Experimental pathogenicity of Achlya species from cultured Nile tilapia to Nile tilapia fry in Thailand

Hatai, Kishio , and Panchai, Kwanprasert , and Hanjavanit, Chutima , and Rujinanont, Nilubon , and Wada, Shinpei , and Kurata, Osamu , (2015) Experimental pathogenicity of Achlya species from cultured Nile tilapia to Nile tilapia fry in Thailand. AACL Bioflux, 8 (1). pp. 70-81. ISSN 18448143

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Abstract

Experimental infection of Nile tilapia (Oreochromis niloticus) fry using 6 Achlya isolates from cultured Nile tilapia with water mold infections was attempted. The experimental fish were exposed to 1.0 x 102 and 1.0 x 104 zoospores mL-1 of each Achlya isolate after ami-momi treatment. The cumulative mortality rates of fish exposed to 1.0 x 104 zoospores mL-1 of A. klebsiana BKKU1003, and A. diffusa BKKU1012 were 88.8 and 77.7%, respectively. A. klebsiana BKKU1003 was more pathogenic than the other isolates. Histopathological examination of the skin of Nile tilapia fry exposed to 1.0 x 102 zoospores mL-1 of A. klebsiana BKKU1003 showed numerous hyphae grew on the skin surface and some areas of skin were sloughed. The fish exposed to 1.0 x 104 zoospores mL-1 of A. klebsiana BKKU1003 showed massive accumulated hyphae on skin lesions with necrosis of the epidermal cells and the hyphae penetrated from the epidermis to the musculature without granulomatous response surrounding the hyphae. We found that it is possible to infect tilapia fry by exposing them to zoospores of Achlya after the ami-momi treatment. © 2015 BIOFLUX SRL. All rights reserved.

Item Type:Article
Uncontrolled Keywords:Panchai, K., Applied Taxonomic Research Center, Department of Biology, Khon Kaen UniversityKhon Kaen, Thailand; Hanjavanit, C., Applied Taxonomic Research Center, Department of Biology, Khon Kaen UniversityKhon Kaen, Thailand; Rujinanont, N., Department of Fisheries, Khon Kaen UniversityKhon Kaen, Thailand; Wada, S., Laboratory of Aquatic Medicine, School of Veterinary Medicine, Nippon Veterinary and Life Science UniversityTokyo, Japan; Kurata, O., Laboratory of Aquatic Medicine, School of Veterinary Medicine, Nippon Veterinary and Life Science UniversityTokyo, Japan; Hatai, K., Microbiology and Fish Disease Laboratory, Borneo Marine Research Institute, Universiti Malaysia SabahKot Kinabalu, Malaysia
Subjects:S Agriculture > SH Aquaculture. Fisheries. Angling
ID Code:10882
Deposited By:IR Admin
Deposited On:21 Apr 2015 11:35
Last Modified:21 Apr 2015 11:35

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