Supplementary Material

Tab. S1. p-values of pairwise contrasts post-hoc test for performed repeated Measures generalized Linear Model (log, Poisson) of the total number of juveniles collected in each control (aggregated for both species); DPI – days post infestation of fish.

Tab. S2. Results of pairwise contrasts post-hoc test for performed repeated Measures generalized Linear Model (log, Poisson) of the differences in number of juveniles collected in given control between both host species (P. phoxinus and C. microstomus); DPI – days post infestation of fish.

Tab. S3. Estimates of evolutionary divergence between COI sequences of U. crassus complex; references: A - Kilikowska et al. 2020, B - Lopes-Lima et al. 2021, C - Lopes-Lima et al. 2024; the referenced citations are included in the main text of the manuscript, in the “References” section.

Tab. S4. Reference to cited literature on host suitability for larvae of U. crassus complex (comparisons between C. gobio and P. phoxinus); A – results obtained from artificial infestation, N – results obtained from natural infestation; DPI – days post infestation; *- only data from a trial performed concurrently with C. gobio were considered in the table; where possible, data from the present study were presented in the same format as in the cited studies for comparison; the referenced citations are included in the main text of the manuscript, in the “Literature” section.

© J.A. Dołęga et al., Published by EDP Sciences, 2026