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Wikipedia definition
1. ColumnarisColumnaris is a symptom of disease in fish which results from an infection caused by the gram negative, aerobic, rod shaped bacterium Flavobacterium columnare. It was previously known by the names of bacillus columnaris, chondrococcus columnaris, cytophaga columnaris and flexibacter columnaris. The bacteria is ubiquitous in fresh water, and cultured fish reared in ponds or raceways are the primary concern – with disease most prevalent in air temperatures above 12–14⁰C.
Read “Columnaris” on English Wikipedia
Read “カラムナリス病” on Japanese Wikipedia
Read “Columnaris” on DBpedia

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