Wyniki wyszukiwania - Biblioteka Nauki

1

The surface topography of the tegument and haptor of the monogenean parasite Eudiplozoon nipponicum [Goto, 1891] from the gills of carp [Cyprinus carpio L.]

100%

Hodova I. , Gelnar M. , Kearn G. C.

Wiadomości Parazytologiczne

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1998

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tom 44

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nr 3

2

Dactylogyrus spp. (Monogenea, Dactylogyridae) from the gills of Enteromius spp. (Cypriniformes, Cyprinidae) from the Limpopo Province, South Africa with descriptions of three new species

84%

Raphahlelo M. E. , Prikrylova I. , Matla M. M.

Acta Parasitologica

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2020

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tom 65

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nr 2

3

The nematode parasite, Anguillicola crassus Kuwahara, Niimi et Itagaki, and the monogenean gill parasite, Pseudodactylogyrus anguillae (Yin et Sproston), in eel, Anguilla anguilla (L.), fry

84%

Rolbiecki L. , Bartel R. , Rokicki J.

Archives of Polish Fisheries

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2008

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tom 16

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nr 2

EN

The aim of the study was to determine the prevalence and intensity of infection of European eel, Anguilla anguilla (L.), with nematode and monogenean gill parasites. Fifty individuals obtained from Vistula Lagoon stocking material were examined in August and October 2006. The prevalence of infection with Pseudodactylogyrus anguillae (Yin et Sproston) in August was 52.4%, and in October 17.2%, while the mean intensity of infection in the same periods was 4.0 and 1.2 individuals, respectively. The prevalence of infection with Anguillicola crassus Kuwahara, Niimi et Itagaki was 4.8 (August) and 20.7% (October), while the mean intensity was 1.0 and 2.5 individuals. Releasing parasite-infected stocking material is harmful from the perspective of fisheries management and simultaneously increases the area of occurrence of the parasites.

PL

Celem badań było określenie ekstensywności i intensywności zarażenia węgorza europejskiego, Anguilla anguilla (L.) pasożytniczymi nicieniami i skrzelowcami. W sierpniu i październiku 2006 roku zbadano 50 osobników narybku węgorzy pochodzących z partii materiału do zarybienia Zalewu Wiślanego. Ekstensywność zarażenia Pseudodactylogyrus anguillae w sierpniu wynosiła 52,4%, a w październiku 17,2%, natomiast średnia intensywność w porównywanych okresach wynosiła odpowiednio 4,0 i 1,2 osobn. (tab. 1). Ekstensywność zarażenia Anguillicola crassus wynosiła 4,8 (sierpień) i 20,7% (październik), a średnia intensywność 1,0 oraz 2,5 osobn. Wykorzystywanie zarażonych węgorzy jako materiału zarybieniowego jest szkodliwe z punktu widzenia gospodarki rybackiej oraz powiększania areału występowania pasożytów.

4

Monogenean parasites from fishes of the Vaal Dam, Gauteng Province, South Africa. I. Winter survey versus summer survey comparison from Labeo capensis (Smith, 1841) and Labeo umbratus (Smith, 1841) hosts

84%

Crafford D. , Luus-Powell W. , Avenant-Oldewage A.

Acta Parasitologica

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2014

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tom 59

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nr 1

EN

Indigenous South African Labeo spp. show promise with regard to development of semi-intensive aquaculture, yet little research on their monogenean fauna has been conducted. Ecological aspects of monogenean fauna of the moggel Labeo umbratus (Smith 1841) and the Orange River mudfish Labeo capensis (Smith 1841), as recorded during both winter and summer sampling surveys, are reported here. Fish were collected using gill nets, euthanized and gills removed and examined to both quantify parasite numbers and distribution on the gills. Results obtained support the hypothesis that gill site preference is not due to active choice for a particular attachment site, but rather a result of water flow over gills during respiration in conjunction with fish behaviour and habitat use. Interaction between individual elements investigated (temperature effects, parasite population dynamics and host population dynamics) may be largely responsible for seasonal differences in infection statistics of monogenean parasites. Such interactions should be investigated in future large scale ecological studies, in combination with experimental studies, to further elucidate these effects.

5

Onchocleidus principalis (Monogenea: Ancyrocephalidae) co-introduced to Europe with centrarchid fish

84%

Ondrackova M. , Pravdova M. , Seifertova M. , Prikrylova I. , Kvach Y. , Ribeiro F.

Acta Parasitologica

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2020

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tom 65

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nr 4

6

Sperm transfer in monogenean (platyhelminth) parasites

84%

Kearn G. , Whittington I.

Acta Parasitologica

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2015

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tom 60

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nr 4

7

Molecular characterization and phylogeny of some mazocraeidean monogeneans from carangid fish

84%

Tambireddy N. , Gayatri T. , Gireesh-Babu P. , Pavan-Kumar A.

