Environmental factors affecting Edwardsiella ictaluri-induced mortality of riverine ayu, Plecoglossus altivelis (Temminck & Schlegel)

Environmental factors affecting Edwardsiella ictaluri-induced mortality of riverine ayu, Plecoglossus altivelis (Temminck & Schlegel)

© 2021 John Wiley & Sons Ltd.

Bibliographische Detailangaben
Veröffentlicht in:Journal of fish diseases. - 1998. - 44(2021), 8 vom: 30. Aug., Seite 1065-1074
1. Verfasser: Takeuchi, Hisato (VerfasserIn)
Weitere Verfasser: Hiratsuka, Motoyuki, Hori, Kazutomo, Oinuma, Hiroki, Umino, Yoshiyuki, Nakano, Daiki, Iwadare, Mayu, Tomono, Ryuji, Imai, Toshihiro, Mashiko, Hirohito, Namba, Aki, Takase, Tomohiro, Shimizu, Sonoko, Nakai, Toshihiro, Mano, Nobuhiro
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2021
Zugriff auf das übergeordnete Werk:Journal of fish diseases
Schlagworte:Journal Article Plecoglossus altivelis Edwardsiella ictaluri infection ayu epidemiology mortality water temperature
Beschreibung
Zusammenfassung:© 2021 John Wiley & Sons Ltd.
We analysed the predisposing factors for Edwardsiella ictaluri infection in the riverine ayu Plecoglossus altivelis on the basis of environmental and epidemiological data obtained in a tributary to and the lower reaches of the Tama River, Japan, in July and August 2011-2015. Mortality of ayu due to E. ictaluri infection was observed only in the tributary in August 2012 and 2013; both periods were unusually hot. During these mortality events, daily average water temperatures rose approximately 3-4°C over 4-8 days, reaching the optimum temperature for E. ictaluri infection (>25°C) and approaching the upper tolerable limit for ayu (30°C). Diurnal water temperature ranges (DWTRs) in the tributary during the mortality events exceeded 6°C, which was 1-2°C greater than in the lower reaches. Experimental infection of ayu with E. ictaluri resulted in higher mortality when exposed to 6°C DWTR than to 4°C DWTR. Furthermore, water levels in the tributary were generally low in August 2012 and 2013 because of low rainfall. From these results, we conclude that unusually high-water temperatures combined with high DWTRs and low water levels drove riverine ayu mortality from E. ictaluri infection
Beschreibung:Date Completed 23.07.2021
Date Revised 23.07.2021
published: Print-Electronic
Citation Status MEDLINE
ISSN:1365-2761
DOI:10.1111/jfd.13368