Judul: Rekayasa rematurasi ikan patin siam Pangasianodon hypophthalmus dengan kombinasi penyuntikan hormon PMSG dan HCG serta penambahan vitamin mix 100 mg/kg pakan
Abstrak: The experiment was aimed to increase the rematuration injection of process rate on striped catfish Pangasianodon hypophthalmus through Pregnant Mare Serum Gonadotropin (PMSG) dan Human Chorionic Gonadotropin (HCG) hormone combined with vitamin mix addition to the feed. The experiment was designed with four treatment : (A) Control; (B) PMSG 5 IU and HCG 2,5 IU per kg of fish; (C) PMSG 10 IU and HCG 5 IU per kg of fish; (D) PMSG 20 IU and HCG 10 IU per kg of fish. The fish was fed with commercial pellet which added with 100 mg/kg addition vitamin mix. The result showed that all the fish treatment with hormone mix and vitamin mix have a significant gonadal development, and mature, except control. The fish also have significant on Specific Growth Rate (SGR) and Growth Rate (GR). The dose PMSG 20 IU and HCG 10 IU showed of the optimal treatment for gonadal rematuration for striped catfish.
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Judul: Induksi rematurasi ikan patin siam dengan kombinasi penyuntikan hormon PMSG mix dan penambahan vitamin mix 200 mg/kg pakan.
Abstrak: This research was conducted to obtain a dose of PMSG (pregnant mare serum gonadotropin) that can induce rematuration of striped catfish Pangasionodon hypopthalmus. Induced rematuration was performed using PMSG combined with feeding fish a diet supplemented with vitamin mix 200 mg/kg diet. PMSG dosage given was 5, 10, and 20 IU/kg body weight respectively, induction was done once a week in a 4 weeks period. Control didn’t injected by PMSG. The research resulted that 10 IU dosage induction gave a faster maturation compared to other dosages at the fifth week with 50% of broodstocks are pregnant. Broodstock injected with dosage of 20 IU began to mature gonads at the sixth week. There was one broodstock that has mature gonads at the sixth week, while broodstock injected with dosage of 5 IU immature gonads until the sixth week. Percentage of broodstocks pregnant for all treatment is 100%. Percentage of broodstocks pregnant was counted visually through the observation of the stomach shape and the presence of eggs with cannulation. But not every pregnant broodstock eggs were ready to be fertilized. More over, egg quality were also examined by measuring egg diameter, fecundity, FR (Fertilization Rate), HR (Hatching Rate), and SR (Survival Rate). Broodstock fecundity was measured 157576 ± 34284 (10 IU) and 290909 (20 IU). While FR, HR, and SR values are 35.57 ± 10.79%; 44.30 ± 13.87%; 79.81 ± 13.87% (10 IU), and 54.28%; 78.81%; 90.51% (20 IU) respectively. Egg diameter was in a range of 0.724 ± 0.062 – 0.94 ± 0.374 mm. Furthermore striped catfish rematuration rate could be increased by PMSG injection. Premix addition increased egg quality in terms of egg diameter, fecundity, FR, HR, and SR of produced larva. Induced rematuration with PMSG suspected to be able to support increase in national striped catfish fry production.
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Judul: Karakteristik curah hujan DKI Jakarta dengan metode Empirical Orthogonal Function (EOF)
Abstrak: Curah hujan di Indonesia dipengaruhi oleh monsun yang digerakan oleh adanya sel tekanan tinggi dan sel tekanan rendah di benua Asia dan Australia secara bergantian. Dalam bulan Desember hingga Februari (DJF) dibelahan bumi utara terjadi musim dingin akibatnya terdapat sel tekanan tinggi di Benua Asia, sedangkan dibelahan bumi selatan pada waktu ini terjadi musim panas, akibatnya sel tekanan rendah di benua Australia. Karena ada perbedaan tekanan udara di kedua benua tersebut maka pada periode DJF bertiup angin dari tekanan tinggi di Asia menuju ke tekanan rendah di Australia, angin ini disebut monsun barat (winter monsoon). Dalam bulan Juni hingga Agustus (JJA) terdapat sel tekanan rendah di Asia dan sel tekanan tinggi di Australia yang menggerakan monsun timur (suntnter monsoon).
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