标题：Endohelminth parasites of the freshwater fish Zoogoneticus purhepechus (Cyprinodontiformes: Goodeidae) from two springs in the Lower Lerma River, Mexico
摘要：In order to establish the helminthological record of the viviparous fish species Zoogoneticus purhepechus,72 individuals were collected from 2 localities, La Luz spring (n= 45) and Los Negritos spring (n= 27), both in thelower Lerma River, in Michoacán state, Mexico. Twelve helminth taxa were recovered, 5 adults (the digeneansMargotrema bravoae and Phyllodistomum sp., the cestode Bothriocephalus acheilognathi, the nematode Rhabdochonalichtenfelsi and the acanthocephalan Pomphorhynchus cf. bulbocolli), and 7 larvae (the metacercariae of Clinostomumcomplanatum, the cysticercoid of Cyclophyllidea, the nematodes Rhabdochona sp., Eustrongylides sp., Contracaecumsp. and Spiroxys sp., and the cysthacanth of Polymorphus brevis). Of these, R. lichtenfelsi was the most prevalent andabundant species at La Luz spring with 15.6% and 0.33 individuals per analyzed host. The remaining species wererelatively more rare and infrequent. The helminth parasite community of Z. purhepechus at Los Negritos spring wasremarkably poor and abundance was very low. The omnivorous feeding habits, the position of the host species in thefood web, and the environmental characteristics of each locality are suggested as the main factors determining thehelminth parasite communities in this freshwater fish.
