The relationships between metal concentrations in the intestines of infected fish and parasite infrapopulation size in its intestines. (A) Cd concentrations in fish intestines vs. G. volubilis infrapopulation size; (B) Pb concentrations in fish intestines vs. G. volubilis infrapopulation size; (C) Cd concentrations in fish intestines vs. P. elatensis infrapopulation size; (D) Pb concentrations in fish intestines vs. P. elatensis infrapopulation size; (E) Cd concentrations in fish intestines vs. S. rubrimaris infrapopulation size; and (F) Pb concentrations in fish intestines vs. S. rubrimaris infrapopulation size.