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: Penggunaan Rumpon Hanyut Berumpan terhadap Hasil Tangkapan Pancing Ulur di Perairan Teluk Palabuhanratu
Abstrak: Minimnya pengetahuan teknologi nelayan pancing ulur Palabuhanratu membuat produktivitas hasil tangkapan semakin rendah, sehingga untuk meningkatkan produktivitas tersebut perlu adanya introduksi alat bantu penangkapan berupa kombinasi rumpon dan umpan. Tujuan penelitian ini yaitu membuat rancang bangun rumpon hanyut berumpan sebagai perlakuan, membandingkan komposisi hasil tangkapan pancing ulur perlakuan dan kontrol, menentukan pengaruh penggunaan rumpon hanyut berumpan, dan menentukan produktivitas pancing ulur perlakuan dan kontrol. Penelitian ini dilaksanakan di Perairan Teluk Palabuhanratu menggunakan metode experimental fishing dengan 16 trip sebagai ulangan. Hasil penelitian ini menyatakan bahwa hasil tangkapan pada pancing ulur perlakuan lebih unggul dibandingkan kontrol. Selama 16 ulangan hasil tangkapan pancing ulur perlakuan sebesar 98,67 kg sedangkan kontrol sebesar 62,34 kg. Berdasarkan hasil uji analisis Mann-Whitney perlakuan menggunakan rumpon hanyut berumpan memberikan pengaruh nyata terhadap jumlah ekor dan berat hasil tangkapan. Produktivitas pancing ulur perlakuan memiliki nilai yang lebih besar dibandingkan pancing ulur kontrol, yaitu masingmasing sebesar 6,17 kg/trip dan 3,90 kg/trip dengan persentase rata-rata produksi pancing ulur perlakuan meningkat sebesar 58,28%. Pendapatan bersih pancing ulur perlakuan sebesar Rp51.020,00 dan kontrol Rp21.416,00., The lack of technological knowledge for handline fishermen in Palabuhanratu has resulted in lower catch productivity. To increase the productivity of the hand line, it is necessary to introduce fishing aids in the form of a combination of FADs and bait. This study aimed to design and build baited drift FADs as a treatment, to compare the catch composition of treated and control handlines, to determine the effect of using baited drift FADs, and to determine the productivity of treated and control handlines. This research was conducted in the waters of Palabuhanratu Bay using the experimental fishing method with 16 trips as repetition. The results of this study stated that the catch on the treatment line was superior to the control. For 16 repetitions, the catch of the treatment line was 98.67 kg, and the control was 62.34 kg. Based on the results of the Mann-Whitney analysis test, the treatment using baited drift FADs significantly affected the number of tails and the weight of the catch. The productivity of the treated handline had a more excellent value than the control handline, which was 6.17 kg/trip and 3.90 kg/trip, respectively, with an average percentage of treated handline production increasing by 58.28%. The net income of the treatment handline was Rp51.020,00, and that of the control was Rp21.416,00.
Keyword: attractor, baited, FADs, handline, Palabuhanratu Bay

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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