Abstract
A study was undertaken on genetic variation in resistance to infection by Ichthyophthirius multifiliis in two goodeid (Ameca splendens and Ilyodon xantusi) and two poeciliid species (Xiphophorus maculatus and Xiphophorus variatus), and among four strains of X. maculatus (red, red wagtail, yellow comet tail, blue). Analysis of infection data was performed with a generalized linear interactive modelling package (GLIM). Partitioning of the variation was such that the minimal variation attributable to each of several factors was computed. Size of fish, parasite isolate, temperature/tank effects, and various interactions all affect infection levels. Removal of these effects allowed the identification of highly significant differences in both inter‐ and intraspecific variation in resistance. Three distinct groups of fish were identified in terms of their resistance. Species recently derived from wild populations (the two goodeids) were more susceptible than the two poeciliid species which have a much longer history of domestication. The blue strain of X. maculatus had significantly higher resistance than the other three strains.
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