Judul: Food and Feeding Habit of Opudi, Telmatherina Sarasinorum Kottelat 1991, in Matano Lake, South Sulawesi
Abstrak: Telmatherina sarasinroum atau ikan opudi adalah spesies ikan endemik yang memiliki habitat asli di Danau Matano. Makanan dan kebiasaan makan merupakan aspek biologis penting sebagai upaya konservasi ikan ini. Penelitian ini bertujuan mengkaji makanan dan kebiasaan makan ikan opudi. Pengumpulan sampel dilakukan di Danau Matano selama Maret 2018 hingga Februari 2019. Analisis data yang digunakan antara lain indeks bagian terbesar, luas relung, tumpang tindih, dan dimensi organ yang berhubungan dengan kebiasaan makan ikan. Hasil penelitian menunjukkan ikan opudi memiliki makanan utama berupa larva serangga (IBT=48,26–78,74) dengan komposisi larva serangga tertinggi pada bulan Oktober 2018 dan pada Stasiun 2. Makanan lain yang ditemukan dengan komposisi yang besar yaitu telur dan nematoda. Diameter mata relatif sebesar 62,30% dan lebar bukaan mulut relatif sebesar 59,55%. Nilai luas relung 0,1030 dan tumpang tindih antar jenis kelamin 0,7479. Ikan opudi termasuk ikan karnivor dengan makanan utama berupa larva serangga dan makanan tambahan berupa telur dan nematoda. Ikan termasuk selektif (spesialis) dalam memanfaatkan makanan dan terjadi kompetisi antara ikan jantan dan betina. Ikan aktif mencari makan pada siang hari (diurnal) dengan cara mengonsumsi mangsa yang berada di dasar perairan., Telmatherina sarasinorum or opudi is an endemic fish species that live in Matano Lake. Food and feeding habits are important biological aspects as conservation efforts for this species. The aim of the study was to investigate stomach contents and feeding habits of T. sarasinorum. Fish sampling was performed between March 2018 to February 2019. Data analysis used in this research were the index of preponderance, niche breadth, feeding overlap, and organs dimension associated with feeding activity. The result showed that opudi is carnivorous with main diet consisting of insect larva (IP=48.26–78.74), with biggest insect larva composition found on October 2018 and at Station 2. Supplementary food was egg and nematode. Relative eye diameter was 62.30% and relative width mouth opening is 59.55%. Opudi are insect larva-feeder and complementary food contain egg and nematode. This species had specialization in utilizing food and have high competition among male and female. The fish have day-light feeding time which predation on their prey in bottom of waters.
Keyword: Feeding habit, food, Matano Lake, Telmatherina sarasinorum

Judul: Makanan dan Kebiasaan Makan Ikan Endemik Telmatherina antoniae (Kottelat, 1991) di Danau Matano, Sulawesi Selatan
Abstrak: Telmatherina antoniae merupakan salah satu ikan endemik yang hidup di perairan Danau Matano. Ikan ini biasa disebut opudi oleh masyarakat sekitar. Makanan dan kebiasaan makan ikan opudi merupakan informasi biologi yang penting untuk upaya perlindungan ikan Telmatherina antoniae di alam. Penelitian ini bertujuan untuk mengetahui makanan dan kebiasaan makan ikan Telmatherina antoniae di Danau Matano, Sulawesi Selatan. Sampling dilakukan setiap bulan dari Maret 2018 sampai dengan Februari 2019 di bagian litoral perairan Danau Matano. Analisis data yang digunakan yaitu indeks bagian terbesar, luas relung, tumpang tindih, dan data biometrik yang berhubungan dengan kebiasaan makan ikan. Hasil menunjukkan bahwa ikan opudi merupakan ikan karnivora dengan makanan utama berupa larva serangga dengan IBT sebesar 25,76 – 89,70 . Ikan opudi termasuk ke dalam golongan ikan diurnal dan mencari makan di badan perairan yang ditunjukkan oleh data biometrik berupa bentuk mulut terminal, diameter mata relatif sebesar 44 %, lebar bukaan mulut relatif sebesar 38 %, dan panjang usus relatif sebesar 22 % pada jantan dan 20% pada betina. Ikan opudi jantan memiliki luas relung yang lebih sempit dibandingkan ikan betina, yaitu sebesar 0,16 serta ikan jantan dan betina memiliki kesukaan atau preferensi jenis makanan yang sama., Telmatherina antoniae is one of the endemic fish that live in the waters of Lake Matano. This fish is commonly called opudi by the surrounding community. The study of food and feeding habits of opudi fish is an important source of biological information to be carried out as an effort to protect Telmatherina antoniae fish in the wild. This study aims to get the information about food and eating habits of Telmatherina antoniae fish in Lake Matano, South Sulawesi. Fish sampling was carried out in litoral area of Matano Lake for one year starting from March 2018 to February 2019. The data analysis used was the largest section index, niche area, overlapping, and biometric data related to fish eating habits. The results showed that opudi fish are carnivorous fish with the main food being insects larvae with a IBT value of 25.76 – 89.70. Opudi fish belong to the diurnal group of fish and forage in water bodies as indicated by biometric data in the form of a terminal mouth shape, relative eye diameter of 44%, relative mouth opening width of 38%, and relative gut length of 22% in males and 20 % in females. The male opudi fish has a narrower niche area than the female fish, and between male and female fish have similarity of food preferenc
Keyword: Endemic fish, feeding habits, food, Matano Lakes, Telmatherina antoniae

Judul: Pengembangan Aplikasi Penandaan Digital pada SMS Menggunakan Algoritme MD5-RSA
Abstrak: Cellular phone is one of the most popular communication device. Unfortunately, this popularity also increases number of crime using cellular phone. SMS fraud is one kind of crime using cellular phone. Another method of sender verification is required to avoid this kind of crime. Digital signatures can be used to verify the sender. The sender is sending SMS with digital signature and the receiver will verify the signature. This application is developed using J2ME and MD5-RSA algorithm as the signature method. This application also uses Bouncy Castle lightweight cryptography API for J2ME as cryptography library. Key pair parameters can be generated in 15 seconds to 4 minutes depends on the cellular phone technology. The digital signature can be formed with an average time of 1.35 seconds to 1.97 seconds. Digital signature verification can be done with an average time of 3.73 seconds to 12.09 seconds. The digital signature is generated using private key parameters and verified using public key parameters. Only the correct key pair will provide a valid result. Time to send signed-SMS depends on the network capability. There is no difference compared to sending normal SMS.
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