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    CULTURE- AND POLYMERASE CHAIN REACTION-BASED DETECTION OF Flavobacterium psychrophilum IN NATURALLY INFECTED RAINBOW TROUT (Oncorhynchus mykiss walbaum, 1792) FROM TROUT FARMS
    (2023) Özcan, Filiz; Arserim, Neval Berrin; Ketani, Muzaffer Aydın; Aydın, Kasım; Sever, Nurdan Karacan; Özcan, Nida; Çelik, Burçak Aslan
    The present study aimed to detect Flavobacterium psychrophilum in fish samples collected from rainbow trout (Oncorhynchus mykiss Walbaum 1792) farms in the Southeastern Anatolia region of Türkiye by means of bacteriological culture and polymerase chain reaction and to investigate the antibiotic susceptibility of the causative bacteria. A total of 40 trout farms located in Diyarbakır, Adıyaman, Şanlıurfa, and Batman provinces were visited, and 1200 samples were examined. During January and February 30 fish with an average live weight of 200–250 g were collected from each farm. Samples were obtained from the liver, spleen, kidneys, and tissues following macroscopic laboratory examination of the specimens. Antibiotic treatment is the treatment of choice owing to the lack of an effective vaccine in the control of the disease. Therefore, it is important to rapidly identify the bacterial species and investigate its susceptibility to antibiotics. In this study, the causative bacteria were detected in 5 out of 40 farms. The causative bacteria infected the liver, kidney, and tissues. The sensitivity of Enrofloxacin (5 microgram (µg)), Florfenicol (30µg), Neomycin (5µg), Amoxicillin (25µg), Oxytetracycline (30µg), Erythromycin (10µg), Gentamycin (5µg), Streptomycin (5µg) and Nalidixic acid (10µg) were defined at chancing ratios. In conclusion, these bacteria were detected in regional farms, which should minimize the stress factors by avoiding overstocking and following the required hygiene rules.
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    Detection of Yersinia ruckeri in naturally infected rainbow trout (Oncorhynchus mykiss Walbaum, 1792) from trout farms in Anatolia, Turkey
    (Univ Zulia, Facultad Ciencias Veterinarias, 2023) Ozcan, Filiz; Arserim, Neval Berrin; Ketani, Muzaffer Aydin; Aydin, Kasim; Karacan-Sever, Nurdan; Ozcan, Nida; Aslan-Celik, Burcak
    The present study aimed to detect Yersinia ruckeri bacteria in fish samples collected from the rainbow trout (Oncorhynchus mykiss, Walbaum, 1792) farms in the South Eastern Anatolia Region of Turkey through bacteriological culturing and polymerase chain reaction. Separate visits were made to trout farming facilities in Diyarbakir, Adiyaman, Sanliurfa, and Batman in January and February 2021, and 30 fish with an average live weight of 200-250 g were collected from each facility. A total of 1,200 samples were taken from 40 trout farms. Liver, spleen, kidney, and tissue specimens were collected from rainbow trout. Yersinia ruckeri was isolated from the kidney, liver and muscle tissue of fish on McConkey Agar for bacteriological examinations. Isolated strains were identified by MALDI-TOF and PCR. It was detected the bacteria in the liver, kidney, and muscle tissue samples of fish from 23 out of 40 farms. In conclusion, these bacteria were detected in local farms. These farms must implement vaccination, minimize stress factors affecting the fish, and avoid overstocking. The best methods to protect against infection include avoiding overstocking, low oxygen levels, and underqualified labor force.