湿片镜检，鼠鱼皮肤柱状兵鲇 (Corydoras)

Photomicrograph of skin from a Corydoras catfish showing haystacks of Flavobacterium columnare. Closer examination of the haystacks shows numerous filamentous, motile bacteria. All of the golden-brown material in this image is bacteria. Unstained wet mount, original magnification, 100×.