Judul: Bycatch of Gillnet Vessels Based at Karangsong Indramayu Fish Landing Base
Abstrak: Pangkalan Pendaratan Ikan (PPI) Karangsong menjadi pemasok terbesar perikanan laut di Jawa Barat. Tingginya jumlah hasil tangkapan yang didaratkan, sementara tidak adanya penelitian atau informasi mengenai komposisi hasil tangkapan yang layak tangkap, berpotensi merubah kondisi sumberdaya ikan. Penelitian ini bertujuan menghitung komposisi jenis ikan hasil tangkapan sampingan selama 5 tahun, porsi hasil tangkapan sampingan, dan porsi hasil tangkapan sampingan yang layak tangkap yang berpangkalan di PPI Karangsong. Analisis deskriptif digunakan dalam mengolah dan menganalisis data yang didapatkan dengan perangkat lunak Microsoft. Analisis data komposisi hasil tangkapan selama 5 tahun menunjukkan bahwa hasil tangkapan ikan pelagis setiap tahun mengalami penurunan, sedangkan ikan demersal mengalami peningkatan. Hasil penelitian menunjukkan bahwa terdapat 4 jenis ikan hasil tangkapan utama dan 10 jenis ikan hasil tangkapan sampingan. Berdasarkan porsi jenis ikan target adalah 17,46% sedangkan porsi jenis ikan hasil tangkapan sampingan adalah 82,54%. Jika kriteria perikanan ramah lingkungan adalah porsi hasil tangkapan utama ≥ 60% maka perikanan yang dilakukan oleh kapal jaring insang ini tergolong tidak ramah lingkungan. Ukuran layak tangkap hasil tangkapan utama dan sampingan adalah 71,4%. Jika kriteria perikanan ramah lingkungan adalah porsi ikan dewasa > 60% maka perikanan jaring insang ini dapat disebut ramah lingkungan., The Karangsong Fish Landing Base is the largest supplier of marine fisheries in West Java. The high number of catches landed, while there is no research or information regarding the composition of catches that are worth catching, has the potential to change the condition of fish resources. This study intends to determine the species composition of by-catch fish during a 5-year period, portion of bycatch, and also a portion of bycatch sizes specifically targeted in a fishery from PPI Karangsong. Descriptive statistical analysis is used in processing and analyzing the data obtained with Microsoft software. Analysis of catch composition data for 5 years shows that the catch of pelagic fish has decreased every year, while demersal fish has increased. The catch is at least 4 types of main catch and 10 types of bycatch. Based on the portion of the main catch species is 17.46% while the portion of bycatch types of fish is 82.54%. If the criteria for environmentally friendly fisheries are the portion of the main catch ≥ 60%, then the fishery carried out by gillnet ships is classified as not environmentally friendly. The catch size of the main catch and bycatch is 71.4%. If the criteria for environmentally friendly fisheries are the portion of adult fish > 60%, then this gillnet fishery can be called environmentally friendly.
Keyword: Bycatch, environmentally friendly, main catch

Judul: Optimasi Teknis Perikanan Gillnet Millenium di Desa Karangsong, Kabupaten Indramayu
Abstrak: Northern Java Sea has already know as one of the most productive sea in Indonesia. Development of PPI Karangsong, is one of Fisheries development policies of Indramayu Regency for increasing the regional economic growth. Gillnet millennium is one of the most popular fishing gear in PPI Karangsong. Fishermen in Karangsong use gillnet millennium in some variation type of technical and operation method. This study aims to determine which gillnet millennium variation type has the best optimization score. This study was held by using survey method, and the data collected by purposive sampling method. Based on the results of the study revealed that the ship that operate in the PPI Karangsong made of wood with the size of the 5 GT, 20 GT, 30 GT, 40 GT and 60 GT. .Gillnet millenium that are used by fishermen made of polyamide monofilament material, the size of the gillnet millenium that is operated on the basis of the size of the ship is all 20 pieces up to 110 pieces. The fishermen in karangsong most of the fishermen are full. The score of the function for four groups as studies object are 0,18 (< 10 GT), 2,812 (20 GT), 1,824 (30 GT), and 2,89 (> 40 GT). Production factors that influence the optimization of gillnet millennium are depth of the net, number of day of the trip, and the fishing location.
Keyword: 

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