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1

Molecular identification larvae of Onchobothrium antarcticum (Cestoda: Tetraphyllidea) from marbled rockcod, Notothenia rossii, in Admiralty Bay (King George Island, Antarctica)

100%
Laskowski Z., Rocka A.
Acta Parasitologica
|
2014
|
tom 59
|
nr 4
Antarctic bony fishes are infected with cestode larvae belonging to the order Tetraphyllidea (parasites as adults in chondrichthyans). Larvae of the Tetraphyllidea differ from each other in the morphology of their scoleces and represent five forms. There are larvae with bothridia subdivided into one, two and three loculi, bothridia sac-like in shape and bothridia undivided with hook-like projections. Only one species of the family Onchobothriidae, Onchobothrium antarcticum, has been described from Antarctica and larvae with trilocular bothridia were assigned to this cestode species. In this study, ten larvae obtained from Notothenia rossii and three adult specimens of Onchobothrium antarcticum isolated from Bathyraja eatonii were examined. A partial sequence of cytochrome c oxidase subunit 1 of three adult specimens and four larvae was identical. The remaining six larval sequences differed from the sequences obtained from adult cestodes. Partial sequences of lsrDNA of all analyzed larvae were identical. These results confirm the taxonomic affiliation of the larvae with trilocular bothridia parasitizing marbled rockcod in Antarctica as Onchobothrium antarcticum.
2

New data on the occurrence of Acanthocephala in some fish in Admiralty Bay (South Shetland Islands)

100%
Zdzitowiecki K., Laskowski Z.
Acta Parasitologica
|
2013
|
tom 58
|
nr 4
New data on the infection with Acanthocephala of 33 fish caught in Admiralty Bay in November 2007 to January 2008 are given. These fish belong to 5 species: Notothenia rossii (22 immature specimens), Lindbergichthys nudifrons (n = 7), Trematomus bernacchii (n = 1), T. newnesi (n = 1) and Harpagifer antarcticus (n = 2). Three species of Echinorhynchida: Aspersentis megarhynchus, Metacanthocephalus dalmori and M. johnstoni and four species of Polymorphida: Corynosoma arctocephali, C. bullosum, C. hamanni and C. pseudohamanni, were found. Prevalence of N. rossii and L. nudifrons was 100%. The mean abundance of infection of N. rossii (125.09) was larger than that of Notothenia coriiceps (82.93). Data of infection of N. rossii in 2007 was almost identical with that in 1979 (mean abundance 118.66). The most abundant in this host were A. megarhynchus, M. johnstoni, C. hamanni and C. pseudohamanni (mean abundances 36.36, 29.77, 13.86 and 44.73, respectively). In total Echinorhynchida were more abundant than Polymorphida in 2007/08 (66.18 versus 58.91). Reverse situation was in 1979 (mean abundance 47.36 for Echinorhynchida and 71.3 for Polymorphida. Only 7 L. nudifrons were examined in 2007/08 and Echinorhynchida were more numerous in this host (mean abundance 26.71) than Polymorphida (10.29). Single specimens of other fish were infected with a few Acanthocephala belonging to species recorded in the same hosts with those found in 1978/79.
3

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

100%
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.
4

Antarctic fishes: the chemical composition of muscle, liver and food of two notothenioids

80%
Kamler E.
Archives of Polish Fisheries
|
2003
|
tom 11
|
nr 2
A combination of low fat (6.1 and 4.8% of dry matter), high protein (78.6 and 84.3% d.m.) and mineral content (6.3 and 6.2% d.m.), as well as high moisture (80.8 and 81.7% of fresh matter), which is typical of Antarctic benthic fish, was found in the muscle of Notothenia coriiceps and Lepidonotothen nudifrons, respectively. Fish food items (whole amphipods) were high in minerals (34.3% d.m.) and poor in protein (39.1% d.m.), while macroalgae presented an association of high moisture (89% of wet matter), high minerals (36.5% d.m.), low lipids (1.8% d.m.) and very low protein (17.5% d.m.). The poor nutritional value of these food items seems to be compensated for by high food intake. Sulfur levels in fish tissues were negatively related to fish size. Sulfur and nitrogen were inter-correlated strongly and positively, and most of the sulfate is probably derived in muscle and liver from sulfur-containing amino acids.
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