Judul: Elver Survival Test Comparing Between Wet and Dry Media
Abstrak: Ikan sidat sirip pendek Indonesia (Anguilla bicolor bicolor) merupakan salah satu komoditas perikanan yang memiliki nilai ekonomi penting. Keberhasilan pengangkutan benih ikan diukur dari rendahnya angka kematian benih yang diangkut, kemudian mampu beradaptasi dan dapat tumbuh saat dipelihara pasca pengangkutan. Penelitian ini bertujuan menganalisis kemampuan bertahan hidup benih ikan sidat (elver) dengan perbedaan media basah dan kering. Penelitian dilaksanakan pada bulan Oktober hingga Desember 2021 di Laboratorium Fisiologi Hewan Air. Parameter yag diamati yaitu sintasan, tingkat konsumsi oksigen di dalam dan di luar air, glukosa darah dan fisika-kimia air (suhu, pH, oksigen terlarut). Peningkatan persentase glukosa darah pada media basah, media kering dasar lembab serta media kering dasar lembab dan bahan pengisi dari media air berturut-turut adalah 9,04%, 30,72%, dan 48,80%. pH dan DO selama percobaan cocok untuk kelangsungan hidup sidat. Elver mampu hidup selama 24 jam pada media basah (sintasan 97,5%) dengan kondisi fisiologisnya yang relatif baik. Pada media kering dasar lembab, elver kurang mampu bertahan hidup (sintasan 77,5%) dengan kondisi fisiologis yang menurun. Pada media kering, elver mampu bernapas dengan kulit, dengan tingkat konsumsi oksigen sebesar 23,21% dari kebutuhan normalnya pada media air., The Indonesian shortfin eel (Anguilla bicolor bicolor) is a fishery commodity with important economic value. The success of fish seed transportation is measured by the low mortality rate of the transported fry and then adapts and can grow when cared for post transport. This study aimed to analyze the survivability of elver seeds with differences in wet and dry media. The research was carried out from October to December 2021 at the Aquatic Animal Physiology Laboratory. Parameters observed were survival rate, oxygen consumption rate inside and outside water, blood glucose, and water physical-chemistry (temperature, pH, Dissolved Oxygen). The increase in blood glucose percentages in wet media, dry moist media and dry moist media with fillers from water media were 9,04%, 30,72%, and 48,80% respectively. pH and DO during the experiment are suitable for the survival of eels Elver was able to live for 24 hours in wet media (97,5% survival rate) with relatively good physiological conditions. In dry moist media, were less able to survive (77,5% survival rate) with decreased physiological conditions. In dry media, the elver is able to breathe with the skin, with an oxygen consumption rate of 23,21% of its normal needs in water media.
Keyword: Anguilla bicolor bicolor, respiration, transportation

Judul: Study of Digestive Enzyme Activity of Eel (Anguilla  bicolor bicolor) Seeds as a Basis for Feed Management to Increase Survival and  Feed Efficiency
Abstrak: Permasalahan pada kegiatan budidaya sidat yaitu lambatnya pertumbuhan ikan stadia glass eel menjadi elver yang dapat menurunkan produksi secara keseluruhan mencapai 30-40% dari total populasi yang dipelihara. Penelitian ini bertujuan untuk mengkaji penyebab rendahnya pada kelompok benih ikan sidat (elver) berukuran kecil hasil grading pada pendederan dari glass eel menjadi elver. Pengambilan elver dilakukan dengan metode penarikan contoh acak sederhana sebanyak total 300 ekor. Contoh ikan kemudian diukur bagian tubuhnya untuk menghasilkan data biometrik dan diambil bagian organ pencernaan (lambung dan usus) untuk keperluan analisis aktivitas enzim. Hasil penelitian menunjukan bahwa aktivitas enzim protease di lambung dan di usus, aktivitas lipase dan amilase usus serta ukuran relatif diameter mata, lebar bukaan mulut, bobot insang dan hati pada elver berukuran kecil lebih kecil dibandingkan dengan kelompok elver berukuran sedang dan besar., The problem with eel cultivation activities is the slow growth of glass eel stage fish into elvers which can reduce overall production by 30-40% of the total population being reared. This research aims to examine the causes of the low number of small-sized eel fish fry resulting from grading in nurseries from glass eel to elver. Elvers were taken using a simple random sampling method with a total of 300 individuals. The fish samples were then measured for body parts to produce biometric data and parts of the digestive organs (stomach and intestines) were taken for enzyme activity analysis. The results of the study showed that the activity of protease enzymes in the stomach and intestines, the activity of intestinal lipase and amylase as well as the relative size of eye diameter, mouth opening width, gill and liver weight in small elvers were smaller than those in the medium and large elver groups.
Keyword: Anguilla bicolor bicolor, enzym, elver, growth

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