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The examined terrritory permits to distinguish 3 positions: populated, unpopulated, but likely to be populated, and unpopulated but hardly probable to be populated by Galba truncatula. The highest place showing the presence of the snail was at 1325 m. over the sea level.
In total, 60 fish specimens belonging to four families, Zoarcidae (19 specimens of three species), Liparididae (14 specimens of two species), Macrouridae (23 specimens of one species) and Rajidae (four specimens of two species), caught in the Weddell Sea were examined. A zoarcid, Lycodichthys dearborni, and both Rajidae, Bathyraja maccaini and Bathyraja sp., were not infected. Macrourus whitsoni was the most strongly infected (six digenean species found, prevalence 91.3%, mean abundance 10.13). Two zoarcids, Ophthalmolycus amberensis and O. bothriocephalus, were infected with Macvicaria longibursata; the former also with Aphanurus sp., Paraliparis antarcticus and P. trilobodon were infected with Steringophorus liparidis and Neolebouria terranovaensis, and Derogenes johnstoni, respectively. The check list of Digenea recorded in Antarctica in non- notothenioid fishes is given. Infected fishes belong to six families, Zoarcidae (7 digenean species found), Macrouridae (8), Muraenolepididae (9), Liparididae (5), Bathylagidae (one) and Rajidae (one). In total, 29 digenean species were found, of which 12 are common for Notothenioidei and other fishes, whereas 17 species are specific for non-notothenioid definitive hosts. Digenea belong to four higher taxa, Opecoelidae (10 species), Lepocreadiidae (10), Fellodistomidae (one) and Hemiuroidea (8).
Helicometra pisanoae sp. n. (Digenea, Opecoelidae) is described based on adult specimens from a fish, Trematomus hansoni (Nototheniidae) caught at the Adelie Land (Eastern Antarctic). The newly described species belongs to the group of species with the terminal, infundibuliform oral sucker. The other diagnostic features are: the sucker ratio based on mean diameter 1:0.84-1.02, blind intestinal caeca, the genital pore closely anterior to the intestinal bifurcation, the cirrus sac reaching posteriorly to the level of posterior half of the ventral sucker and the vitelline follicles reaching to the level of the ventral sucker.
In total, 400 bony fishes of 32 species (7 families) were examined. Acanthocephalans occurred in 55 host specimens of 15 species. Five species were recognised, including 3 echinorhynchid species maturing in fish, Metacanthocephalus campbelli (Leiper et Atkinson, 1914), M. dalmori Zdzitowiecki, 1983 and Echinorhynchuspetrotschenkoi (Rodjuk, 1984), as well as cystacanths of 2 polymorphid species maturing in seals, Corynosoma bullosum (Linstow, 1892) and C. pseudohamanni Zdzitowiecki, 1984. All species were found in fish in the Weddell Sea for the first time. M. dalmori, E. petrotschenkoi and C. bullosum were not previously recorded in the high Antarctic. Out of 26 host/parasite relationships, 24 are new. The level of infection was very low. Only 114 acanthocephalan specimens were found, with the maximum intensity of 12 cystacanths in one Trematomus pennelli. C. bullosum was the most abundant species (53% of all specimens). Out of 11 fish species examined in numbers of 18-46 specimens, only 6 were infected. Trematomus scotti was the most strongly infected - prevalence 54%, relative density 1.04.
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