Judul: Kajian Daya Dukung Lingkungan Perairan Bagi Pengembangan Perikanan Berbasis Ranching dan Budidaya Ikan KJA di Waduk Malahayu.
Abstrak: The study was conducted to determine the Carrying capacity of Malahayu water reservoirs in sub-district of Banjarharjo, district of Brebes, Central Java Province. By knowing the capacity of the water, the water can be used for fisheries development activities for the purpose of welfare of fishing community. The capacity of water, was done by the observation of water quality which consists of parameters of physics, chemistry and biology aquatic performed both in Situ/Lake and laboratory analysis. Data of Physical conditions of Malahayu water reservoir was obtained through interviews with the authorities of Malahayu Mater reservoir. While to know the welfare of fishing communities (Nila Jaya) was obtained by spreading quisioner. The study took place in the dry season in August to November, 2011. The method used to determine the Carrying capacity of the fisheries and fish farming of Ranching, fish cultivation of KJA used Beveridge methods,1996. The observation results which were obtained were: temperature 27-28oC, the brightness of 83 - 146 cm, flow rate 1.5 / 5 dt-1, 5/7 dt. The Analaisis of nutrient indicated status of oligotrofik waters to mesotrofik of <0.1 mg/l. Biological parameters: chlorophyll-a with the observations is 14 - 21.4 mg / l, primary productivity from 6 - 13.6 mg / l, phytoplankton found were cholorophyceae class, bacillarophyceae, euglenophyceae, cyanophyceae and dinophyceae, the highest number of genara was in cholorophyceae and the lowest was in the dinophyceae class. Carrying capacity of the fisheries development of Ranching is 207.522 tons/year, the number of seeds dispersed was 2.07522 fry / year. Support capability of KJA fish farming is 2.128 tons / year, the KJA unit number is 2.128 units, with the Malahayu water reservoir area which was required 417.088 m2. The results of water quality analysis and water capacity of Malahayu reservoir showed that, Malahayu reservoir can be developed together for the development of fisheries and Ranching fish farming. This design, can increase the welfare of fishing communities (Nila Jaya) in Malahayu Reservoir.
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Judul: Status Keberlanjutan Perikanan Budidaya Keramba Jaring Apung (KJA) di Waduk Jatiluhur, Kabupaten Purwakarta
Abstrak: Kegiatan perikanan budidaya ikan air tawar di keramba jaring apung (KJA) merupakan salah satu budidaya ikan secara intensif. Kegiatan perikanan ini memberikan dampak positif terhadap masyarakat sekitar dengan meningkatnya perekonomian dan membuka lapangan kerja. Hal lain dari adanya dampak positif terdapat dampak negatif yaitu meningkatnya kandungan bahan organik dari hasil penumpukan sisa pakan, hasil feses organisme dan limbah dari masyarakat yang tinggal di rumah apung di sekitar KJA mengakibatkan menurunnya kualitas air, sehingga perlu adanya kajian tentang keberlanjutan perikanan budidaya KJA dan menemukan atribut kunci untuk pengelolaan yang lebih lanjut. Penentuan status keberlanjutan perikanan budidaya KJA menggunakan aplikasi Rapfish (Rapid Appraisal for Fisheries) melalui pendekatan sistem MDS (Multi Dimensional Scaling) dengan memperhatikan lima dimensi keberlanjutan (ekologi, ekonomi, sosial, kelembagaan dan teknologi), sehingga dapat mengetahui apakah suatu kegiatan perikanan budidaya KJA dapat berkelanjutan atau tidak dan melihat dimensi apa yang paling berpengaruh terhadap keberlanjutan suatu kegiatan. Penelitian ini berlokasi di Waduk Jatiluhur, Kecamatan Jatiluhur, Kabupaten Purwakarta. Tujuan dari penelitian ini yaitu 1) Menentukan status keberlanjutan perikanan budidaya keramba jaring apung (KJA) di Waduk Jatiluhur; 2) Menentukan atribut kunci yang berperan sebagai faktor pengungkit keberlanjutan perikanan budidaya KJA di Waduk Jatiluhur. Hasil status keberlanjutan perikanan budidaya KJA yang didapatkan dari hasil penelitian yaitu dengan nilai indeks 51.33 yang menunjukkan kategori cukup berkelanjutan. Atribut kunci yang dapat digunakan untuk meningkatkan status keberlanjutan perikanan budidaya KJA yaitu kesuburan perairan, kemudahan pasar, upah tenaga kerja, konflik ruang, kepemilikan usaha, penegakan hukum, pemilihan ukuran dan penjarangan serta teknologi pembenihan.
Keyword: keramba jaring apung, multi dimensional scaling, perikanan budidaya, rapfish

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