Yersinia ruckeri Isolated from Common Mudpuppy Necturus maculosus.

Area of Science:

• * Veterinary microbiology
• * Amphibian pathology
• * Aquatic animal health

Background:

• * Yersinia ruckeri is a significant bacterial pathogen primarily affecting fish populations.
• * The known host range of Y. ruckeri has historically been limited to fish species.
• * Routine health inspections are crucial for monitoring pathogen presence in wild populations.

Purpose of the Study:

• * To report the first isolation and identification of Yersinia ruckeri from an amphibian.
• * To assess the implications of this finding for aquaculture and biosecurity.

Main Methods:

• * Isolation of bacteria from wild-caught common mudpuppies (Necturus maculosus).
• * Confirmation of bacterial identity using biochemical tests.
• * Molecular methods for definitive identification of Yersinia ruckeri.

Main Results:

• * Yersinia ruckeri was successfully isolated and identified from apparently healthy wild common mudpuppies.
• * This is the first documented instance of Y. ruckeri isolation from an amphibian species.
• * The common mudpuppy expands the known host range for this important fish pathogen.

Conclusions:

• * The common mudpuppy can serve as a host for Yersinia ruckeri, a fish pathogen.
• * This discovery necessitates a re-evaluation of biosecurity measures in aquaculture, including wild amphibians.
• * Wild amphibian populations may play a role in the epidemiology of Y. ruckeri.