Judul: Study on the Aggregation Mechanism of Small Pelagic Fish around Rumpon and Its Fisheries of Development in Pasauran Waters, Province of Banten
Abstrak: Rumpon (Fish Aggregating Device) is an auxiliary gear operated to attract and aggregate fish. The use of rumpon for fishing activities has improved the effectivity and efficience of several fishing gear. However, the fast growing of rumpon utilization has raised a great concern on the sustainability of the fish resources. The rumpon management for responsible fisheries should consider the aspects of biology, location, environment, fishing gear, social and economic. The aggregation mechanism of pelagic fish around rumpon has not fully understood and its usage in a responsible manner further elaboration also needed. For this purpose, analysis were conducted on the anatomy and morphology of 3 kinds of rumpon's attractor materials, i.e Cocos nucifera, NypaJLuctican and Areca catechu leaves. The genus composition of plankton and periphyton were identified, obse~-vationosn fish behavior, stomach content, Gonado Somato Index were carried out. Experimental fishing was conducted by using payang bugis. The result show that the Cocos nucifera leaves are the best attractor material based on the thickness of cuticle, thickness of epidermis, density of periphyton, and number of fish species in all seasons. Further, the Gonado Somato Index (GSI) of small pelagic fish were caught around rumpon are GSI I 4%, GSI I1 33% and GSI I11 35%. This result indicated that the small pelagic fish caught around rumpon are 'immature fish' and could cause recruitment overfishing. The periphyton in the attractors were also found in the stomach content of 6 small pelagic species fish around rumpon. The aggregation mechanism aggregation of pelagic fish around rumpon, therefore, more likely caused by food chain process, beginning with colonization of microorganism on leaves attractor, aggregation of micro organism prey around rumpon, aggregation of filtering and predator fish. Next, application of Hilborn and Medley Model on the rumpon fisheries in Pasauran waters revealed that the optimum number of rumpon is 4 units, for the water area of 11 5.4 km2, and the mean distance of each rumpon is 5 km (about 3 nautical miles). The 4 units rumpon in Pasauran waters could render 154.4 ton of total catch/year with a profit of 38.2 million rupiahlyear. The rumpon fisheries in Pasauran have not met with the criteria of the Code of Conduct for Responsible Fisheries. The GSI of small pelagic fish were caught around rumpon indicated that the rumpon could cause recruitment overfishing. Rationalization of the existing 45 to 4 units rumpon in Pasauran waters is recommended to ensure the sustainability of the fisheries.
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Judul: Studi tentang kepadatan ikan pelagis di sekitar rumpon di Perairan Pasauran, Banten
Abstrak: Penggunaan rumpon sebagai alat bantu penangkapan ikan telah lama dikenal oleh nelayan kita baik berupa rumpon laut dangkal maupun rumpon laut dalam. Rumpon merupakan alat bantu penangkapan ikan yang digunakan untuk mengumpulkan ikan. Menurut Monintja (1993), manfaat rumpon sebagai alat bantu penangkapan ikan adalah: (1) untuk mengurangi waktu dan bahan bakar dalam pengejaran kelompok ikan, (2) menaikkan jumlah hasil tangkapan per satuan upaya penangkapan, (3) meningkatkan mutu hasil tangkapan ditinjau dari spesies dan komposisi ukuran. Pemanfaatan terhadap sumberdaya ikan terutama sumberdaya perikanan pelagis dapat dilakukan secara optimal apabila data keberadaan dan kepadatan sumberdaya ikan diketahui secara akurat sehingga eksploitasi dapat dilakukan secara tepat dan tidak membahayakan kelestarian sumberdaya ikan. Salah atu metode yang sedang dikembangkan untuk mengetahui kepadatan dan keberadaan ikan adalah teknologi akustik. Penelitian ini dilaksanakan di wilayah perairan Selat Sunda tepatnya di daerah Pasauran dimana di perairan tersebut nelayan menggunakan alat bantu penangkapan berupa rumpon. Penelitian ini dilaksanakan pada bulan Agustus sampai Oktober 2002. Pengambilan data akustik dilakukan dua kali, yaitu pada tanggal 8 Agustus dan 9 Agustus 2002 pada waktu siang hari jam 10.00 sampai jam 12.00. Pengamatan pertama dan kedua, area survey dibagi menjadi 21 ESDU.
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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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