Judul: Isolation and Identification of Aspergillus sp. in Tilapia (Oreochromis sp.) Sold for Consumption
Abstrak: Penelitian ini mendeteksi keberadaan Aspergillus sp. pada ikan nila yang dijual untuk konsumsi manusia di Desa Pasarean Kabupaten Bogor. Lima puluh ekor ikan diambil sampelnya untuk deteksi keberadaan Aspergillus. Tanda-tanda klinis ikan terkikis sirip, insang, pendarahan, dan luka. Keberadaan cendawan patogen dikonfirmasi melalui swab dari kulit, insang, dan kloaka dan selanjutnya dikulturkan pada Potato Dextrosa Agar (PDA). Pengamatan makroskopis dan mikroskopis dilakukan untuk menentukan spesies Aspergillus. Hasil penelitian menunjukkan terdapat empat spesies Aspergillus yang teridentifikasi, yaitu A. terreus (2%); A. flavus (4%); A. fumigatus (42%); dan A. niger (4%), dan koinfeksi antara A. fumigatus dan A. flavus (2%); koinfeksi A. fumigatus dan A. terreus (2%); dan koinfeksi A. fumigatus, A. flavus dan A. niger (2%). Prevalensi aspergillosis total sebesar 58%. Penelitian lebih lanjut diperlukan untuk meningkatkan pemahaman tentang penyakit cendawan dalam sistem akuakultur, yang mengarah pada strategi pencegahan dan pengendalian yang efektif, sehingga memastikan keamanan dan keberlanjutan praktik akuakultur di Indonesia., This study investigates the occurrence of Aspergillus sp. in tilapia sold for human consumption at Pasarean village of Bogor District. Fifty fish were sampled for Aspergillus detection. The clinical signs of fish are eroded fins, gills, haemorrhages, and wounds. The presence of pathogenic fungi was confirmed through fungal isolation from the skin, gills, and cloaca and subsequent culturing on Potato Dextrose Agar (PDA). Macroscopic and microscopic observations determined the species of Aspergillus. The results show that four Aspergillus species were identified, including A. terreus (2%), A. flavus (4%), A. fumigatus (42%), and A. niger (4%), with the occurrence of coinfection between A. fumigatus and A. flavus (2%), A. fumigatus and A. terreus (2%) and between A. fumigatus, A. flavus and A. niger (2%) giving a total prevalence of 58%. Further research is necessary to enhance the understanding of fungal diseases in aquaculture systems, leading to effective prevention and control strategies, thus ensuring the safety and sustainability of aquaculture practices in Indonesia.
Keyword: Aspergillus sp., aquaculture, threat, pathogenic fungi, tilapia

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: Penggunaan Metode Homotopi untuk Menyelesaikan Persamaan KdV (Korteweg-de Vries)
Abstrak: Natural phenomena can be explained using nonlinear mathematical models. In this paper, we studied the solution of KdV equation using the Homotopy method. The KdV equation is used for describing both surface and internal waves. One of the solutions is called a solitary wave. The use of homotopy method to solve the KdV equation required a nonlinear operator which was determined by the nonlinear form of the KdV equation itself. Based on this operator, a recursive formula was obtained to get a sequence of the KdV solution. The higher the sequence order of the sequence used, the closer to the exact solution of the KdV equation.
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