Judul: Kajian bioekologi dalam rangka menentukan arah pengelolaan ikan belida (Chitala lopis Bleeker 1851) di Sungai Kampar, Provinsi Riau
Abstrak: Research on bioecology to determine the course of giant featherback management (Chitala lopis bleeker 1851) in Kampar River, Riau Province was conducted from May 2009 until November 2010. Research objectives were examined bioecology aspects of giant featherback (structure and health status of giant featherback populations reviewed from population biology, diets, growth, reproduction and habitat) and formulated concepts and strategies for giant featherback management. The study was conducted using survey and purposive sampling method. Giant featherback specimens were collected from five stations sampling in Kampar River, as a comparison, samples from Barito River (South Kalimantan Province), Penyak River (Bangka-Belitung Province), Mahakam River (East Kalimantan Province) and Indragiri Hilir (Riau Province) were also collected for population genetic analysis. The results reveal that giant featherback in Kampar River Riau Province identified as Chitala Lopis and fragmented in two population units. Morphological characteristics of giant featherback showed phenotypic plasticity and they can not be used to identify unit of population. Kampar River giant featherback classified as carnivorous fish with isometric growth type both male and female. These fishes were matured yearlong in all five sampling stations whereas rainy season as the peak of spawning season. The average size of male giant featherback first maturity is 646.6 mm and 683.5 mm for female. Female giant featherback has a relatively small fecundity which is ranged from 442-11972 eggs. Kuala Tolam Station represents the highest value of environment index for giant featherback specises meanwhile Teso and Rantau Baru as the lowest ones. The strategies of Kampar River giant featherback management are restocking policies in Kuala Tolam, Langgam and Kutopanjang. Translocations population should be conducted on Teso and Rantau Baru populations with Kutopanjang and Langgam as the source populations.The captured sizes of male giant featherback should be more than 646.6 mm, these imply on modification giant featherback fishing gear such as distance between timber in lukah fishing gear minimum 3.8 cm, the size of net and scoop nets on the appliance sempirai at least 10 cm and the minimum size of fish bait is 3 cm. The giant featherback fishing activities could be conducted throughout the year except in November. In fishing control, Teso, Langgam, Rantau Baru and Kuala Tolam Station should be treated as the targets for restraint in fishing activities meanwhile Kutopanjang Station is suitable for intensively giant featherback fishing. Recommendations habitat restoration policies were aimed at Teso and Rantau Baru Station related to restriction on gold mine activities in upper stream of Teso, reshape river, restriction on floating aquaculture in Rantau Baru and reforestation of riparian vegetation in Teso and Rantau Baru Station.
Keyword: pengelolaan ikan, Ikan Belida, Chitala Lopis, Sungai Kampar, Riau, Keragaman Genetik, Fluktuasi Asimetrik, Kualitas Perairan

Judul: Studi Habitat dan Pertumbuhan Ikan Belida (Chitala lopis) di Daerah Perairan Sungai Kampar, Provinsi Riau
Abstrak: Ikan belida (Chitala lopis) merupakan ikan air tawar asli Indonesia yang dilindungi berdasarkan SK Mentan No. 716/kpts/Um/10/80, memiliki nilai ekologi dan ekonomis yang cukup tinggi sebagai ikan hias dan konsumsi. Data statistik Dinas Kelautan dan Perikanan Provinsi Riau (2005) melaporkan keberadaan populasi ikan belida di Daerah Aliran Sungai Kampar sudah sangat berkurang, diduga tidak hanya disebabkan dari aktivitas penangkapan yang lebih (Over Fishing) tetapi juga adanya tekanan ekologis pada habitat ikan belida tersebut. Penelitian ini bertujuan mengkaji aspek habitat dan biologi pertumbuhan untuk mendapatkan informasi berguna bagi penentuan habitat yang cocok dalam upaya konservasi dan pengelolaan secara optimal agar sumberdaya ikan belida tetap lestari. Penelitian dilakukan di pada bulan Mei sampai November 2009, di lima lokasi antara lain; Waduk Kuto Panjang, Sungai Teso, Langgam, Rantau Baru, dan Kuala Tolam. Objek yang dikaji berupa panjang-bobot ikan, parameter fisika-kimia perairan, dan mengamati komposisi vegetasi serta kerusakan pinggiran sungai di lokasi penangkapan ikan belida. Dari pengklasteran habitat perairan Sungai Kampar ditentukan menjadi dua kelompok habitat saja yang memiliki perbedaan karakteristik dasar yaitu; kelompok habitat perairan mengalir (Sungai Teso, DAS Langgam, Rantau Baru, dan Kuala Tolam) dan habitat perairan tergenang (Waduk Kuto Panjang). Adapun terjadinya hierarki pengelompokkan pada habitat perairan mengalir disebabkan adanya perbedaan kondisi lingkungan perairan antara bagian hulu dan hilir sungai yaitu pada parameter: kecerahan, pH, kesadahan, alkalinitas, dan ancaman kerusakan vegetasi pinggiran sungai.
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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