Judul: Productivity and Seasonal Pattern of Skipjack Tuna in Fisheries Management Area 572
Abstrak: Cakalang (Katsuwonus pelamis) merupakan ikan ekonomis penting di Wilayah Pengelolaan Perikanan (WPP) 572. Informasi mengenai produktivitas ikan cakalang penting sebagai dasar untuk meningkatkan efektivitas operasi penangkapan serta memperoleh keuntungan yang optimal. Penelitian ini bertujuan untuk menghitung produktivitas tangkapan atau catch per unit effort (CPUE) perikanan cakalang berdasarkan unit penangkapan ikan yang ada di Wilayah Pengelolaan Perikanan 572 yaitu handline, rawai tuna, purse seine, dan mini purse seine; menghitung produktivitas penangkapan secara temporal; dan menghitung indeks musim penangkapan (IMP) perikanan cakalang di WPP 572. Jenis data yang digunakan yaitu data sekunder dengan menggunakan metode analisis CPUE. Hasil penelitian produktivitas hasil tangkapan ikan cakalang unit penangkapan handline, rawai tuna, purse seine, dan mini purse seine tiap bulannya yaitu 6,89 ton/trip, 5,81 ton/trip, 5,91 ton/trip, 4,85 ton/trip, 6,93 ton/trip, 6,52 ton/trip, 7,29 ton/trip, 6,41 ton/trip, 5,29 ton/trip, 6,50 ton/trip, 5,92 ton/trip, dan 5,59 ton/trip. Produktivitas secara temporal 811,0563 ton pada musim barat; 665,75 ton pada musim peralihan bulan April-Mei; 885,3938 ton pada musim timur; dan 960,75 ton pada musim peralihan bulan Oktober-November. Nilai Indeks Musim Penangkapan (IMP) ikan cakalang di WPP 572 Musim penangkapan puncak terjadi pada bulan Mei, Juni, Juli, Oktober, Desember. Musim sedang terjadi pada bulan Januari, Februari, Maret, April, Agustus, September, November., Skipjack tuna is an economically important fish in Fisheries Management Area (WPP) 572. Skipjack tuna that are obtained from WPP 572 are mostly caught with handline, longline, purse seine, and mini purse seine. Information about skipjack tuna productivity is important to increase the effectiveness of catch and optimize profit. The purpose of this study was to calculate catch productivity or also known as catch per unit effort (CPUE) of skipjack tuna fisheries based on fishing unit gear around WPP 572, to calculate catch productivity temporally; and Fishing Season Index skipjack tuna fisheries in WPP 572. The type of data used was secondary data with the CPUE analysis method. The results of the study showed that the productivity of skipjack tuna catches based on fishing units handline, tuna longline, purse seine, and mini purse seine each month was 6,89 tons/trip; 5,81 tons/trip; 5,91 tons/trip; 4,85 tons/trip; 6,93 tons/trip; 6,52 tons/trip; 7,29 tons/trip; 6,41 tons/trip; 5,29 tons/trip; 6,50 tons/trip; 5,92 tons/trip; and 5,59 tons/trip. Productivity temporally 811,0563 tons in the west season; 665,75 ton during the transitional season from April to May; 885,3938 tons in the east monsoon; and 960,75 tons in the transitional season from October to November. Catching season index value for skipjack tuna in WPP 572 The peak fishing season occurs in May, June, July, October, December. Moderate seasons occur in January, February, March, April, August, September, November.
Keyword: CPUE, fisheries management area 572, fishing season index, productivity, skipjack

Judul: Projection Analysis of Skipjack Tuna (Katsuwonus pelamis) Landed at Cilacap Ocean Fishing Port
Abstrak: Ikan cakalang (Katsuwonus pelamis) salah satu komoditas utama di PPS Cilacap dimanfaatkan sebagai bahan baku untuk industri cold storage dan industri pengolahan. Jumlah ikan cakalang yang didaratkan mengalami fluktuasi selama periode 10 tahun terakhir. Tujuan penelitian ini adalah mendeskripsikan kondisi umum perikanan cakalang, menentukan metode proyeksi yang tepat dan memproyeksikan pendaratan ikan cakalang serta menyusun strategi pengadaan ikan cakalang untuk kebutuhan industri di PPS Cilacap. Metode penelitian adalah wawancara dengan teknik purposive sampling dan dianalisis menggunakan analisis deskriptif, analisis proyeksi dan analisis SWOT. Perikanan cakalang di PPS Cilacap didominasi kapal 21-30 GT dengan alat tangkap pancing ulur. Metode rata-rata bergerak tertimbang dengan bobot binomial 3 terpilih karena memiliki nilai MAPE dan MSE terkecil yaitu 37,67% dan 2.316,52. Proyeksi pendaratan ikan cakalang di PPS Cilacap tahun 2023 sebesar 4.831,92 ton. Rekomendasi strategi pengadaan ikan cakalang untuk industri di PPS Cilacap yaitu melakukan kerja sama dengan dengan pelabuhan lain dalam menunjang ketersediaan bahan baku, peningkatan dan pengembangan kualitas SDM perikanan, pengembangan fasilitas pelabuhan (kolam pelabuhan) untuk menunjang penambahan jumlah armada penangkapan ikan, dan peningkatan kinerja dalam monitoring dan pendataan logbook penangkapan ikan., Skipjack tuna (Katsuwonus pelamis), one of main commodities in PPS Cilacap used as a raw material for cold storage and processing industries. Its production has fluctuated over the last 10 years. This made the port manager unable to ensure the ability to produce fish for the coming year. The purpose of this study was to describe the general condition of skipjacks, determine the appropriate projection model and project the skipjack tuna landed and develop a strategy for procurement of skipjack’s industrial needs in PPS Cilacap. The research method is interview with purposive sampling technique, descriptive, projection, and SWOT analysis. Skipjack fishing in PPS Cilacap is dominated by 21-30 GT vessels with handline fishing gear. Weighted moving average method with binomial 3 was chosen because it has the lowest MAPE and MSE values (37.67% and 2.316,52). Projected production of skipjack at PPS Cilacap in 2023 is 4.831,92 tons. Recommendations for the skipjack procurement industrial strategy at PPS Cilacap are collaborating with other ports to support the availability of raw materials, improving and developing the quality of fisheries human resources, developing port facilities (port pools) to support the increasing of fishing fleets, and improving performance in monitoring and collecting fishing logbook data.
Keyword: Handline, PPS Cilacap, Projection, Skipjack tuna, Weighted moving average

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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