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http://dx.doi.org/10.5657/KFAS.2019.0539

Monitoring of Pathogens Detected in Cultured Fishes of Gyeongnam in 2018  

Kang, Ga Hyun (Southeast Fisheries Research Institute, National Institute of Fisheries Science)
Cha, Seung Joo (Southeast Fisheries Research Institute, National Institute of Fisheries Science)
Publication Information
Korean Journal of Fisheries and Aquatic Sciences / v.52, no.5, 2019 , pp. 539-546 More about this Journal
Abstract
The major cultured marine fishes in sea off the coast Gyeongsangnam-do Province, South Korea, were assessed and included 9.3% rockfish Sebastes schlegelii, 7.8% red seabream Pagrus major, and 2.1% rock bream Oplegnathus fasciatus. The number of insurance payments related to disease mortality in cultured fish in 2017 was fourfold that in 2016. Economic loss in aquaculture due to disease in cultured fish is high and represents an important inhibitory factor affecting marine fishery productivity. In 2018, diseases led to severe production losses in several aquaculture species: 40.0% in rockfish, 11.4% in olive flounder Paralichthys olivaceus, 10.0% in filefish Thamnaconus modestus, and 9.3% in red seabream. Fish-parasitic pathogens such as Microcotyle sebastis, Alella spp., and Dactylogyrus spp. enter mainly via the gills and skin surface. Among bacterial pathogens, Vibrio species were most common, with Vibrio harveyi being the dominant species causing infections in these fishes. The bacterium Lactococcus garvieae is thought to exhibit host specificity in fish. The fish species in the present study exhibited a higher tendency for infection by heterologous pathogens than by a single pathogen; therefore, it is necessary to devise new strategies for treating diseases in cultured fish.
Keywords
Monitoring; Cultured fishes; Parasite; Bacteria; Virus;
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