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1

Occurrence of Digenea in fishes of the family Channichthyidae in the Weddell Sea and other sub-continental areas of the Antarctica

100%
Zdzitowiecki K.
Acta Parasitologica
|
2002
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tom 47
|
nr 2
As a result of the examination in the Weddell Sea of 59 channichthyid fishes belonging to six species, only three fish specimens of two species, Chionodraco hamatus (one of 20) and Cryodraco antarcticus (two of seven), were found to be infected with Digenea. Three digenean species, Macvicaria georgiana, Derogenes johnstoni and Glomericirrus macrouri, were recognized. The infection was extremely low - one or two parasites in each infected fish. All these digenean species are more abundant in the Weddell Sea in other fishes. Results were compared with literature data for three other Antarctic areas, the environs of Adelie Land, the South Shetland Islands and the Ross Sea (off Terra Nova Bay). Channichthyidae are much more highly infected in these areas and with higher diversity of parasites - in total 12 species. The low infection of channichthyids in the Weddell Sea is probably associated with the presence of shelf glaciers (instead of a sub-coastal environment) and the feeding of these fishes mainly on pelagic organisms. No one digenean species is specific for Channichthyidae, but in areas others than the Weddell Sea Channichthyidae are important hosts of eight digenean species.
2

Digenea of fishes of the Weddell Sea. II. The genus Macvicaria [Opecoelidae]

88%
Zdzitowiecki K., Cielecka D.
Acta Parasitologica
|
1997
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tom 42
|
nr 2
In total, 400 bony fishes caught at a depth 120-1540 m in the east part of the Weddell Sea were examined and 63 fishes of 4 families occurring at depths of 120-590 m were infected with Macvicaria spp. Three species (185 specimens) were recognised, including two new species, M. microtestis sp. n. and M. longibursata sp. n., and one species, M. georgiana (Kovalyova et Gaevskaya, 1974), previously recorded only in the Western Antarctic. M. microtestis sp. n. occurs in nototheniids (Trematomus spp.) and artedidraconids. It has testes smaller than the ovary and which are entirely obscured by vitelline follicles dorsally. M. longibursata sp. n. occurs in two zoarcid species. It has the cirrus sac extending far posterior to the ventral sucker. M. georgiana occurs in eight species of the genus Trematomus (Nototheniidae) and in Cryodraco antarcticus (Channichthyidae); six host species are new. A key to seven species of the genus Macvicaria occurring in the Antarctic is presented.
3

Endoparasitic worms of Harpagifer antarcticus Nybelin, 1947 off the South Shetland Islands [Antarctic]

88%
Zdzitowiecki K., Zadrozny T.
Acta Parasitologica
|
1999
|
tom 44
|
nr 2
Fifty specimens of Harpagifer antarcticus Nybelin, 1947 caught off King George Island in Admiralty Bay (44) and off Elephant Island (6), were examined for endoparasitic worms. Fifteen or sixteen species and larval forms were found, including three species of Digenea (Macvicaria georgiana, Genolinea bowersi and Gonocerca phycidis), four forms of larval Cestoda (three tetraphyllidean cercoids and diphyllobothriid plerocercoid), five species of Acanthocephala (Aspersentis megarhynchus, Metacanthocephalus dalmori, Corynosoma arctocephali cystacanth, C. hamanni cystacanth and C. pseudohamanni cystacanth) and three or four species of Nematoda, Ascarophis nototheniae, Pseudoterranova decipiens third stage larva (L3) and Contracaecum sp. L3 = ?C. osculatum and ?C. radiatum. Only some of the specimens of the two digenean species, M. georgiana and G. bowersi, were fully mature (containing eggs). No one form is specific for Harpagifer, eight have not previously been reported from H. antarcticus. The total prevalence of infection was 68% with a maximum intensity 19 worms. The most numerous parasite in Admiralty Bay was G. bowersi (67 specimens) occurring with a prevalence of 23%; A. megarhynchus was less numerous (19 specimens), but occurred with a higher prevalence, 25%. A list of internal parasitic worms of H. antarcticus (according to present and literature data, probably 17 forms) is compared with that of Notothenia coriiceps occurring in the similar (partly the same) environment at King George Island (27 forms); this is 63% of forms recorded in H. antarcticus. All parasites of H. antarcticus occur in N. coriiceps. A list of parasitic worms recorded in three harpagiferid species is given. The role of harpagiferids as intermediate or paratenic hosts of parasitic worms appears to be more important than a role as definitive hosts.
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