Judul: Rekayasa rematurasi ikan patin siam Pangasianodon hypophthalmus dengan penyuntikan hormon PMSG dan HCG serta penambahan vitamin mix 300 mg/kg pada pakan
Abstrak: The research was carried out from April to June, 2010 at Babakan Field LaboratoryPonds, Darmaga. The research aimed to increase the rematuration process rate on striped catfish Pangasianodon hypophthalmusthrough a combination of Pregnant Mare Serum Gonadotropin(PMSG)and Human Chorionic Gonadotropin (HCG) hormone injection with 5 and 2,5 IU; 10 and 5 IU;also 20 and 10 IU/kgof spawner body weight dosage combinedwith vitamin mixaddition to fish feed. Sixteen femalestriped catfish spawner were used, consisting of twelve PMSG-treatedspawner and 4 control spawner.This researchused one way single ANOVA with 4treatments and 3 replications. Statistic analysis of observed variables showed unsignificant differences among the three treatments in rematuration parameters. It was resulted that rematuration rate was increased in treatedspawners indicated by a 100% pregnancy. Spawners treated with 10 IU PMSG and 5 IU HCG/kg of spawner body weight along with 20 IU PMSG and 10 IU HCG/kg of spawner body weight dosage was able to reach maturity and spawned with the larval survival rate on the fourth day at 98,63% and 84,81% respectively, thus making 10 IU PMSG and 5 IU HCG/kg of spawner body weight as the best dosage.
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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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