Seasonal occurrence of the infectious stage of proliferative kidney disease (PKD) and resistance of rainbow trout, Salmo gairdneri Richardson, to reinfection

J. S. Foott, Ronald Hedrick

Research output: Contribution to journalArticle

69 Citations (Scopus)

Abstract

The seasonality of proliferative kidney disease (PKD) in rainbow trout, Salmo gairdneri Richardson, at the American River Hatchery, California was found to be primarily dependent on the presence or absence of the infectious stage in the water supply. This was determined by introducing sentinel trout into the hatchery water supply on a monthly basis, followed by their transfer to the laboratory for subsequent holding in 18° C, pathogen‐free water for one month prior to examination. These exposures demonstrated that infections were obtained from April through October at ambient temperatures 12–20° C. Trout which had recovered from clinical infections were found to be resistant to reinfection. Resistance was induced by active infection and not just previous exposure to the infectious stage. Trout surviving PKD were also found to harbour later sporogonic stages of the parasite for at least one year following initial infection, but fully formed spores, as judged by well‐developed valves, were not observed.

Original languageEnglish (US)
Pages (from-to)477-483
Number of pages7
JournalJournal of Fish Biology
Volume30
Issue number4
DOIs
StatePublished - Jan 1 1987

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kidney diseases
rainbow
Oncorhynchus mykiss
trout
hatchery
infection
hatcheries
water supply
seasonality
spore
ambient temperature
parasite
harbor
spores
parasites
rivers
river
water
temperature
exposure

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Aquatic Science

Cite this

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abstract = "The seasonality of proliferative kidney disease (PKD) in rainbow trout, Salmo gairdneri Richardson, at the American River Hatchery, California was found to be primarily dependent on the presence or absence of the infectious stage in the water supply. This was determined by introducing sentinel trout into the hatchery water supply on a monthly basis, followed by their transfer to the laboratory for subsequent holding in 18° C, pathogen‐free water for one month prior to examination. These exposures demonstrated that infections were obtained from April through October at ambient temperatures 12–20° C. Trout which had recovered from clinical infections were found to be resistant to reinfection. Resistance was induced by active infection and not just previous exposure to the infectious stage. Trout surviving PKD were also found to harbour later sporogonic stages of the parasite for at least one year following initial infection, but fully formed spores, as judged by well‐developed valves, were not observed.",
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