First isolation of Carnobacterium maltaromaticum from farmed Rainbow Trout in Virginia.

Objective: Carnobacterium maltaromaticum is considered an emerging pathogen of salmonids in the United States and around the world.

Methods: Bacterial cultures obtained from the posterior kidney and skin of moribund Rainbow Trout Oncorhynchus mykiss from a commercial aquaculture facility in Virginia, USA, grew C. maltaromaticum, which was confirmed by additional phenotypic and molecular characterization.

First isolation of Flavobacterium psychrophilum from wild adult Great Lakes lake whitefish (Coregonus clupeaformis).

Lake whitefish (Coregonus clupeaformis; LWF) is an economically and ecologically valuable native species to the Great Lakes, but recent declines in their recruitment have generated significant concern about their future viability. Although studies have sought to identify factors contributing to declining recruitment, the potential role(s) of infectious diseases has not been thoroughly investigated. In 2018 and 2019, adult LWF were collected from Lakes Superior, Michigan, and Huron for clinical examination and bacteriological analyses.