Judul: Productivity and Seasonal Pattern of Pony Fishes (Leiognathus spp.) in Banten Bay
Abstrak: Ikan peperek merupakan salah satu jenis ikan yang dominan didaratkan di PPN Karangantu. Kegiatan penangkapan ikan peperek dalam intensitas tinggi dikhawatirkan akan menimbulkan masalah keberlanjutan sumberdaya ikan peperek di kemudian hari. Penelitian ini bertujuan untuk menghitung produktivitas penangkapan ikan peperek di PPN Karangantu, menghitung upaya penangkapan optimum lestari (Fopt) dan hasil tangkapan maksimum lestari (Copt) ikan peperek di Teluk Banten, dan menentukan pola musim penangkapan ikan peperek di Teluk Banten. Analisis data untuk perhitungan produktivitas penangkapan ikan peperek dapat dilihat dari produksi (catch) per upaya penangkapan (effort), perhitungan MSY dianalisis dengan menggunakan model surplus produksi Schaefer, Fox dan model regresi Walter-Hilborn. Pola musim penangkapan ikan peperek dapat dilihat dari Indeks Musim Penangkapan (IMP). Hasil penelitian menunjukkan nilai produktivitas penangkapan ikan peperek di PPN Karangantu dari tahun 2016 hingga 2020 mengalami penurunan. Nilai upaya penangkapan optimum dan hasil tangkapan optimum oleh model Schaefer sebesar 2.088 trip/tahun dengan 276,12 ton/tahun. Musim penangkapan ikan peperek tertinggi terjadi pada bulan November sebesar 145,526% dan terendah terjadi pada bulan Mei sebesar 70,286%., Pony fishes is one of the dominant types of fish landed in Karangantu Nusantara Fisheries Port. Fishing activites that carried out in high intensity will cause problems with the sustainability of fish resoursces in the future. The objectives of this research are to calculate the productivity of pony fishes in Karangantu Nusantara Fisheries Port, calculate the maximum sustainable fishing effort (Fopt) and the maximum sustainable fishing catch (Copt) of pony fishes in Banten Bay, and to analyze fishing season pattern for pony fishes in Banten Bay. Analysis of the data for calculating the productivity of pony fishes can be seen from the catch per unit effort, the MSY calculation is analyzed using the Schaefer, Fox, and Walter-Hilborn production surplus models. The season pattern of pony fihses can be seen from the Fishing Season Index (IMP). The results showed that the productivity of pony fishes at Karangantu Nusantara Fisheries Port from 2016 to 2020 has decreased. The optimum fishing effort and catch values by Schaefer model 2.088 trips/year with 276,12 tons/year. The highest fishing season for pony fishes occurred in November at 145.526% and the lowest occurred in May at 70.286%.
Keyword: MSY, musim penangkapan, Peperek, PPN Karangantu, produktivitas penangkapan

Judul: Evaluation of Peperek (Leiognathus spp.) Fishing Ground  Based on Catch in Pasir Jambak Beach Waters, Padang City
Abstrak: Nelayan di Kelurahan Pasir Jambak masih belum bisa mengoptimalkan hasil tangkapannya, padahal disana memiliki sumberdaya ikan yang melimpah. Hal ini disebabkan karena keterbatasan informasi dan pengetahuan nelayan terhadap dinamika daerah penangkapan ikan baik secara temporal maupun secara spasial. Penelitian ini bertujuan untuk menentukan produktivitas tangkapan secara temporal dan spasial, serta mengevaluasi daerah tangkapan ikan berbasis ukuran panjang dan produktivitas hasil tangkapan. Metode penelitian yang digunakan yaitu metode kualitatif dan kuantitatif dengan menggunakan analisis pendekatan terhadap nilai CPUE (Catch Per Unit Effort) dan analisis komposisi ukuran panjang ikan. Hasil penelitian menunjukkan bahwa produktivitas tertinggi untuk penangkapan ikan peperek terjadi pada musim timur terutama pada bulan Juni. Analisis hasil tangkapan menunjukkan bahwa daerah penangkapan peperek yang potensial terdapat di zona A, C, dan zona D. Selain produktivitas tangkapan yang relatif tinggi, komposisi ukuran ikan yang tertangkap di tiga zonasi A, C dan D juga didominasi oleh kategori layak tangkap., Fishers in the Pasir Jambak sub-district are still unable to optimize their catch, even though they have abundant fish resources. This is due to the limited information and knowledge of fishers on the dynamics of fishing grounds, both temporally and spatially. This study aims to determine the productivity of catches temporally and spatially and to evaluate the fish catchment area based on the length and productivity of the catch. The research method used is qualitative and quantitative methods by using an analytical approach to the value of CPUE (Catch Per Unit Effort) and analysis of the composition of the length of the fish. The results of this study indicate that the highest productivity for peperek fishing occurs in the eastern monsoon, especially in June. The results of the catch analysis show that the potential fishing grounds for peperek are in zone A, C, and zone D. In addition to the relatively high catch productivity, the composition of the size of the fish caught in the three zoning A, C and D is also dominated by the capture fit the category.
Keyword: fishing ground, fit to catch, Pasir Jambak, peperek, productivity

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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