line gets a higher revenue-cost ratio value so that the modification is can be developed.
Keyword: Asian redtail catfish, catches, fishing line effectiveness, Lubuk Labu, modified fishing line

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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