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| Figure 1: Intensity of Ichthyophthirius multifiliis trophonts in skin of rainbow trout. Parasites (white spots) were counted on the surface of whole fish 10 days after exposure to infective theronts in groups of fish fed for 14 and 45 days with different concentrations of β-glucan. *: Significant differences compared to control fish (p < 0.05). |
