Figure 3

Distribution of Gyrodactylus salaris Malmberg, 1957 on the fins and body of the four salmonids. The distribution of G. salaris (Fusta strain, haplotype A) on the fins and body of a population of: (A) Atlantic salmon Salmo salar L. from the River Dee, Wales, UK (n = 30); (B) the S. salar control from the River Lærdalselva, Norway (n = 10); (C) brown trout Salmo trutta L. from the River Tyne, England, UK (n = 30); and (D) grayling Thymallus thymallus (L.) from the River Nidd, England, UK (n = 30). The growth on the two S. salar populations, and on S. trutta and T. thymallus is shown on the same scale for direct comparison.