Judul: Upaya Pemijahan Ikan Belut Sawah (Monopterus albus)
Abstrak: Ricefield eel in Indonesia has not been able to satisfy the demand because they still depends on the seeds from the wild, so it is not sustainable. This problem happens because information about reproduction and sexuality are still unclear. In addition, eels are also identified as hermaphrodite. Therefore, researches about spawning effort of ricefield eels are needed. This study aimed to explore how to breed the ricefield eel (Monopterus albus). This study’s activities consist of male and female determination, identification of gonad maturity, naturally spawning effort, and spawning effort with hormonal stimulation. The data in this study are discussed descriptively. The treatments are dissecting 60 eel samples with 4 different size ranges microscopically (acetocarmine method) and macroscopically to determine sex and gonad maturity. Natural spawning efforts made on artificial pond with a different sex ratio for 2 months. Injuced spawning was done by ovaprim injection intramuscularly to the female broodstocks using doses of 0.5 mL/kg and 0.7 mL/kg broodstocks with 2 replications. The results showed that female individuals have a total length of less than 40 cm, while the male individuals have a total length more than 50 cm. Eels with a total length between 40.5 to 50 cm are intersex as the phase transition from female to male. Females or males mature and ready for spawning can not be characterized morphologically. Natural spawning has been successfully done with the male and female ratio of 1:4 at density of 3 individual/m2. Artificial spawning using hormone injection at doses of 0.5 mL/kg and 0.7 mL/kg broodstocks failed to stimulate ovulation.
Keyword: 

Judul: Induksi Maturasi Belut Sawah (Monopterus albus) Secara Hormonal
Abstrak: Rice field eel (Monopterus albus) fish, often there is a failure in the process of and spawning. Rice field hormones Pregnan Mare Serum Gonadotropin (PSMG), human chorionic gonadotropin (hCG) and antidopamine (AD). maturation and determine the status sex completely randomized design (RAL) with seven treatments and seven as: Controls (0.95% NaCl of fish, AD 0.01 mg/kg of fish, PMSG 20 IU/kg+AD 0.01 mg mg/kg weight of fish. Aquarium used as many seven pieces with size cm. The result is best hormone combination treatme with hormone concentrations of estradiol 0.17 to 4.36%; HSI values maturity level TKG IV pregnancy rate 100%; contained in PMSG stimulates an increase FSH, estradiol caused performance of the enzyme aromatase process faster for 4 weeks, look at increasing GSI, H maturity, fecundity, body weight gain conclusion of this study is the induction of maturation eel rice can be done with PMSG 20IU+AD 0.01 mg/kg with a length of 22±2 cm results are females (mature) Keywords: Rice field eel, maturation, PMSG, hCG, antidopamine SUMMARY PUTRA. Hormonal Induction maturation of Rice albus). Guided AGUS OMAN SUDRAJAT and NUR are hermaphroditic protogynous. In the female final gonadal maturation, ovulation eel with a total length of 22±2 cm by inject This study aimed to induce gonadal of rice field eel. This study uses a reaply NaCl), PMSG 20 IU/kg weight of fish, hCG 20 IU/kg weight /PMSG 20 IU/kg+hCG 10 IU/kg weight of fish, mg/kg weight of fish, and hCG 20 IU/kg of treatment PMSG and antidopamin estradiol-17β 235.2 to 35.43 pg/ml; GSI values 2.07 to 3.52%; egg diameter 0.48 to 3.07 mm; gonad G IV; fecundity 128 eggs; length 0 cm; weights ; and sex status all female. This result because estradiol-17β concentration ormance so that affects vitellogenesis HSI, egg diameter, gonad was observed and sexual status injection for four weeks. Sex status of rice field eel and weight of about 5 g until 12 g hormonal induction mature).
Keyword: 

Judul: Closed Knight’s Tour pada Papan Catur Berbentuk Persegi Panjang dengan Ukuran Maksimal 8 × 8
Abstrak: Closed Knight’s Tour merupakan langkah kuda yang mengunjungi setiap kotak pada papan catur tepat satu kali dengan langkah kuda berawal dan berakhir pada kotak yang sama. Graf yang terbentuk dari closed knight’s tour dinotasikan sebagai graf G(m,n), dengan m adalah banyaknya baris dan n adalah banyaknya kolom. Graf tersebut memuat Hamiltonian cycle. Sebuah graf terhubung G adalah graf bipartite jika dan hanya jika graf tersebut tidak memiliki cycle dengan panjang ganjil. Papan catur yang memenuhi syarat cukup untuk memiliki closed knight’s tour adalah papan catur berukuran 5 × 6, 5 × 8, 6 × 6, 6 × 7, 6 × 8, 7 × 8, dan 8 × 8.
Keyword: bipartite, closed knight’s tour, hamiltonian cycle, knight’s tour, teori graf