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The non-native Asian fish tapeworm Bothriocephalus acheilognathi was registered for the first time in 2008–2009 in a threatened Mexican fish Profundulus candalarius. From June 2008 to April 2009 the overall prevalence of the cestode in the fish intestines was around 35% (N = 242 P. candalarius examined). Unstrobilized and inmature cestodes formed the greatest proportion (91.07%) of the parasite population. Neither the prevalence, nor the mean intensity varied significantly with host sex. Smaller fish (10–29 mm) were parasitized more frequently than medium size fish (30–59 mm), prevalence 43.5% vs 27.3%. Although, the cestodes’ monthly prevalence and mean intensity per host varied from 18 to 70 percent and from 2.75 to 9.27 respectively, no significant seasonal difference was found. There was a continuous recruitment of cestodes within the host population, as well as a nearly continuous growth and maturation of the parasites to adults. Most cestodes are lost from the host as development of parasites proceeds, and only 12 of the 437 collected tapeworms reached gravidity. The most important features of the data presented here include the confirmation that B. acheilognathi can reproduce in Mexico.

The invasive tapeworm Bothriocephalus acheilognathi Yamaguti, 1934 in the endangered killifish Profundulus candalarius Hubbs, 1924 in Chiapas, Mexico