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1

Ultrastructure of the digestive system and experimental study of feeding in the monogenean skin and fin parasite Macrogyrodactylus congolensis

100%
Arafa S. Z., El-Naggar M. M., Kearn G. C.
Acta Parasitologica
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2013
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tom 58
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nr 4
In the present study, transmission electron microscopy (TEM) has been used to study the ultrastructure of the digestive system, namely the pharynx, oesophageal glands and intestine, of the monogenean skin and fin parasite Macrogyrodactylus congolensis. The pharynx consists of an anterior highly muscular region and a posterior mainly glandular syncytial region. The anterior region is provided with six pharyngeal papillae, the centre of each of which is occupied by electron dense secretory bodies, identical with those in the posterior region of the pharynx. The intestine has an uninterrupted syncytial gastrodermis and the luminal surface is provided with many unbranched lamellae. The intestine of living specimens contains large and small granules which give it a reddish brown colour. Large particles, presumed to be lipid droplets, and small granules, presumed to be melanin granules, were found in the gastrodermis and in the intestinal lumen. Parasites were induced to feed and then preserved for TEM at the following intervals: just after feeding, 30 min after feeding, 1 h 30 min after feeding and 2 h after feeding. The specimens were then processed for TEM and sections cut through the intestine of each specimen were examined with the transmission electron microscope. Three types of vacuoles (V1, V2, V3) were detected in the gastrodermis. Vacuoles V1 have thick walls and are likely to be endocytotic, enclosing luminal contents at the surface of the gastrodermis. V2 vacuoles may be lysosomes that fuse with V1 vacuoles. V3 vacuoles may serve to dispose of residual digestive material into the lumen.
2
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The biology and ecology of viviparous monogeneans of the genus Gyrodactylus Nordmann, 1832 in the light of recent knowledge

100%
Matejusova I., Gelnar M.
Wiadomości Parazytologiczne
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1998
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tom 44
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nr 3
3

Ultrastructure of musculature of the marginal hookletsof Macrogyrodactylus congolensis, a monogenean skin parasite from the catfish Clarias gariepinus

80%
Arafa S. Z.
Acta Parasitologica
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2011
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tom 56
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nr 2
The musculature of the marginal hooklets of adult Macrogyrodactylus congolensis (Prudhoe, 1957) Yamaguti, 1963 has been studied. Each marginal hooklet of M. congolensis is associated with three pairs of muscles. The possible role of these muscles in the operation of the marginal hooklet is discussed. Transmission electron microscopy has been used for the first time to study the marginal hooklets of M. congolensis. The handle articulates with the blade in the region of the guard. Internally, the handle, the proximal region of the blade in the articulation region and the distal pointed region of the blade consist of three layers. Distal to the articulation region, the blade consists of four layers with differing electron densities. A cavity is associated with the distal region of the blade and the handle. A cyton containing secretory bodies of different sizes and shapes was found in association with each marginal hooklet. The possible function of these secretions is discussed.
4

Myxobolus molnari sp. n. and M. mokhayeri sp.n. [Myxosporea, Myxozoa] infecting a Mesopotamian fish, Capoeta trutta Heckel, 1843

80%
Baska F., Masoumian M.
Acta Protozoologica
|
1996
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tom 35
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nr 2
5

Lipoxygenase activity of selected tissues and organs of Baltic herring

80%
Stodolnik L., Samson E.
Acta Ichthyologica et Piscatoria
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2000
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tom 30
|
nr 2
Activity of lipoxygenase of the muscle tissue, skin, gills, fins, and gonads of Baltic herring (Clupea harengus L.) was analysed. Effect of gonad maturity (the fishing season) on the activity of this enzyme present in the muscle tissue was demonstrated. The substrate specificity of the enzyme was also determined.
6

Gyrodactylus species [Monogenea] infecting alpine bullhead [Cottus poecilopus Heckel, 1837] in Norway and Slovakia, including the description of Gyrodactylus mariannae sp.nov.

80%
Winger A. C., Hansen H., Bachmann L., Bakke T. A.
Acta Parasitologica
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2008
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tom 53
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nr 3
Gyrodactylus specimens infecting the skin and fins of two alpine bullhead (Cottus poecilopus) populations from the rivers Signaldalselva (North Norway) and Rena (South-East Norway) were characterized by both morphological and molecular means. Morphometrical differences were minor and the nucleotide sequences of the internal transcribed spacers (ITS) of the nuclear rDNA cluster were identical for parasites from both localities. Based on earlier descriptions, the relatively closest species are Gyrodactylus hrabei Ergens, 1957, described from common bullhead (Cottus gobio) in Slovakia and G. sp. Malmberg, 1973, from alpine bullhead in Sweden. The Norwegian Gyrodactylus specimens from the two alpine bullhead populations were morphometrically different from both the type material of G. hrabei from Slovakia and newly collected Gyrodactylus specimens from alpine bullhead in two Slovakian localities. The Slovakian Gyrodactylus specimens were found to be identical with type material of G. hrabei. The nucleotide sequences of the ITS of the Norwegian Gyrodactylus species were different from the Slovakian material. Hence, the Norwegian Gyrodactylus specimens from the alpine bullhead represent a new species, G. mariannae sp. nov.
7

Scanning electron microscope observations on the monogenean skin parasite Macrogyrodactylus congolensis [Prudhoe, 1957] Yamaguti, 1963

80%
Arafa S. Z., El-Naggar M. M., Kearn G. C.
Acta Parasitologica
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2003
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tom 48
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nr 3
The anterior adhesive areas and haptor of the viviparous monogenean skin parasite Macrogyrodactylus congolensis were studied using scanning electron microscopy (SEM). The worm has two head lobes, each provided with a single, ventrally located adhesive area. This adhesive area has few adhesive papillae. The tegument covering the adhesive papillae is microvillous and penetrated by many small and a few large gland duct openings. There is a single spike-like and a dome-shaped sense organ associated with each adhesive area. The possible functions of the microvilli and sensory structures and the role they might play in the temporary attachment of the adhesive areas are discussed. The haptor is cup-shaped and possesses an anterior and two lateral rows of papillae, the possible function of which was also discussed. There is good evidence to suggest a suctorial mechanism for the haptor during its attachment to the host skin and fins. The hamuli may insert into the host tissue while the marginal hooklets were found to play a relatively small part in attachment.
8

First records of trichodinid ectoparasites [Ciliophora: Peritrichia] from introduced freshwater fishes in Tasmania, Australia, with comments on pathogenicity

61%
Basson L.
Acta Protozoologica
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2010
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tom 49
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nr 3
253-265
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