Judul: Keberadaan Cacing Parasitik dan Bakteri pada Insang serta Saluran Pencernaan Ikan Nila Bogor Enhanced Strain Tilapia (Oreochromis niloticus)
Abstrak: This study aimed to identify the type of a parasitic worms and bacteria in gills and digestive tract of Bogor Enhanced Strain Tilapia Fish (Oreochromis niloticus) by conventional methods. A group of 10 fishes of sample BEST tilapia were used, each gills and digestive tract was collected. The parasitic worms were colored with KOH and clove oil for nematode worm, and Semichon’s Acetocarmine staining for trematode worms. Differentiations and characterizations of variants isolate were based on biochemical reactions and Gram staining technique. Parasitic worms that can be identified from gills were Dactylogyrus sp. and Pseudodactylogyrus sp., while parasitic worm from digestive tract was Anisakis sp. The bacteria result shows that the gills and digestive tract of BEST tilapia were predominantly contaminated with Aeromonas sp. and followed by Staphylococcus epidermidis and Streptococcus sp.
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Judul: Exploration of Parasites Nile Tilapia (Oreochromis niloticus) from The Local Fish Seller in Dramaga, Bogor
Abstrak: Besarnya komoditas perikanan ikan nila secara nasional terus mengalami peningkatan. Namun, dalam usaha budidaya ikan ini berbagai kendala ditemui, salah satunya adalah penyakit yang disebabkan oleh parasit. Penelitian ini bertujuan untuk mengidentifikasi parasit yang ada pada ikan nila (Oreochromis niloticus) dari toko penjual ikan di Dramaga, Bogor, Jawa Barat. Sampel ikan nila diambil sebanyak 14 ekor dengan rata-rata panjang ± 22 cm dan bobot tubuh ± 195 gram. Sampel diambil dari insang, sirip dada, sirip anal, sirip caudal, sirip dorsal, sisik, dan usus ikan. Sampel diperiksa dengan metode natif. Sampel dari usus dilakukan pewarnaan Ziehl Neelsen. Sampel darah ikan diambil untuk dilakukan ulas darah dan diberi pewarnaan Giemsa. Berdasarkan hasil pengamatan, ditemukan parasit Trichodina sp. sebanyak 85,71% (n=14) dengan intensitas 27,83 individu/ekor dan insang sebagai organ yang paling banyak terinfeksi. Tingkat infeksi parasit yang ditemukan dengan pewarnaan Ziehl Neelsen adalah Myxobolus sp. (57,14%), Cryptosporidium spp. (35,71%), dan Cyclospora sp. (14,29%). Sedangkan, tingkat infeksi parasit darah yang ditemukan yaitu Haemogregarina sp. (50%). Informasi mengenai keberadaan parasit pada ikan nila ini menjadi sangat penting diketahui bagi pembudidaya untuk mengendalikan parasit secara tepat dan efektif., The demand for tilapia fishing goods has recently expanded on a national scale. One of the difficulties this fish farming operation encountered was the parasite-caused illness. The aims of this study were to explore parasites in tilapia (Oreochromis niloticus) from the local fish seller in Dramaga, Bogor, West Java. A total of 14 tilapia were sampled, with an average length of 22 cm and a body weight of 195 grams. Fish gills, pectoral fins, caudal fins, tail fins, dorsal fins, scales, and intestines were collected. The methods used in this study were wet mount examination, gut samples were stained with Ziehl Neelsen, and blood samples from fish were obtained and stained with Giemsa for analysis. The findings revealed that Trichodina sp. (85.71 percent) was present in several organs, with the gills being the most heavily affected organ. The intensity of this parasite was 27.83 individuals/head. The parasites detected by Ziehl Neelsen staining were Myxobolus sp. (57.14 %), Cryptosporidium spp. (35.71 %), and Cyclospora sp. (14.29%). The type of blood parasite found was identified as Hemogregarina sp (50%). Our findings are very important information for initiating the development of a treatment strategy to prevent parasite infection in tilapia fish farms.
Keyword: Oreochromis niloticus, parasit darah, parasit saluran pencernaan, tingkat infeksi

Judul: Truncated Stop Loss as a Optimal Solution of Reinsurance Agreement in One-Period Model
Abstrak: Reinsurance is one of risk management efforts of an insurance company, which is called the cedent. Similar with insurance, reinsurance constitutes the cedent to pay the premium. We consider one-period reinsurance model and derive a rule which minimizes the ruin probability of the cedent for a fixed reinsurance premium. Therefore, it is needed to construct an optimal reinsurance agreement for the cedent. The premium is calculated according to four different principles, i.e. economic, generalized zero-utility, Esscher, and mean-variance principles. Stop loss is a reinsurance contract which protect the insurance company for losses that exceed a certain amount. The result of this research shows that a truncated stop loss is an optimal agreement in the class of all reinsurance contracts with various premiums calculated using above mentioned principles.
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