Judul: Aplikasi Pakan Buatan dan Dampaknya Terhadap Kondisi Biometrik dan Biologis Benih Ikan Sidat (Anguilla sp.)
Abstrak: Upaya yang dapat dilakukan untuk meminimalisir eksploitasi berlebih pada benih ikan sidat (glass eel) yaitu melalui efisiensi penggunaan benih glass eel pada kegiatan budidaya. Efisiensi penggunaan benih (glass eel) dapat diwujudkan melalui pemenuhan nutrien glass eel pada tahap pendederan agar dihasilkan Survival Rate (SR), Specific Growth Rate (SGR) serta efisiensi pakan yang tinggi. Penelitian ini bertujuan untuk mengevaluasi pengaruh pakan buatan terhadap keragaan biometrik dan biologis glass eel. Pelaksanaan penelitian dilakukan dari bulan Februari hingga April 2023. Glass eel sebanyak 1200 ekor dibagi ke dalam 4 perlakuan berdasarkan jenis pakan (cacing sutera, IPB, Feng Li, dan STP). Hasil penelitian menunjukkan bahwa nilai faktor kondisi berkisar 0,09-0,15, panjang usus relatif (PUr) berkisar 20,35-23,01%, bobot usus relatif (BUr) berkisar 20,27-32,11%, bobot jantung relatif (BJR) berkisar 4,82-6,96%, dan bobot hati relatif (BHr) berkisar 24,51-30,36%. Pakan alami memberikan hasil yang lebih baik dibanding pakan buatan dan pakan buatan khusus glass eel IPB lebih baik dibanding pakan buatan lain yang diuji cobakan., Efforts can be made to minimize the overexploitation of glass eels through the efficient use of glass eel seeds in aquaculture activities. The efficient use of glass eel seeds can be realized by fulfilling glass eel nutrients at the seedling stage to produce a high Survival Rate (SR), Specific Growth Rate (SGR), and feed efficiency. This study aims to evaluate the effect of artificial feed on the biometric and biological performance of glass eel fry. The research was conducted from February to April 2023. The 1200 glass eels were divided into four treatments based on the type of feed (silkworm, IPB, Feng Li, and STP). The results showed that condition factor values ranged from 0.09-0.15, relative intestinal length (PUr) ranged from 20.35-23.01%, relative intestinal weight (BUr) ranged from 20.27-32.11%, relative heart weight (BJR) ranged from 4.82-6.96%, and relative liver weight (BHr) ranged from 24.51-30.36%. The natural feed gave better results than the artificial feed, and the IPB glass eel artificial feed was better than the tested artificial feed.
Keyword: eel, glass eel, growth, silkworm

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