Threespine stickleback fish with parasites (IMAGE)
Caption
A susceptible threespine stickleback fish is shown alongside three tapeworms from its abdominal cavity. Resistant fish are able to kill tapeworms or limit their growth with scar-tissue like fibrosis. Threespine stickleback have become a model for studying evolution as their marine ancestors colonized freshwater lakes on Vancouver island ~11,000 years ago.
Credit
Amanda Hund, University of Minnesota.
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Copyright University of Minnesota
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