Judul: Produktivitas dan Musim Penangkapan Ikan Dominan Menggunakan Purse Seine di Pelabuhan Perikanan Pantai Tamperan Pacictan
Abstrak: Purse seine make a big contribution in landing pelagic fish catches at PPP Tamperan, Pacitan. Decreased fishing production is thought to be due to overfishing and the lack of information about the seasonal pattern of each type of fish. Purse seine catches landed at PPP Tamperan are dominated by pelagic fish belonging to important economic value. Where the fish are known to the public and caught in seasonal conditions. The research aims to calculate the productivity of fishing using purse seine and determine the pattern of the dominant fishing season caught on purse seine fishing gear at the Tamperan Beach Fishing Port, Pacitan. Make a map of the distribution of fishing areas. The research used is a survey method with interviews with fishermen and several staff at PPP Tamperan. The data generated are in the form of catch production data, types of fish, fishing trips, fishing coordinates and other data. Productivity data was calculated according to KEPMEN N0.61/2014 and fish season patterns were calculated using time series and moving average methods and coordinate point data was processed using ArcGIS 10.3. During the last 5 years the production of catches landed at PPP Tamperan are skipjack, mackerel scad and tuna. The amount of production tends to decrease as well as the level of productivity. Factors in determining productivity include the number of crew members, fishing trips, ship GT, ship engine PK, and net length. Purse seine productivity based on the number of fishing trips (ton/trip) has increased while others have decreased. Purse seine operations in Pacitan Regency which are good for catching occur in March, May-September (skipjack), December-February, April-May (mackerel scad), and January-April, July, August (tuna). The fishing potential area changes in line with the changing seasons. This season is one of the factors affect of the oceanographic parameters that become habitat of fish., Purse seine memberikan kontribusi yang besar dalam mendaratkan hasil tangkapan ikan pelagis di PPP Tamperan, Pacitan. Produksi penangkapan menurun diduga karena telah terjadi penangkapan berlebih serta sedikitnya informasi mengenai pola musim setiap jenis ikan. Hasil tangkapan Purse seine yang didaratkan di PPP Tamperan didominasi oleh ikan pelagis yang tergolong ke dalam nilai ekonomis penting. Dimana ikan tersebut dikenal masyarakat dan tertangkap dalam kondisi musiman. Penelitian ini bertujuan untuk menghitung produktivitas penangkapan ikan menggunakan purse seine dan menentukan pola musim penangkapan ikan dominan yang tertangkap pada alat tangkap purse seine di Pelabuhan Perikanan Pantai Tamperan, Pacitan. Membuat peta sebaran daerah penangkapan ikan. Metode yang digunakan yaitu metode survei dengan wawancara terhadap nelayan dan beberapa staf di PPP Tamperan. Data yang dihasilkan berupa data produksi hasil tangkapan, jenis ikan, trip penangkapan, data koordinat penangkapan ikan dan data lainnya. Data produktivitas dihitung sesuai dengan KEPMEN N0.61/2014 dan pola musim ikan dihitung menggunakan deret waktu dan metode rata-rata bergerak serta data titik koordinat diolah menggunakan ArcGIS 10.3. Selama 5 tahun terakhir produksi hasil tangkapan yang didaratkan di PPP Tamperan yaitu ikan calakang, layang, dan tuna. Jumlah produksinya cenderung mengalami penurunan begitupun dengan tingkat produktivitasnya. Faktor dalam menentukan produktivitas meliputi jumlah ABK, Trip penangkapan, GT kapal, PK mesin kapal, dan panjang jaring. Produktivitas purse
Keyword: Purse Seine, Productivity, Dominant Fishing Season, Pacitan

Judul: Perfomance of the Mini Purse Seine in the Morning and Evening at the Coastal Fishing Port Larangan Tegal Distrcit
Abstrak: Alat tangkap purse seine merupakan alat tangkap dominan yang ada di PPP Larangan. Waktu operasi penangkapan yang digunakan oleh nelayan terdiri atas dua yaitu penangkapan pagi dan penangkapan malam. Diantara dua metode penangkapan ini belum diketahui metode mana yang lebih efektif dalam melakukan kegiatan penangkapan, yang mana berpengaruh terhadap keberlanjutan perikanan sehingga diperlukan penelitian ini. Tujuan penelitian ini adalah mendeskripsikan perikanan purse seine, menghitung nilai produktivitas hasil tangkapan purse seine pada penangkapan pagi dan malam serta membandingkan tingkat efektivtas purse seine pada penangkapan pagi dan malam. Metode yang digunakan dalam penelitian ini yaitu metode observasi dan survei dengan analisis deskriptif, analisis produktivitas menurut Kepmen KP No.61 tahun 2014 dan analisis dekriptif efektivitas. Hasil penelitian menunjukkan bahwa kedua metode penangkapan purse seine menggunakan sistem one day fishing. Jenis hasil tangkapan utamanya yaitu ikan teri jawa, ikan kembung, ikan tembang, ikan peperek, cumi-cumi dan udang. Nilai produktivitas hasil tangkapan pagi yang sudah memenuhi standar hanya faktor produksi GT kapal dan trip penangkapan, sedangkan nilai produktivitas hasil tangkapan malam belum ada faktor produksi yang memenuhi standar. Penangkapan pagi lebih efektif dibandingkan dengan penangkapan malam dilihat dari nilai produktivitasnya., Purse seines are dominant fishing gear in Coastal Fishing Port Larangan. There are two methods that fishers use during fishing catch activity, in the morning and night. Between these two fishing methods, it is unknown which is more effective in carrying out fishing catch activities, which affects the sustainability of the fisheries, so this research is needed. This research aims to describe types and amounts of fish caught in purse seine, to compare productivity level and effectivities of fishing catch activity in morning and night. Data collection techniques included observation and survey with descriptive, productivity analysis by Kepmen KP No.61 of 2014 and descriptive analysis for effectivity. Fishing gear used is purse seine with one day trip. Fish caught using purse seine as the fishing gear were anchovy, mackerel, tembang, peperek, squid and shrimp. The morning catch’s productivity that has meet the standard is only the production factors GT ship and fishing trips, while the productivity value of evening catch has no production factors that meet the standard. Fishing catch activity in the morning was more effective than fishing catch activity at night compared to productivity level.
Keyword: catch, effectiveness, productivity, purse seine

Judul: Grup dan Homomorfisma Grup pada Rubik Revenge
Abstrak: Rubik cube is a kind of puzzle game. A player must arrange rubik sides, which have been disordered, back to the position where every side has the same colour. This paper does not focus on the settlement solution, but instead on proving the existence of a group homomorphism between rubik movement group and S96 symmetric permutation group in rubik revenge. Firstly, it has been proved that rubik movement set is a group. Then, it also has been proved that the M set, which contains numeric labels of 1 until 96 in cubinos sides, is S96 symmetric permutation group.
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