Figure 2

Gyrodactylus salaris Malmberg, 1957 on brown trout Salmo trutta L. and grayling Thymallus thymallus (L.). Experimental infection of G. salaris (Fusta strain, haplotype A) on a population of (A) S. trutta (n = 30), from the River Tyne in England, UK; and (B) T. thymallus (n = 30; three replicates of 10 fish each), from the River Nidd in England, UK. The growth on S. trutta and T. thymallus is shown on the same scale for direct comparison. Grey dotted lines represent the number of parasites assessed on each individually marked fish; mean intensity of infection is shown in blue line, including standard error of the mean (SEM).