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1

The tetraphyllidean and tetrabothriid cercoids from Antarctic bony fishes. II. Occurrence of cercoids in various fish species

100%
Wojciechowska A.
Acta Parasitologica
|
1993
|
tom 38
|
nr 3
The occurrence of eight tetraphyllidean and tetrabothriid cercoids in the alimentary tract of 43 bony fish species (in both adult and larval stages) from three localities, at the South Shetland Islands, South Georgia and the Antarctic convergence line, is reported. Three forms of cercoids with monolocular bothridia (probably Phyllobothrium spp.), as well as a cercoid with undivided bothridia with hook-like projections (probably Dinobothrium sp.), are associated with the pelagic environment. Two forms of cercoids with bilocular bothridia (probably, mainly Pseudanthobothrium spp.), and one form with trilocular bothridia (probably Oncobothrium antarcticum Wojciechowska, 1990), are associated with the benthic zone of fiords and the open sea shelf. Massive infections of predatory fishes with these cercoids were found especially strong in cases of Parachaenichthys spp. (up to 16 thousand cercoids in one host specimen). Cercoids lacking bothridia (probably larval Tetrabothriidae) were found exclusively in a South Georgian fiord. This form is the only one occurring in fish larvae.
2

The tetraphyllidean and tetrabothriid cercoids from Antarctic bony fishes. III. Infection of Notothenia neglecta and N.rossii in Admiralty Bay

72%
Wojciechowska A.
Acta Parasitologica
|
1993
|
tom 38
|
nr 4
Investigations on the relations of the infection of Notothenia neglecta and immature N. rossii from Admiralty Bay with two common tetraphyllidean cercoids (with bi- and trilocular bothridia) to the fishes’ sex, size and seasonality were carried out. The infection of N. neglecta with both forms of cercoids was independent on host’s sex, but dependent on host size. The infection of N. rossii with the same cercoids was also dependent on host size but this relation was strongly marked only in the case of cercoids with trilocular bothridia, while statistically insignificant in the case of cercoids with bilocular bothridia. The level of the infection of N. neglecta with both forms of cercoids dependent weakly from season of the year. The greatest numbers of both cercoids occurred more frequently in the second half of the year (Antarctic winter and spring). The length of time that larvae stay in the alimentary tract of bony fishes is not known, thus the time of the main acquisition of the parasites cannot be determined.
3
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Tetraphyllidean cercoid ultrastructure: Janicki's Cercomer Theory revisited

72%
Jarecka L., Burt M. D. B., MacKinnon B. M.
Wiadomości Parazytologiczne
|
1998
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tom 44
|
nr 3
4

The tetraphyllidean and tetrabothriid cercoids from Antarctic bony fishes. I. Morphology. Identification with adult forms

58%
Wojciechowska A.
Acta Parasitologica
|
1993
|
tom 38
|
nr 1
Cercoid larvae of tapeworms representing the order Tetraphyllidea (7 distinct forms) and the family Tetrabothriidae (1 form) were found in the intestines of Antarctic bony fishes. These forms differ from one other in morphology and geographical distribution. Cercoids with bilocular bothridia lacking accessory suckers (2 forms) probably belong to tapeworms of the genera Pseudanthobothrium and Anthobothrium, those with monolocular bothridia with accessory suckers (3 forms) to the genus Phyllobothrium, while those with trilocular bothridia may belong to the species Oncobothrium antarcticum Wojciechowska, 1990. One form with undivided bothridia with accessory suckers and hook-like projections probably belongs to an unreported species of the genus Dinobothrium. The last form lacking bothridia seems to be a cercoid of the family Tetrabothriidae.
5

The tetraphyllidean cercoids from teleosts occurring in the Weddel Sea [Antarctic]

51%
Rocka A.
Acta Parasitologica
|
1999
|
tom 44
|
nr 2
In total, 400 teleosts of 32 species (7 families) were examined. Cercoids of Tetraphyllidea (about 41 thousands) occurred in 204 host specimens of 26 species. Three morphological forms of cercoids were recognized. They were cercoids with bothridia divided into two and three loculi, and cercoids with subcylindrical bothridia. All forms were found in fishes from the Weddell Sea for the first time. Cercoids with bilocular bothridia were the most abundant form (90.7% of all specimens); cercoids with trilocular bothridia and cercoids with subcylindrical bothridia were less numerous (6.6 and 2.7% of all specimens, respectively). Cercoids concentrated in obligatory or facultative predators, whereas pelagic and bentho-pelagic fishes feeding on crill, were rarely infected. Chionodraco hamatus was the most heavily infected - prevalence 100%, relative density 903.
6

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

51%
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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