Abstract
The analysis of infection dynamics of copepods, which are the intermediate hosts of three helminth species of freshwater fishes (Triaenophorus crassus, Proteocephalus exiguus and P. percae), has shown that diapause in the life cycle of the copepods is favourable for preserving the infection in the waterbody until physiological prerequisites for successful infection of the final host are acquired. The peculiarity of a copepod's life cycle may determine the strategy of a parasite in its preimaginal phase as a waiting stage, and the duration of the residence of helminth larvae in copepods that have an obligatory diapause, is one of the elements the provide stability in parasite systems.
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