Judul: Peran Tepung Darah sebagai Fe Organik pada Pakan dalam Meningkatkan Imunitas Ikan Kerapu Bebek Cromileptes altivelis
Abstrak: The problem that was dealt in the grouper culture was the stress condition caused by the decrease of water quality (environmental stress). If this happen, amount of the pathogen bacteria in grouper will increase so will impact in decline of appetite and immunity response. The further problem was the limitations of the waste fish as main food the grouper. As the replacement, normally was used pelet. But, evidently the production of the fish-meal as the main raw material the compiler pelet that was expensive and continued the production reduction in the period for the last 10 years enabled to look for the alternative to the use of the fish-meal as the food raw material. Blood meal was one of the raw materials of the fish-meal of replacement food. Apart from having the content of high protein (89-92 %), blood meal also had the iron content that was high reached 2769 mg/kg. The iron content that was high could it was hoped increase the response of fish immunity if stress happening. Furthermore, the height of protein could it was hoped encourage the growth of the fish. The research was carried out in the month May-October 2009 took place in the Station Field Center of the Study of Knowledge of Fisheries Institut Pertanian Bogor (PSIK IPB) Ancol, North Jakarta. This research used the random plan complete (RAL) with five treatments and respectively the treatment used three tests. The amount of blood meal that was used was 0%, 9%, 12%, and 15%. Commercial food was used as the standard. The beginning weight in general the fish that was tested was 11,6 0.23 g. The maintenance was carried out for 40 days density 10 tails/litre and was given food 3 times a day in struck 07,00, 12,00, and 17,00 WIB in an at adsatiation (until the fish was full). After 40 maintenance days, the fish was taken totalling 3 tails to be carried out by the analysis proksimat and to count retention of protein and his fat. Further, was carried out by the test about towards the bacterial infection Vibrio algynolitycus to know the level of resistance of the fish body. Observation of the health of the fish was carried out through the taking of the sample of fish blood on the day 0, that is before the infection and on the 3rd day, on the 5th day, and on the 9th day after infection. For 40 treatment days with the use of blood meal to the fish, was received by results that were not different real towards the parameter of the amount of consumption of food, retention of protein, retention of fat, the growth rate of the daily, and food
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Judul: Viabilitas juvenil ikan kerapu bebek Cromileptes altivelis terhadap infeksi bakteri Vibrio alginolyticus setelah diberi pakan kadar Fe berbeda
Abstrak: Humpback grouper (Cromileptes altivelis) culture potentially against the problem of pests and diseases.Vibrio bacteria which causes vibriosis is the main problem for humpback grouper culture industry which cause the death of fish. The use of iron as a mineral that works in the blood cells could be expected to affect viability of humpback grouper against the disease. The fish was cultured in 60x40x50 cm aquarium reared for 40 days, and stoked at a density of 10 ind./aquarium, it weight was 9.44±0.36 gram/ind. The experiment diet contained different iron supplementation level which are 0 ppm, 100 ppm and 500 ppm. The feed was given 3 times daily at a satiation. After 40 days culture feeding, the fish was exposed in fresh water for 10 minutes and injected by 108 CFU/ml Vibrio alginolyticus. The feeding of iron supplementation (Fe) 0 ppm, 100 ppm, and 500 ppm did not significantly affect specific grow rate and survival rate of humpback grouper before the bacterial infection. After the bacterial infection, the fish fed by diet containing 100 ppm Fe had better viability.
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Judul: Bifurkasi Hopf pada Model Siklus Bisnis Kaldor Kalecki tanpa dan dengan Waktu Tunda
Abstrak: Business cycle model is one of dynamical system models in economic. One of the business cycles model is Kaldor-Kalecki model. Kaldor-Kalecki business cycle model that is written in delayed defferential equations, is a business cycle model that involves gross product and capital stock of a company. In this paper Kaldor-Kalecki business cycle model is analyzed using both nondelay and delay in time of capital stock. By Taylor expansion for the time delayed model, an analysis of stability around the fixed points has been done. Furthermore, by using Hopf bifurcation theorem, it can be shown that there exists periodic orbits and limit cycle. In the nondelayed model, changing the parameter of goods market could lead to the occurrence of Hopf bifurcation and the existence of limit cycle. Similarly, for the delayed model, it has been shown that changing the time delay parameter may result in the occurrence of Hopf bifurcation and limit cycle.
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