Judul: Sustainable Harvest Quota Estimation of Asiatic Softshell Turtle (Amyda cartilaginea) in Natural Habitat Case Study of West Java
Abstrak: Labi-labi (Amyda cartilaginea) merupakan reptil yang populasinya di alam cukup banyak sehingga dilakukan pemanenan untuk diperdagangkan baik dalam skala nasional maupun internasional. Kuota pada prinsipnya merupakan pemanfaatan sejumlah populasi yang dapat dipanen dengan mempertimbangkan ukuran populasi aktual yang tersedia di alam dengan tetap menjaga kelestariannya agar tidak punah dan tidak terjadi pemanenan yang berlebihan (overharvesting). Hingga kini, penentuan jumlah labi-labi yang boleh dipanen masih belum ada, khususnya di Jawa Barat, padahal potensi labi-labi di Jawa Barat cukup besar. Populasi akan lestari bila jumlah kematian sama dengan jumlah kelahiran, untuk itu digunakan pendekatan Minimum Viable Population (MVP) sebagai dasar penentuan kuota panen lestari. Nilai MVP didapatkan dari perhitungan parameter demografi (natalitas, mortalitas, struktur umur, ukuran populasi nisbah kelamin dan fekunditas). Selain dengan pendekatan MVP, kuota panen lestari juga dapat diduga dengan pendekatan morfometri (panjang lingkar karapas, lebar lingkar karapas panjang plastron dan lebar plastron). Pengukuran parameter lingkungan juga dilakukan untuk mengetahui kualitas parameter lingkungan yang optimal untuk pertumbuhan labi-labi. Pengambilan data untuk kepadatan populasi labi-labi menggunakan metode Catch Per Unit Effort (CPUE). Selanjutnya, sample labi-labi dibagi berdasarkan kelas umur dan jenis kelamin. Hasil penelitian menunjukkan ukuran populasi yang tertangkap di sungai Mandapraja berjumlah 41 individu (11 tukik, 17 dewasa muda dan 13 dewasa), sedangkan di Sungai Cisaat adalah 65 individu (16 tukik, 28 dewasa muda dan 21 dewasa). Nisbah kelamin di masing-masing kelompok baik di Sungai Mandapraja dan Sungai Cisaat tidak terlalu berbeda jauh yaitu 1:3 (1 jantan dengan 3 betina). Berdasarkan hasil penelitian, parameter demografi di kedua lokasi penelitian berbeda, dimana secara morfometri labi-labi di sungai Cisaat lebih besar dibandingkan dengan di sungai Mandapraja. Sungai Cisaat dan Mandapraja berpotensi untuk dilakukan pemanenan, dimana pemanenan dapat dilakukan sejak tahun ketiga karena laju pertumbuhan intrinsik yang tinggi dengan rincian kuota panen untuk tukik jantan 14 individu, tukik betina 30 individu, dewasa muda jantan 28 individu, dewasa muda betina 59 individu, dewasa jantan 17 individu dan dewasa betina 36 individu. PLK dapat digunakan untuk menduga tingkat reproduktif labi-labi dimana kelas umur yang paling banyak menghasilkan telur dengan kualitas baik adalah dari dewasa (PLK 20-40 cm) dengan rentang usia 9-12 tahun. Berdasarkan hasil penelitian parameter lingkungan, tingkat adaptif labi-labi tinggi sehingga dapat hidup dalam rentang yang luas (cosmopolitan). Tekanan terhadap populasi labi-labi akibat adanya panen komersial dapat ditahan dengan membatasi panen beberapa waktu dalam delapan tahun, sehingga dapat mengalihkan dampak panen dari kelompok kritis seperti betina dewasa yang produktif., Asiatic softshell turtle (Amyda cartilaginea) is a reptile that has large populations in nature, therefore they are often harvested for sale on national and international scales. Quotas are principally the use of several harvestable populations by considering the actual population size available in nature and still maintaining sustainability to keep it from extinction and make sure there is no overharvesting. Until today, the determination of the amount of Asiatic softshell turtle that could be harvested is not available, especially in West Java, Whereas Asiatic softshell turtle potential in West Java is appreciable. The population could be maintained if the death rate is balanced with the birth rate, therefore we use the Minimum Viable Population (MVP) approach as
Keyword: Habitat alami, kuota panen, Jawa Barat, trionychidae

Judul: Pemeliharaan Labi-labi (Amyda cartilagínea Boddaert, 1770) dan Uji Coba Preferensi Pakan Anakan di Penangkaran PT. Ekanindya Karsa, Kabupaten Serang
Abstrak: Softshell turtle (Amyda cartilaginea Boddaert, 1770) is categorized as Appendix II CITES and vulnerable in IUCN Red List Data Book. Captive breeding of this turtle is important to continue their sustainable utilization. PT Ekanindya Karsa was one of the pioneer in captive breeding of this species since 2008. Until now, there reference related to management and maintenance techniques of softshell turtle in captivity are few. This research aims to asess the characteristics of softshell turtle in captivity, document the management and maintenance techniques and analyse feeding preferences especially juveniles. The results will assist wildlife conservation efforts and improve it for the future. Research was carried out at PT. Ekanindya Karsa from July to October 2012. Data collected includes characteristics of shoftshell turtle, which consists morphometry and morphological of shoftshell turtle, maintenance of turtle in captivity and foods preference of juveniles. Nine adult shoftshell turtle (3 males and 6 females), 25 shoftshell turtle eggs, and 45 juveniles between 1 - 3 months were observed. Food tested comprises of tuna, shrimp, spinach and sweet potatoes which are given to 15 juveniles. Level of food intake, growth, cost efficiency and activity of juveniles were measured to assess ideal feeding time with focal animal sampling methods. Mean curved-carapace length of an adults (CCL) is 43.33 cm, curved-carapace wide (CCW) 35.33 cm and body weight 10.11 kg. Juvenil non test consists of three clutches with range of CCL is 4.21 - 4.68 cm; CCM is 3.68 - 4.24 cm and body weights of 9.95 – 12.59 g during hatching. Softshell turtle’s eggs had range of diameter of 2.84 - 3.95 cm and weight of 12.00 - 24.00 grams. Maintenance of turtle in captivity is quite well includes aspects of habitat maintenance, management of food and handling of eggs. However, diseases management has not been handled correctly in the captivity as shown by some untreated diseased adult. Preferred food of 15 juveniles were sweet potato and tuna. Feeding activities were visible in the morning (7.00 – 10.00 am) and evening (7.00 – 10.00 pm).
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Judul: Metrik Einstein (Anti-) Self-Dual Berdimensi Empat dengan Metode Cartan
Abstrak: Gravitational field equation can be formulated in differential forms (differential geometry), which describes gravity as a manifestation of the curvature of space-time. Curvature of space-time is characterized by a metric that satisfies the gravitational field equation. With differential forms it can be formulated the (anti-) self-dual Einstein equation, which is a modification of the Cartan structure in (anti-) self-dual basis. Calculation of (anti-) self-dual metric with (anti-) self-dual Einstein equation is simpler than the calculation using Christoffel symbols.
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