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New data on the morphology and occurrence of a parasite of Antarctic fishes, Derogenes johnstoni Prudhoe et Bray, 1973 [Digenea, Hemiuroidea]

100%

Zdzitowiecki K., Pisano E., Vacchi M.

Acta Parasitologica

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1993

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tom 38

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nr 2

Derogenes johnstoni Prudhoe et Bray, 1973 is redescribed based on newly collected specimens from notothenioid fishes from the Ross Sea. The species is distinguished from D. varicus (Müller, 1784) by larger eggs, 0.061-0.079 x 0.039-0.051 mm, with very thick shell, 0.005-0.007 mm wide, and a small knob at the anopercular pole. D. johnstoni seems to be common in Terra Nova Bay and probably in all subcontinental waters of the East Antarctic, while D. various (a cosmopolitan species) occurs commonly in the subantarctic and rarely at the South Shetland Islands.

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Digenea of fishes of the Weddell Sea. VI. The superfamily Hemiuroidea

67%

Zdzitowiecki K.

Acta Parasitologica

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1997

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tom 42

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nr 4

In total, 404 fishes of 34 species were examined and 678 digenean specimens found. Apart from data on Macrourus whitsoni previously published, 40 specimens of teleost fishes belonging to 14 species and six families were infected with Hemiuroidea; 91 specimens belonging to seven species and four families were collected. Metacercariae of Otodistomum cestoides (Beneden, 1871) (family Azygiidae) occurred in cysts on the mesentery. The remaining species, Genolinea bowersi (Leiper et Atkinson, 1914) and Aphanurus sp. (Bunocotylidae); Derogenes johnstoni Prudhoe et Bray, 1973 and Gonocerca phycidis Manter, 1925 (Derogenidae); Elytrophalloides oatesi (Leiper et Atkinson, 1914) and Glomericirrus macrouri (Gaevskaya, 1975) (Hemiuridae), occurred as adults in the alimentary tract. A single specimen of Aphanurus sp. probably belongs to a new species, but is a little distorted and lacks eggs. The other species were found in 17 new hosts. O. cestoides, G. bowersi and D. johnstoni were found in the Weddell Sea for the first time. G. macrouri occurred mainly in fishes living in deep waters (below 300 m), whereas E. oatesi (rare in the investigated area) mainly in shallower waters.

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

67%

Zdzitowiecki K.

Acta Parasitologica

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2002

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tom 47

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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.

Ograniczanie wyników

3 Acta Parasitologica

3 Zdzitowiecki K.

1 Pisano E.

1 Vacchi M.

1 2002

1 1997

1 1993

New data on the morphology and occurrence of a parasite of Antarctic fishes, Derogenes johnstoni Prudhoe et Bray, 1973 [Digenea, Hemiuroidea]

Digenea of fishes of the Weddell Sea. VI. The superfamily Hemiuroidea

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