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Experimental evaluation of pathogenicity of Lactococcus garvieae in black rockfish (Sebastes schlegeli)
Sung Hyun Kang1, Gee Wook Shin, Yong Seung Shin
1Institute of Animal Medicine and College of Veterinary Medicine, Gyeongsang National University, Jinju 660-701, Korea.
Abstract:
Black rockfish (Sebastes schlegeli) is an important mariculture species in Korea. The production of this fish is drastically declined due to bacterial diseases, particularly streptococcosis caused by Lactococcus garvieae. The bacterial surface characteristics of SJ7 and TY6 were found to have capsule but not NB13 and YS18. The experiential evaluation of L. garvieae pathogenicity, the capsular isolates showed high cumulative mortality i.e. SJ7 (100%) and TY6 (60%) compared to non-capsular isolates. Based on this result the capsular isolates L. garvieae were highly suspected as the causative agent of streptococcosis in rockfish.
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