Judul: Kerentanan Stok Ikan yang Didaratkan di Pelabuhan Perikanan Nusantara (PPN) Karangantu, Banten
Abstrak: Indian mackerel, threadfin bream, yellowstripe scad, fringescale sardinella, and torpedo scad have an economically important value in Gulf of Banten. The fishing effort use are lift net, demersal danish seine, and gill net can be cause population depletion and vulnerability. The purpose of study was to assess the stock vulnerablility and potential of sustainability. Two main characteristic determine the sustainability of fishery is the population’s ability to recover once depleted (productivity) and the susceptibility of spesies capture (susceptibility). Indian mackerel had the highest value productivity and susceptibility than threadfin bream, yellowstripe scad, fringescale sardinella, and torpedo scad. The vulnerability index that have for Indian mackerel, threadfin bream, yellowstripe scad, fringescale sardinella, and torpedo scad consecutive which is 1.04, 1.00, 0.89, 0.73, and 0.93.
Keyword: vulnerability, susceptibility

Judul: Pelagic and Demersal Fishes Vulnerability Level in PPP Labuan, Banten
Abstrak: Sumber daya ikan di perairan Selat Sunda yang bersifat open access dan common property berpotensi menimbulkan risiko kerentanan pada ikan. Tingginya tingkat kerentanan ikan dapat memengaruhi keberlanjutan perikanan tangkap. Penelitian ini bertujuan untuk menentukan tingkat kerentanan sumber daya ikan pelagis dan demersal di perairan Selat Sunda yang didaratkan di Pelabuhan Perikanan Pantai (PPP) Labuan, Banten. Contoh ikan yang diteliti terdiri dari ikan pelagis yang terdiri dari ikan kembung, selar bentong, dan tongkol, serta ikan demersal yang terdiri dari ikan swanggi dan kurisi. Pengambilan contoh dilaksanakan pada bulan Juni hingga November 2022 di PPP Labuan dengan menggunakan metode pengambilan contoh acak sederhana (PCAS). Analisis indeks kerentanan stok ikan diduga dengan metode Productivity and Suceptibility Analysis (PSA) menggunakan parameter produktivitas dan suseptibilitas. Kedua parameter tersebut memiliki seperangkat atribut yang berkaitan dengan tingkat kerentanan sumber daya ikan. Hasil penelitian menunjukkan bahwa nilai indeks kerentanan ikan kembung, tongkol, selar bentong, swanggi, dan kurisi secara berturut-turut yaitu sebesar 1,24, 1,41, 1,04, 1,62, dan 1,48. Kelima jenis ikan contoh memiliki nilai indeks kerentanan yang termasuk ke dalam kategori kerentanan rendah karena masih berada di bawah 1,8. Ikan selar bentong dianggap paling mampu bertahan di alam karena memiliki produktivitas yang paling tinggi. Ikan swanggi dianggap paling rentan terhadap kegiatan penangkapan karena selain memiliki indeks kerentanan tertinggi juga memiliki suseptibilitas yang paling tinggi., Fish resources in Sunda Strait which are open access and common property have the potential to pose a vulnerability risk to fish. High vulnerability level of fish can affect the sustainability of capture fisheries. This study aims to determine the level of vulnerability of pelagic and demersal fish resources in the waters of the Sunda Strait which are landed at the Coastal Fishing Port (PPP) Labuan, Banten. The samples consisted of pelagic fish consisting of Rastrelliger faughni, Auxis rochei, and Selar crumenophthalmus, also demersal fish consisting of Priacanthus tayenus and Nemipterus japonicus. Sampling was conducted from June to November 2022 at PPP Labuan using the simple random sampling method. Analysis of the vulnerability index was estimated using the Productivity and Susceptibility Analysis (PSA) method with productivity and susceptibility parameters. Both of these parameters have a set of attributes related to the vulnerability level of fish resources. The results showed that the vulnerability index values for Rastrelliger faughni, Auxis rochei, Selar crumenophthalmus, Priacanthus tayenus, and Nemipterus japonicus were respectively 1,24, 1,41, 1,04, 1,62, and 1,48. The five sample fish species are included in the low vulnerability category because the the vulnerability level of each species is still below 1,8. Selar crumenophthalmus is considered the most capable of surviving in nature because it has the highest productivity. Priacanthus tayenus is considered the most vulnerable to fishing activities because beside having the highest vulnerability index, it also has the highest susceptibility.
Keyword: PPP Labuan, productivity, susceptibility, vulnerability

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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