Judul: Eel Fish Response (Anguilla sp.) Glass Eel Stadia against Different Light Colors
Abstrak: Respons ikan sidat (Anguilla sp.) stadia glass eel terhadap cahaya yang berbeda merupakan pengetahuan dasar untuk mengembangkan metode penangkapan ikan dan konservasi sumberdaya ikan. Tujuan penelitian ini adalah mendeskripsikan respons ikan sidat stadia glass eel terhadap cahaya yang berbeda. Pengamatan respons glass eel terhadap cahaya LED merah, biru, dan putih dibandingkan dengan tanpa cahaya sebagai kontrol dilakukan di laboratorium. Glass eel yang digunakan berukuran 4.0-6.1 cm sebanyak ±700 ekor yang ditangkap dari muara Sungai Cimandiri Pelabuhanratu. Pengamatan dilakukan selama 31 hari dimulai dari 5 hari setelah penangkapan glass eel. Respons glass eel terhadap cahaya dianalisis secara deskriptif dengan uji Mann Whitney dan Kruskal-Wallis. Pengamatan menunjukkan bahwa glass eel lebih banyak merespons pada zona gelap dengan nilai diatas 80% bila dibandingkan dengan zona yang diberi cahaya lampu LED merah, biru, dan putih. Persentase jumlah ikan pada lampu LED merah sebesar 23±0.22% lebih tinggi dengan jumlah ikan pada lampu LED biru sebesar 10±0.21% dan lampu LED putih 8±0.15% (p<0.05, Kruskal-Wallis). Perbedaan respons terhadap cahaya dapat digunakan untuk aplikasi penangkapan glass eel khususnya penggunaan lampu untuk alat bantu dan konservasi ikan sidat untuk membuat zona penangkapan dan jalur ruaya sidat., The response of eel fish (Anguilla sp.) glass eel stadia to different light is a basic knowledge to develop methods of fishing and conservation of fish resources. The purpose of this study is to describe the response of eel stadia glass eel fish to different light. Observations of glass eel response to red, blue, and white LED light compared to without light as controls were carried out in the laboratory. Glass eel used measuring 4.0-6.1 cm as much as ±700 heads were caught from the estuary of Cimandiri River of Pelabuhanratu. Observations were made for 31 days starting from 5 days after the capture of the glass eel. The glass eel's response to light was descriptively analyzed with the Mann-Whitney and Kruskal-Wallis tests. Observations showed that glass eels responded more to dark zones with values above 80% when compared to zones given red, blue, and white LED light. The percentage of fish in red LED lights was 23±0.22% higher with the number of fish on blue LED lights by 10±0.21% and white LED lights 8±0.15% (p<0.05, Kruskal-Wallis). The difference in response to light can be used for glass eel catching applications, especially the use of lamps for eel fish aids and eel conservation to create fishing zones and eels.
Keyword: Anguilla sp., eel behavior, glass eel, LED light, response to light

Judul: Ketajaman Penglihatan Sidat (Anguilla sp.) dan Penerapannya pada Proses Penangkapan
Abstrak: Sidat (Anguilla sp.) termasuk ikan nokturnal yang aktif mencari makan pada malam hari. Respon penglihatan, khususnya ketajaman penglihatan sidat menjadi penting dalam pengembangan metode dan teknologi penangkapan ikan. Penelitian ini bertujuan untuk mengukur ketajaman penglihatan, dan menentukan sumbu penglihatan ikan sidat, serta menghitung jarak pandang maksimum sidat terhadap umpan. Kemampuan penglihatan sidat dianalisis secara fisiologi melalui serangkaian proses histologi. Berdasarkan hasil analisis histologi yang dilakukan terhadap sidat sampel, diperoleh bahwa susunan sel reseptor seperti pada umumnya ikan membentuk mozaik, yang tersusun oleh sel kon tunggal (single cone cell) dan sel kon ganda (twin cone cell). Kepadatan sel kon tertinggi terletak pada bagian ventro-temporal retina sidat. Hal ini menunjukkan bahwa penglihatan sidat ke arah depan-naik (upper-fore). Indeks ketajaman penglihatan sidat berkisar 0,04-0,09 untuk panjang total ikan 350-630 mm. Jarak pandang maksimum sidat dalam melihat objek berukuran 10 mm berkisar 1,38-3,05 m untuk panjang tubuh ikan 350-630 mm., Eels (Anguilla sp.) are nocturnal species that actively forages at night. The visual response, especially visual acuity of eels is crucial for the development of fishing methods and technology. This study aims to measure visual acuity, determine the visual axis, and calculate the maximum sighting distance of eels toward the bait. The visual acuity of eels was physiologically analyzed through a series of histological processes. Based on the results of the histological analysis of the eel eye samples, it was found that the structure of the receptor cells in the eel’s eye retina formed a mosaic, consisting of single and twin cone cells. The highest density of cone cells in eels was located in the ventro-temporal part of the retina, indicating that the eel’s vision is oriented toward the upper-front direction. The visual acuity of eels ranged from 0,04 to 0,09 for a fish with a total length of 350-630 mm. The maximum sighting distance of eels to detect a 10 mm diameter object ranged from 1,38 to 3,05 m for a body length of 350-630 mm.
Keyword: jarak pandang maksimum, kepadatan sel kon, ketajaman penglihatan, sidat, sumbu penglihatan

Judul: Penyusunan Overlap Graph menggunakan Suffix Tree pada DNA Sequence
Abstrak: The DNA sequence assembly is very important in genome analysis. This step aims to reconstruct contigous DNA fragment (contigs) from short fragment by concatenating fragments based on the overlap region among them. This method employs overlap graph for solving the problems. In this graph, nodes represent fragments and edges represent overlap. This research developed a software for constructing overlap graph using suffix tree. The evaluation was conducted by measuring the number of nodes, number of edges, and the execution time in many values of minimum overlap. The minimum overlap is defined as the minimum length of substring which is considered as the overlap region between two fragments. The evaluation results showed that the number of nodes, the number of edges, and the execution time were increased with the decreasing of the minimum overlap value.
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