Bacteria thi tham hai koet khong pla namchut bang chanit.
Phatchari Sunthonnan | Sawitri Limthong | Wirot Watthanakun
Some of fresh water fishes such as catfish (Clarius batrachus) murrel (Opicephalus striatus) and pearl goby (Oxyeleotris Marmoratus) in many fish farms at Smutsongkram, Nakhon Phathom, Singburi, Chainart, Uthaitani and Nakhonsawan were infected with some bacteria. The diseased fishes were found both in a big pond and in wooden cage. Some infected catfishes had generalized lesions spreading on the skin and on surface muscular tissues, and some had local lesions swell or boil with blood and the microorganisms destroyed deeper in mascular tissues. The lesions of infected murrels ordinarily developed at the lateral site of the body near the caudal fin. Most of the lesions were pale red containing blood along the scales. Antemortem examination revealed the decomposition of muscular tissues near the caudal fin which had external lesions. Some inner organs at this site were decomposed also. Compared with the other area which had no external lesions, the tissues and organs were not decomposed. The diseased murrels with necrotic tissues at the caudal fin could not swim. The infected pearl goby had skin lesions with a small wound at the pelvic fin and caudal fin. Most of the lesions were pale red containing blood along the scales. Some had blood wound and scale erosion. The isolated bacteria from the lesions were identified, they were Aeromonas hydrophila and Aeromonas salmonicida. For the sensitivity test, these bacteria were sensitive to kanamycin, streptomycin, tetracycline, chloramphinical oxytetracycline neomycin and polymyxin B, and resistance to colistin penicillin ampicillin and novobiocin.
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