Judul: Analisis kapasitas penangkapan (fishing capacity) pada perikanan purse seine di Kabupaten Aceh Timur Provinsi Nanggroe Aceh Darussalam
Abstrak: Perhitungan kapasitas penangkapan ikan menjadi isu penting pada upaya pengelolaan perikanan yang berkelanjutan. The Code of Conduct for Responsible Fisheries (CCRF) yang disusun oleh FAO (1995) mengajak kepada seluruh negara untuk mencegah lebih tangkap (overfishing) dan menghindari kelebihan kapasitas penangkapan ikan. Kabupaten Aceh Timur menjadi pangkalan perikanan purse seine dengan aktifitas upaya penangkapan tertinggi di Provinsi Nanggroe Aceh Darussalam. Kegiatan perikanan purse seine di Kabupaten Aceh Timur berpusat di Pelabuhan Perikanan Pantai (PPP) Idi Rayeuk. Purse seine merupakan alat tangkap yang mampu menangkap ikan-ikan pelagis dalam jumlah yang besar dalam sekali beroperasi. Oleh sebab itu peningkatan upaya penangkapan alat tangkap ini diduga dapat mempengaruhi stok ikan-ikan pelagis di perairan tersebut. Kajian kapasitas penangkapan di Kabupaten Aceh Timur belum pernah dilakukan, sehingga sulit untuk merumuskan program pengelolaan sumberdaya ikan yang berkelanjutan. Oleh karenanya sangat penting untuk memperoleh informasi tersebut melalui penelitian tentang “analisis kapasitas penangkapan (fishing capacity) pada perikanan purse seine di Kabupaten Aceh Timur Provinsi Nanggroe Aceh Darussalam”. Secara umum penelitian ini bertujuan untuk mengukur kapasitas penangkapan purse seine di Kabupaten Aceh Timur dan mengestimasi nilai maximum sustainable yield (MSY) ikan pelagis yang menjadi target penangkapan dengan purse seine.
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Judul: Fisheries Development Analysis of Purse Seine Fisheries Aceh Besar District
Abstrak: Purse seine is one the productive fishing gear for fishing pelagic fishes. Fishing capacity is one the important issue in sustainable fisheries. This study aimed to measure fishing capacity of purse seine in Aceh Besar district, estimated the maximum economic yield (MEY) the targeted pelagic fishes, and formulate management strategies purse seine in the district of Aceh Besar. Fishing capacity was analyzed using the data envelopment analysis (DEA) method based on fishing capacity efficiency of monthly total catch as single output, from September 2009 to August 2010. Fishing vessel was used as decision making unit (DMU). Fixed input consists gross tonnage (GT), engine horse power (HP) and length of webb. Variable input consists number of crew, lamp power (watt), hold capacity (ton), and number of trip. The result showed that fishing capasity, 17 vessels reached optimum (CU=1), and fishing capacity of purse seine was 257 ton/year/unit. Thus bioeconomic analysis of pelagic fishes showed that MEY reached at 3,753.37 ton/year and optimum effort at 8,623 trip/year with total cost Rp 34,992,314,500 year and total revenue Rp 51,643,083,629. Management strategy for purse seine fishery in Aceh Besar district is the development of technology, human resource development and the role of institutions such as institutions laot commander.
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Judul: Hamiltonian formulation for linear waves motion in two layers fluid
Abstrak: The surface wave could be considered as a wave that separates two fluids, namely water and air. Based on this assumption, it is introduced the interfacial wave, a wave between two layers of fluid with different density. The formulation of interfacial waves motion begins with deriving the base equation of irrotational ideal fluid. Furthermore, according to irrotational fluid assumption, the base equation can be stated in velocity potential. In this derivation, the fluids domain is assumed to be restricted by rigid lid boundary conditions, both at the upper and lower limit. Therefore, the interfacial waves motion can be explained in a hamiltonian formulation. In the hamiltonian formulation, total energy is defined as the sum of kinetic and potential energy. The hamiltonian system is obtained from reduction of kinetic energy by using the Dirichlet Neumann Operator. The resulted kinetic energy equation is nonlinear. Therefore, this form is linearized by first part of the Taylor expansion. This linearization gives a dispersion relation of linear wave. Based on this dispersion relation, the phase speed of the linear wave depends on the density ratio of the two layers fluid.
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