infection levels of plerocercoids of the tapeworm triaenophorus crassus and feeding strategy in two fish species from the ultra-oligotrophic lake achensee, austria.thus far, high burdens of triaenophorus crassus plerocercoids have been reported only in old age groups of coregonid and salmonid fishes. here we show heavy infection with t. crassus in young whitefish coregonus lavaretus in the ultra-oligotrophic and regulated achensee in tyrol, austria. prevalence of t. crassus on c. lavaretus was 100% in all age groups and abundance significantly increased with fish age. the mean annual accumulation of t. crassus was 5.2 parasites in 0- to 7-year-old c. lavar ...201625345803
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