Judul: komposisi hasil tangkapan, pola musim, dan analisis finansial bagan perahu di pelabuhan perikanan pantai carocok tarusan
Abstrak: Penangkapan ikan menggunakan alat tangkap bagan perahu banyak dilakukan oleh nelayan di PPP Carocok Tarusan. Tujuan penelitian adalah mengidentifikasi komposisi hasil tangkapan bagan perahu, pola musim hasil tangkapan bagan perahu, dan menentukan kelayakan finansial operasi penangkapan bagan perahu. Metode penelitian yang digunakan adalah observasi dan mengambil sampel nelayan yang diwawancarai menggunakan teknik purposive sampling. Analisis data yang digunakan yaitu komposisi hasil tangkapan dalam bentuk grafik, analisis data pola musim penangkapan menggunakan analisis deret waktu dengan metode rata-rata bergerak dan analisis kelayakan finansial. Hasil penelitian menunjukkan bahwa hasil tangkapan utama memiliki persentase 84,9%, hasil tangkapan sampingan memiliki persentase 15,1% dan Usaha perikanan tangkap bagan perahu di Carocok Tarusan dikatakan layak dengan nilai R/C sebesar 1,61 dan PP 8 bulan. Hasil tangkapan utama meliputi ikan tongkol (Auxis thazard), teri (Stolephorus indicus), layang (Decapterus macrosoma), kembung (Rastrelliger brachysoma), dan cumi-cumi (Loligo sp.).
Keyword: bagan perahu, catch, Carocok Tarusan Fishing Port, seasonal pattern

Judul: Characteristics of the Boat-operated Lift Nets  Based at Carocok (Tarusan) Fishing Port, West Sumatra
Abstrak: Bagan perahu merupakan alat tangkap dominan yang beroperasi di perairan sekitar PPP Carocok (Tarusan). Hal ini berpotensi mempengaruhi ekosistem, khususnya ikan terget di daerah penangkapan ikan. Penelitian ini bertujuan mendeskripsikan karakteristik perikanan bagan perahu yang berbasis di PPP Carocok (Tarusan), Pesisir Selatan; dan menganalisis ikan target dan tingkat trofik hasil tangkapan bagan perahu di lokasi studi. Hasil penelitian menunjukkan bahwa bagan perahu di perairan Carocok (Tarusan) memiliki dua kelompok ukuran yaitu > 21 GT dan ≤ 21 GT. Ikan target tangkapan bagan perahu ≤ 21 GT adalah ikan teri (Stolephorus commersonnii) dan bagan perahu > 21 GT adalah ikan tongkol (Auxis thazard) dan ikan layang biru (Decapterus macarellus). Pola pertumbuhan ikan teri bersifat alometrik negatif, sementara ikan tongkol memiliki sifat isometrik. Ukuran layak tangkap ikan teri sebesar 65,7% tertangkap, ikan tongkol sebesar 65% tertangkap, dimana didominasi oleh tingkat trofik ke 3 (omnivora yang cenderung pemakan hewan) pada hasil tangkapannya., Boat-operated lift nets is the dominant fishing gear operating in the fishing ground of the fisher based in the coastal fishing port of Carocok (Tarusan). It potentially affects the ecosystem, mainly fish targets in the fishing ground. This study aims to describe the characteristics of the boat-operated lift nets fishery based at the coastal fishing port of Carocok (Tarusan), Pesisir Selatan; and to analyze fish target and trophic levels caught by the boat in the study area. The results of this study showed that the boat-operated lift nets in the waters had two size groups of the fishing vessels, namely > 21 GT and ≤ 21 GT. The target fish caught by boat-operated lift nets ≤ 21 GT was commerson's anchovy (Stolephorus commersonnii), while > 21 GT was frigate tuna (Auxis thazard) and mackerel scad (Decapterus macarellus). The commerson's anchovy growth pattern in the study area indicated a negative allometric, while frigate tuna was isometric. About 65.7% of the commerson's anchovy catch was higher than biological allowable catch size (length at first maturity), while the frigate tuna was about 65% of the total caught. Additionally, the catch of the boat-operated lift net was dominated by the group of fish in the trophic level 3 (omnivores with a preference for animals).
Keyword: boat-operated lift nets, biological allowable catch size, fish target, trophic level

Judul: A Continuous Vaccination Strategy in the SVIR Epidemic Model
Abstrak: Vaccination is conducted to minimize the spread of a disease. The vaccination is usually done several times within a fixed time interval. In the SVIR model, it is assumed that individuals do not get immediate immunity following a vaccination program. So according to process of vaccination on SVIR model, there are two strategies, i.e. the continuous vaccination strategy (CVS) and the pulse vaccination strategy (PVS). In this study, only the CVS strategy in epidemic model SVIR is considered. Results of the study indicate that dynamics of the CVS system depends on the basic reproductive number. If the basic reproductive number is less than one, then the disease-free fixed point is asymptotically stable. It means that the disease will eventually disappear from the population. Conversely, if the basic reproductive number is greater than one, then the endemic fixed point is asymptotically stable, which means that the disease will remain exist in the population. Simulation result shows that the vaccination would minimize the spread of disease by reducing the basic reproductive number. If the time for the vaccinated recipients to obtain the immunity, as well as a possibility of vaccinated recipients to be infected are neglected, then the disease will be eradicated. This condition is called an over-evaluating effect of vaccination.
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