Studies on the life-cycle of Asymphylodora tincae Modeer, 1790) Trematoda: Monorchiidae) in a small lake near Amsterdam: Part 2: The relations between Asymphylodora tincae and its definitive host, Tinca tinca

Abstract

The natural infection of tench by Asymphylodora tincae in a lake was studied during one summer season. The incidence of infection was 57%, the mean intensity about 50. The distribution of the digencans along the host's intestine showed a maximum in the second half; this could be modified by the presence of other helminth species. Tench caught in early spring and kept in the laboratory retained their natural infection throughout the summer. Starvation of hosts during two months caused disappearance of the infection. Experiments showed that metaecrcariae, introduced into the intestine of tench, can excyst within one hour. In vitro, cysts in contact with tench bile opened within 15 seconds. Bile of several other cyprinid fisli species caused excystment within 60 seconds. Asymphylodora eggs appeared in tench faeces 7 to 10 days after infection. Progenetic specimens of A. tincae probably disintegrate in the intestine of the tench and their eggs arc passed out with the faeces.

Diversity of European lissorchiid trematodes from fish and snail hosts with comments on the validity of the genusParasymphylodoraSzidat, 1943

“…The development of A. tincae was elucidated experimentally by Našincová & Scholz (1994) and it has been shown that the definitive host, the tench, T. tinca , became directly infected after the ingestion of pulmonate snails harbouring rediae with mature cercariae. However, Zietse et al (1981) infected tench, T. tinca , with metacercariae designated as A. tincae , but they used larval stages from the snail B. tentaculata . Van den Broek & de Jong (1979) in their study also argue that B. tentaculata acts as first intermediate host of A. tincae and encysted as well as free progenetic metacercariae can be found within one snail.…”

Larval migration in PERL chambers as an in vitro model for percutaneous infection stimulates feeding in the canine hookworm Ancylostoma caninum

“…The iL3 of A. caninum follow the "ambushing strategy", meaning that the larvae wait for their host to come across and then actively attach to the skin [8]. To find a possible host, A. caninum iL3 respond to host-like stimuli, such as warmth, CO 2 , and soluble skin extracts, with directed movement [9-11]. Once attached to an appropriate host, larvae exsheath and penetrate into the host's skin.…”

A review of the diseases and contaminant related mortalities of tench (Tinca tinca L.)

“…Moravec (1985) also described an occurrence of this trematode in tench from Macha Lake. Zietse et al (1981) mentioned 57% incidence of A. tincae infection in tench from a small lake near Amsterdam during summer. Moravec (1985) reported the occurrence of the digenetic trematode Phyllodistomum elongatum in the urinary system (ureters and urinary bladder) of tench from Macha Lake although no details of the pathogenicity were stated.…”