Peripheral blood leucocytes were examined for their fine structure and their in vivo response to colloidal carbon particles and bacteria, Aeromonas salmonicida. Four main types of leucocyte were identified: lymphocytes, thrombocytes, monocytes and granulocytes. Previously, two types of granulocyte had been identified but at the electron microscope level a third type could be distinguished in the peripheral blood. Monocytes and the type 1 and type 3 granulocytes were found to be phagocytic.
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Doggett et al. (1989) studied this question.
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