Judul: The Impact of Catch Production Costs on Fishermen's Welfare and Fisheries Management in Pandeglang Waters
Abstrak: Sumberdaya perikanan di Desa Teluk Pandeglang Banten menjadi kunci produksi pangan dan pendapatan utama bagi masyarakat pesisir Indonesia. Meskipun mayoritas penduduk di daerah ini adalah nelayan, Tingkat kesejahteraan mereka cenderung rendah dibandingkan dengan masyarakat darat. Penelitian ini, dilakukan di PPP Labuan Pandeglang bulan Juni-November 2022, bertujuan menganalisis biaya produksi tangkapan berdsarkan musim dan dampaknya terhadap kesejahteraan nelayan. Hasil penelitian menunjukan bahwa biaya produksi yang terdiri dari biaya tetap, biaya tidak tetap, dan penyustan mempengaruhi pendapatan nelayan. Faktor lain yang mempengaruhi penapatan meliputi musim penangkapan, alat tangkap, harga ikan dan ketersedian. Analisis menunjukan bahwa Tingkat kesejahteraan nelayan diukur berdasarkan pendapatan dan pengeluaran bulanan berkolerasi positif dengan pendapatan mereka. Oleh karena itu, nelayan Pandeglang dapat dikategorikan memiliki tingkat kesejahteraan tinggi jika dibandingkan dengan Upah Minimum Regional (UMR) setempat., Fisheries resources in Teluk Pandeglang Village, Banten, are the key to food production and main income for Indonesian coastal communities. Even though the majority of residents in this area are fishermen, their level of welfare tends to be low compared to land-based communities. This research, conducted at PPP Labuan Pandeglang in June-November 2022, aims to analyze catch production costs based on season and its impact on fishermen's welfare. The research results show that production costs consisting of fixed costs, variable costs and depreciation affect fishermen's income. Other factors that influence fishing include fishing season, fishing gear, fish prices and availability. The analysis shows that the welfare level of fishermen measured based on monthly income and expenditure is positively correlated with their income. Therefore, Pandeglang fishermen can be categorized as having a high level of welfare when compared to the local Regional Minimum Wage (UMR).
Keyword: cost, fishermen, seasons, production, Pandeglang, well-being

Judul: The Impact of Seasonal Changes on the Fishermen’s Income of Jerbung Shrimp (Penaeus merguiensis) (Case study of Pelabuhan Perikanan Samudera Cilacap (PPSC) Fishermen Association, Cilacap Regency, Central Java)
Abstrak: Berdasarkan data tahunan Koperasi Unit Daerah (KUD) Mino Saroyo, hasil produksi udang jerbung di Tempat Pelelangan Ikan (TPI) PPSC merupakan yang terbesar di Kabupaten Cilacap. Usaha perikanan tangkap di laut merupakan aktivitas yang rentan terhadap perubahan musim, seperti kondisi perairan laut dengan gelombang tinggi ataupun angin kencang yang menjadi gangguan bagi nelayan dalam melakukan operasional penangkapan udang. Hal ini menyebabkan terjadinya perubahan hasil tangkapan yang berdampak pada perubahan pendapatan. Penelitian ini bertujuan untuk (1) mengidentifikasi persepsi nelayan terhadap perubahan musim, (2) mengestimasi perubahan pendapatan nelayan akibat perubahan musim, (3) menganalisis faktor-faktor yang memengaruhi pendapatan nelayan akibat perubahan musim, dan (4) mengkaji bentuk adaptasi yang dilakukan nelayan dalam menghadapi perubahan musim. Penelitian ini menggunakan metode penelitian studi kasus dan metode analisis yakni skala likert, analisis pendapatan, regresi linear berganda dan analisis deskriptif. Hasil penelitian menunjukkan bahwa pengetahuan dan persepsi nelayan terhadap perubahan musim dari 7 indikator memiliki skor 3,46. Nilai ini berada pada rentang 3,26-4,00 yang artinya nelayan sangat setuju bahwa perubahan musim memengaruhi pendapatannya. Nelayan mengalami penurunan pendapatan akibat perubahan musim sebesar Rp 684.424 per trip atau menurun sebesar 53,34 persen per trip pada saat musim panen. Faktor- faktor yang berpengaruh signifikan terhadap pendapatan adalah jumlah trip dan perubahan musim dengan taraf signifikansi 5 persen. Bentuk adaptasi yang paling banyak dilakukan nelayan dalam menghadapi perubahan musim yaitu penganekaragaman alat tangkap dengan persentase 45 persen. Adaptasi tersebut dipilih oleh nelayan untuk menyesuaikan dengan musim ikan di Perairan Cilacap dan saat alat tangkap trammel net tidak memungkinkan untuk dioperasikan di daerah penangkapan karena faktor musim., Based on the annual data of the Mino Saroyo Regional Unit Cooperative (KUD), the production of jerbung shrimp at the PPSC Fish Auction Site (TPI) is the largest in Cilacap Regency. The marine fisheries sector is a sector that is vulnerable to seasonal changes, such as sea conditions with high waves or strong winds which are a distraction for fishers in carrying out shrimp fishing operations. The purpose of this research is (1) identify fishers perceptions of seasonal changes, (2) estimate changes in fishers income due to seasonal changes, (3) analyze the factors that influenced the decrease in fishers income due to seasonal changes, and (4) examine adaptations made by fishers in dealing with seasonal changes. This study uses a case study research method and analytical methods are likert scale, income analysis, multiple linear regression, and descriptive analysis. The results showed that fishers knowledge and perceptions of seasonal changes form 7 indicators had a score of 3,46. This value is in the range of 3.26 – 4.00, which means that fishers strongly agree that seasonal changes affect their income. Fishers experience decrease in income due to seasonal changes of Rp. 684,424 per trip or a decrease of 53.34 percent per trip during the harvest season. The factors that have a significant impact on fishers income are the number of trips and seasonal changes with a significance level of 5 percent. The form of adaptation that fishers use mostly in dealing with seasonal changes is fishing gear diversification with a percentage of 45 percent. This adaptation was chosen by fishers
Keyword: Persepsi, alat tangkap, adaptasi, regresi linier berganda, udang jerbung

Judul: Penggunaan Teorema Homeomorphy 2-Manifold dan Teorema Euler Poincare pada Torus 𝑇�� dan Simplicial Complex 𝐾��
Abstrak: Two dimensional topological spaces are said to be homeomorphic if they have the same topological invariant, where one of topological invariant used is an Euler characteristic. Homeomorphy 2-Manifold’s Theorem and Euler Poincare’s Theorem are used to distinguish two topological spaces. Homeomorphy 2-Manifold’s Theorem uses Euler characteristic to identify two dimensional topological spaces. Euler Poincare’s Theorem is an alternative way to find Euler characteristic with Betti number, which is topological invariant as well. The objective of this paper is to investigate the homeomorphism of torus 𝑇����� and simplicial complex 𝐾�����. Topological space torus and simplicial complex 𝐾����� have the same Euler characteristic, which is two. Based on Homeomorphy 2-Manifold’s Theorem topological space torus 𝑇����� and simplicial complex 𝐾����� is homeomorphic.
Keyword: simplicial, torus, Euler, homeomorphism, topology