28 Table 3 Effect of Maintenance Time of Bluegill in Laboratory Aquaria on Differential White Cell Counts of Hypaque-Ficoll Isolated Anterior Kidney Cells Percent3, Maintenance Time Lymphocyte^ Blast-like 1 day 100 0 3 weeks 50-60 50-40 (a) Results are expressed as a percent of the total number of white cells counted. (b) Cytocentrifuged preparations of Hypaque-Ficoll separated blood samples were stained with May-Grunwald-Giemsa for quanti tation.