Judul: Reproductive Biology of Opudi Telmatherina antoniae Kottelat, 1991 in Matano Lake, South Sulawesi
Abstrak: Ikan opudi (Telmatherina antoniae) merupakan ikan endemik Danau Matano yang keberadaannya belum dimanfaatkan secara optimal. Penelitian ini bertujuan untuk menganalisis aspek biologi reproduksi ikan opudi (Telmatherina antoniae Kottelat, 1991) di Danau Matano, Sulawesi Selatan. Sampel ikan opudi diperoleh dari hasil sampling selama Maret 2018-Februari 2019 dan diambil dari 6 stasiun. Sampel dikirim ke Laboratorium Biologi Makro I, IPB. Analisis dilakukan pada bulan April-Juni 2021 dengan ikan yang dianalisis sejumlah 1792 ekor yang terdiri dari 922 ekor jantan dan 870 ekor betina. Nisbah kelamin ikan opudi memiliki perbandingan 1,06:1. Ukuran pertama kali matang gonad jantan yaitu berkisar 48,08- 57,73 mm dan betina yaitu 56,78-68,55 mm. TKG ikan jantan paling dominan ditemukan pada Desember 2018 di Stasiun 6, sedangkan ikan betina pada Desember 2018 di Stasiun 3. Rataan IKG ikan jantan memiliki nilai tertinggi pada Maret 2018 di Stasiun 5 sedangkan ikan betina pada September 2018 di Stasiun 6. Fekunditas ikan opudi memiliki nilai rata-rata 650±270 butir telur. Nisbah kelamin ikan opudi jantan dengan betina mengalami kondisi yang seimbang. Ikan opudi jantan memiliki kondisi matang gonad dengan ukuran yang lebih kecil dibandingkan ikan betina. Ikan opudi diduga mengalami pemijahan sepanjang tahun dengan puncak pemijahan pada bulan Maret dan memijah di sekitar Sungai Petea dan Tanah Merah. Potensi reproduksi ikan opudi diperkirakan berjumlah 179-1690 butir telur dan berdasarkan distribusi ukuran diameter telur, ikan opudi memiliki tipe pemijahan partial spawning., The locally called telmatherinid Opudi (Telmatherina antoniae) is an endemic fish inhabiting Matano Lake where the species has not optimally exploited yet. This research was aimed to analyze the reproductive biology of this fish which particularly focused on gonads and eggs development along the size. Fish sample was collected during March 2018 to February 2019 and taken from 6 stations. The speciments were transported from the field to Laboratory of Macro Biology I at IPB University, Bogor. The analysis was carried out in April-June 2021 with 1792 fish, consisting of 922 males and 870 females. The results showed that sex ratio of opudi fish had a 1.06:1 ratio. The gonad maturity stage showed that most dominant male fish were found in Station 6 at December 2018, while female fish were in Station 3 at December 2018. The gonad maturity index of male fish had the highest value in Station 5 at March 2018 while female fish in Station 6 at September 2018. Length at first maturity was 48.08-57.73 mm and 56.78-68.55 mm for males and females, respectively. The opudi fish fecundity has an average value of 650±270 eggs. Sex ratio of opudi fish experienced balanced conditions. Male opudi fish have a mature condition of gonads with smaller size compared to female fish. Opudi fish are supposed to spawn throughout the year with the spawning peak in March and they have spawned around Sungai Petea and Tanah Merah. Based on eggs counting, the reproductive potential range between 179-1690 eggs. Based on the distribution of the egg diameter, their reproductive strategy tend to be partial spawning.
Keyword: Danau Matano, Opudi, Reproduksi, Telmatherina antoniae

Judul: Biologi Reproduksi Ikan Opudi Telmatherina sarasinorum Kottelat, 1991 di Danau Matano, Sulawesi Selatan
Abstrak: Ikan Opudi (Telmatherina sarasinorum) merupakan spesies endemik yang mendiami perairan Danau Matano, khususnya pada daerah litoral. Hampir satu dekade belum ada pembaharuan terkait aspek biologi reproduksi ikan ini, yang mungkin terjadi perubahan terhadap aspek biologi reproduksinya. Penelitian ini bertujuan untuk menganalisis aspek biologi reproduksi ikan opudi Telmatherina sarasinorum di Danau Matano, Sulawesi Selatan. Pengambilan sampel menggunakan metode acak sederhana. Penelitian dilakukan pada September 2020- Mei 2021 dengan jumlah sampel yang digunakan sebanyak 1760 ekor individu dari 2122 ekor individu, yang terdiri dari 1212 ekor jantan dan 548 ekor betina. Hasil penelitian menunjukkan nisbah kelamin ikan opudi di alam adalah tidak seimbang. Ukuran pertama matang gonad ikan betina lebih kecil dibandingkan ikan jantan. Potensi reproduksi berkisar antara 80-507 telur, dengan rata-rata 228 telur dalam satu batch, spesies ini termasuk dalam kelompok partial spawning. Lokasi pemijahan diduga di S. Lawa, P. Salonsa, Utuno, dan Tanah Merah atau di sekitar wilayah selatan Danau Matano. Ikan memijah disepanjang waktu dengan puncak musim pemijahan pada bulan April, Juli, September dan Desember., Opudi fish (Telmatherina sarasinorum) is an endemic fish species inhabiting Lake Matano, especially in littoral areas. Almost a decade no update regarding the reproduction biology aspects of this fish, may there is a change in their reproduction biology aspects. The aim of the study was to analyze the reproduction aspects of opudi fish Telmatherina sarasinorum in Lake Matano, South Sulawesi. Sampling method was carried out using simple random sampling method. The study was conducted in September 2020-May 2021, of which 1760 individual fishes from 2122 individual fishes, consisting of 1212 males and 548 females were obtained. The results showed that sex ratio of opudi fish in nature was unbalanced. Size of the first gonad maturity of female fishes is smaller than male fishes. Reproductive potential shown by eggs number ranged between 80-507 eggs, with 228 eggs in average in batch, this species is categorized into partial spawning. Spawning ground is presumed in S. Lawa, P. Salonsa, Utuno, and Tanah Merah or around the southern region of Lake Matano. The fish spawning all the time, with peak spawning season in April, July, September and December.
Keyword: Endemic, Lake Matano, Opudi, Reproduction, Sarasinorum

Judul: Pengenalan Wajah Dengan Menggunakan Transformasi Fourier Dan Fungsi Jarak Euclidean
Abstrak: Nowadays, along with the improvement of technology and the demand of time, computer usage in performing fast computation, attracts many groups of people. Face recognition is a quite interesting area, which is commonly use on the security system or other applications that require face recognition as a feature. Face recognition implemented as computer system becomes necessary to accommodate human limitations in computation and availability. This research using Fourier transform and Euclidean distance as the recognition function. Face recognition held with and without noise. Noise that being used is Gaussian noise.
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