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New Bacterium Identified In Atlantic Salmon

CHILE - Researchers have isolated a new bacterium for which they propose the name, Chryseobacterium chaponense sp. nov. from Atlantic salmon in Lake Chapo.

Peter Kämpfer of the University of Giessen in Germany and colleagues there and at the Andres Bello University in Chile have published a paper in International Journal of Systematic and Evolutionary Biology, describing their findings a new bacterium in Atlantic salmon in Lake Chapo in Chile.

They explain that two yellow pigmented bacterial strains (Sa 1147-06Tand Sa 1143-06), isolated from the Atlantic salmon (Salmo salar) from the Chapo lake in Chile were studied in a polyphasic approach. Both isolates were very similar and cells were rod shaped and stained Gram-negative.

A comparison of the 16S rRNA gene sequence of both organisms showed 100 per cent identity and 98.9 per cent similarity to Chryseobacterium jeonii JMSNU 14049T. Lower similarities to other Chryseobacterium species were found with 97.5 per cent sequence similarity to Chryseobacterium antarcticum JMNSU 14040T. 16S rRNA gene sequence similarities to all other Chryseobacterium species were below 97.3 per cent.

The fatty acid profile of strain Sa 1147-06T consisted of the major fatty acids C13:0 iso, C15:0 iso, C15:0 anteiso, C17:1 iso 9c, with C15:0 iso 3-OH, C16:0 iso 3-OH, and C17:0 iso 3-OH as major hydroxylated fatty acids.

DNA-DNA hybridisations with C. jeonii JMSNU 14049T and C. antarcticum JMNSU 14040T resulted in similarities of 20.7 per cent (reciprocal 15.1 per cent) and 15.7 per cent (reciprocal 25.7 per cent), respectively.

These DNA-DNA hybridisation results and the differentiating biochemical properties showed, that strains Sa 1147-06T and Sa 1143-06 represent a novel species, for which the name Chryseobacterium chaponense sp. nov. is proposed. The type strain is Sa 1147-06T (= DSM 23145T, = CCM 7737T).

Reference

Kämpfer P., K. Fallschissel and R. Avendañ-Herrera. 2010. Chryseobacterium chaponense sp. nov., isolated from Atlantic salmon (Salmo salar) farmed in Chapo lake, Chile. International Journal of Systematic and Evolutionary Biology, volume 60. DOI 10.1099/ijs.0.022004-0

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