Some changes in the blood cells of diseased coho salmon

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Abstract
Blood samples were taken from fingerling coho salmon (Oncorhynchus kisutch) that had been experimentally infected with either the bacterial pathogen causing vibriosis or that causing bacterial kidney disease. In the 2nd week after inoculation, smears from the Vibrio-infected fish contained enlarged thrombocytes, pinched erythrocytes, and neutrophils with vesicles. The total number of thrombocytes was reduced to 8000 per microlitre, though this returned to 20 000 per microlitre in the 3rd week in those fish that survived.Blood smears from fish given the kidney disease bacterium contained enlarged thrombocytes and what appeared to be collapsed reticulocytes, in the 2nd and 3rd weeks. The thrombocyte count averaged 6500 per microlitre, and there were reduced numbers of other cells. Bacteria were found in thrombocytes, neutrophils, and monocytes.Light micrographs of 26 normal or modified cells and electron micrographs of two granulocytes are included.

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