| asian fish tapeworm bothriocephalus acheilognathi in the desert southwestern united states. | the asian fish tapeworm bothriocephalus acheilognathi (cestoda: bothriocephalidea) is an introduced fish parasite in the southwestern united states and is often considered a serious threat to native desert fishes. determining the geographic distribution of nonnative fish parasites is important for recovery efforts of native fishes. we examined 1,140 individuals belonging to nine fish species from southwestern u.s. streams and springs between january 2005 and april 2007. the asian fish tapeworm w ... | 2010 | 21413512 |