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Ichthyobodo necator (Costia) are attached to the gill surface (arrow) of a yearling sockeye salmon, Oncorhynchus nerka. Note hypertrophy and hyperplasia of the lamellae epithelium. May-Grünwald Giemsa (M-G G) stain. X800. Image size: 5240w x 3535h (72 dpi); 72.778 in. x 49.097 in.