Judul: Resilience and Growth Some Tilapia Strains in Acid Media. Supervised
Abstrak: Budidaya perikanan di daratan harus terus ditingkatkan akibat dari penggunaan wilayah daratan untuk berbagai aspek kehidupan. Lahan gambut tersebar di beberapa pulau di Indonesia. Namun masih sangat minim pemanfaatannya dalam bidang perikanan, karena memiliki tingkat keasaman yang tinggi dengan warna air kehitaman dan dengan kandungan oksigen yang rendah. Gambut tropika biasanya bersifat masam dengan kisaran pH sebesar 4 sampai 5. Penelitian ini bertujuan untuk mengkaji pemanfaatan air ber-pH asam sebagai media budidaya untuk pembesaran beberapa strain ikan nila, serta menentukan strain ikan nila yang memiliki ketahanan terhadap pH asam ditinjau dari kelangsungan hidup, pertumbuhan panjang dan bobot, efisiensi pakan, dan histologi insang ikan nila berbagai strain yang dipelihara di media ber-pH asam. Hasil penelitian menunjukkan ikan nila strain BEST dan GIFT tidak dapat bertahan hidup, yaitu tingkat kelangsungan hidup sebesar 0%. Sedangkan yang dapat bertahan hidup pada media asam adalah ikan nila Merah, dengan tingkat kelangsungan hidup sebesar 30%, laju pertumbuhan bobot 1,34±1,20%, laju pertumbuhan panjang 0,66±0,40%, dan efisiensi pakan 45,26±22,56% selama 30 hari pemeliharaan. Perlakuan pH asam pada media dapat menyebabkan kerusakan lamella insang, yaitu kerusakan berupa hiperplasia, hipertropi, fusi, nekrosis, hemorrage, dan lapisan epitel terangkat dengan tingkat kerusakan berbeda
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Judul: Kinerja Pertumbuhan Ikan Nila Oreochromis niloticus Strain BEST pada Media Pemeliharaan dengan Derajat Kemasaman Berbeda
Abstrak: In Indonesia, peat land has pH degree that is relatively high, ranged from 3-5. Tilapia which is one of the superior commodities, is expected to be introduced in peat land as well as conducted with catfish. In order that, the production of tilapia is able to be improved optimally in more aquaculture lands of Indonesia. The objective of this study is analyze the work of growth in BEST tilapia strain, include Survival Rate, Specific Growth Rate, the growth of absolute length, amount of feed consumtion, feed efficiency, rearing media with acidity degree 3, 4, 5, and 6. Tilapia strain BEST that are used in the study size from 4,52±3,9 cm long and 1,35±0,3 g weight. The tilapias were placed in 12 aquariums with 60x50x40 cm in size and density as many as 40 fish each. The feed is the made-up feed (pellet) and given 3 times a day at satiation. Based on the result of this research, at 3 and 4 acidity degree the BEST strain tilapia couldn’t survive, showed by 0 % of survival rate. At 5 acidity degree, the survival rate was 50,8% whereas at 6 acidity degree was 75%. Growth rate either length growth and Specific Growth Rate at 5 acidity degree was slower than 6 acidity degree. Besides the acidity degree treatment on media could caused damaged in gill microanatomy include the damage such as hypertrophy, hyperplasia, fuse and telangiektasis with diffrent level of damage.
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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