{"title":"Host-specific Infectivity of <i>Flavobacterium psychrophilum</i> Strains Isolated from Ayu and Rainbow Trout","authors":"Erina Fujiwara-Nagata, Yuki Naitou-Shibahara, Yoshitaka Kataoka, Hiroaki Kintsuji, Mitsuru Eguchi","doi":"10.3147/jsfp.58.91","DOIUrl":null,"url":null,"abstract":"Flavobacterium psychrophilum can infect rainbow trout Oncorhynchus mykiss and ayu Plecoglossus altivelis, detrimentally affecting global aquaculture. This study aimed to understand the infectivity and host specificity of two F. psychrophilum strains, SG950607 and PH0424, which were isolated from the kidneys of rainbow trout and ayu, respectively. Rainbow trout (fry) and ayu (adult and fry) were infected via two methods: bath immersion and intraperitoneal injection. We investigated the ability of each F. psychrophilum strain to survive in the serum of non-original host fish species. Rainbow trout died upon being infected by PH0424. In addition, the complement of the rainbow trout did not show a bactericidal effect against PH0424. On the other hand, ayu infected with SG950607 survived, and their complement eliminated this strain. The difference in mortality rates is likely associated with the susceptibility of each strain to the complement activity possessed by the host fish.","PeriodicalId":51052,"journal":{"name":"Fish Pathology","volume":"8 1","pages":"0"},"PeriodicalIF":0.6000,"publicationDate":"2023-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Fish Pathology","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.3147/jsfp.58.91","RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"FISHERIES","Score":null,"Total":0}
引用次数: 0
Abstract
Flavobacterium psychrophilum can infect rainbow trout Oncorhynchus mykiss and ayu Plecoglossus altivelis, detrimentally affecting global aquaculture. This study aimed to understand the infectivity and host specificity of two F. psychrophilum strains, SG950607 and PH0424, which were isolated from the kidneys of rainbow trout and ayu, respectively. Rainbow trout (fry) and ayu (adult and fry) were infected via two methods: bath immersion and intraperitoneal injection. We investigated the ability of each F. psychrophilum strain to survive in the serum of non-original host fish species. Rainbow trout died upon being infected by PH0424. In addition, the complement of the rainbow trout did not show a bactericidal effect against PH0424. On the other hand, ayu infected with SG950607 survived, and their complement eliminated this strain. The difference in mortality rates is likely associated with the susceptibility of each strain to the complement activity possessed by the host fish.
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