An electron microscopic study was performed on leucocytes from circulating blood of the goldfish. The leucocytes were divided into eight types: neutrophil, eosinophil, large granular leucocyte (LGL), medium-sized granular leucocyte (MGL), small granular leucocyte (SGL), fine granular leucocyte (FGL), lymphocyte, and monocyte. In this report the thrombocyte was excluded from leucocytes, and LGL, MGL, SGL and FGL were tentatively classified based on the size of intracytoplasmic granules possessed by each cell. The existence of goldfish monocytes was electron microscopically demonstrated for the first time in the present report.

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