Acta Parasitologica

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2016

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tom 61

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nr 2

8

Three monogeneans parasitic on marine sciaenid fish from Peru including description of Cynoscionicola veranoi n. sp. (Microcotylidae), and redescription of C. americanus Tantalean, Martinez and Escalante, 1987 and Hargicotyle sciaenae Oliva and Luque, 1989 (Diclidophoridae)

84%

Chero J. D. , Cruces C. L. , Saez G. , Luque J. L.

Acta Parasitologica

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2017

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tom 62

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nr 3

9

Comparative ultrastructure of fertilization in parasitic platyhelminthes

84%

Swiderski Z. , Conn D. B.

Wiadomości Parazytologiczne

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1998

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tom 44

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nr 3

10

A study of egg assembly in the monogenean [platyhelminth] fish skin parasite, Entobdella soleae, using a fast preservation technique and transmission electron microscopy

84%

Tappenden T. , Kearn G.

Wiadomości Parazytologiczne

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1998

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tom 44

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nr 3

11

Four new species of Synodontella Dossou et Euzet, 1993 (Monogenea: Dactylogyridae) gills parasites of Synodontis clarias from the Bagoue River (North-Western Ivory Coast)

67%

Bouah E. F. , N'Douba V.

Acta Parasitologica

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2020

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tom 65

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nr 4

12

Monogenean parasites from fishes of the Vaal Dam, Gauteng Province, South Africa II. New locality records

67%

Crafford D. , Luus-Powell W. , Avenant-Oldewage A.

Acta Parasitologica

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2014

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tom 59

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nr 3

EN

Baseline information on parasitic infections, including monogenean infections on wild fishes, may aid in implementation of proactive measures as opposed to reactive research aimed at crisis control with reference to future aquaculture applications. The aim of this project was to examine the freshwater monogenean fauna of the Vaal Dam, Vaal River system, South Africa. This short communication reports on infection statistics for monogenean species, some representing new locality records. Parasites were collected from host species other than Labeo spp. from the Vaal Dam, during a summer (January 2010) survey. Fish collected using gill nets of varying mesh sizes were weighed and measured. Mucous smears were prepared from the skin and fins with the aid of microscope slides. Fish were killed humanely by severing the spinal cord behind the head. Gills were carefully removed and divided into areas which were separately scraped to investigate potential parasite site preference. The areas examined were dorsal, median and ventral positions on both the anterior and posterior hemibranch. Both mucous smears and gill scrapings were examined with the aid of a stereo microscope. More parasites were collected from the first or second gill arches, the medial position on the gill, and the anterior hemibranch. Preference for either left or right gill set was inconclusive. Spatial distribution of parasites is thought to result from water flow over the gills during respiration. This paper reports a new locality record for the following monogenean species: Quadriacanthus aegypticus, Dactylogyrus extensus, Dactylogyrus minitus, Gyrodactylus kherulensis and Dactylogyrus lamellatus.

13

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

67%

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

EN

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.

14

An experimental study of egg assembly in the monogenean [platyhelminth] skin parasite Entobdella soleae, using a fast preservation technique and transmission electron microscopy

67%

Tappenden T. , Kearn G. C.

Acta Parasitologica

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1999

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tom 44

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nr 1

EN

Stages in the assembly of the egg in the monogenean skin parasite Entobdella soleae have been studied using a fast preservation technique for transmission electron microscopy. The first event is the release by the germarium of a fertilised oocyte, which travels to the ootype followed by many vitelline cells. There are two types of Mehlis' gland and the secretion from one of these (beta) is thought to promote the release of the vitelline droplets, which fuse peripherally in the distal tetrahedral chamber of the ootype to produce the eggshell. Initially, the zygote lodges in the distal corner of the chamber, perhaps held in place by cortical granule material, and prevents shell deposition in this corner. However, this is temporary, and when the zygote leaves the corner the opercular eggshell is laid down. The egg appendage is assembled in the proximal tubular part of the ootype and the adhesive droplets on the appendage are derived from the second (alpha) type of Mehlis' secretion.

15

Swimming in Gyrodactylus rysavyi [Monogenea, Gyrodactylidae] from the Nile catfish, Clarias gariepinus

67%

El-Naggar M. M. , El-Naggar A. A. , Kearn G. C.

Acta Parasitologica

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2004

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tom 49

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nr 2

EN

Gyrodactylus rysavyi, a monogenean parasite of the skin, fins and gills of the Nile catfish, Ciarias gariepinus, is capable of directional swimming when detached from the host and released in open water. The parasite propels itself by vigorously bending the body into a loop and then unbending the body with equal vigour. A typical Swimming phase lasts for 2-6 sec, involves between 4 and 8 looping/unlooping actions per sec and propels the parasite in any direction, including vertically upwards or downwards, at speeds of 1.7-5 mm/sec. The parasite is capable of swimming upwards for a distance of at least 15 cm. At the end of each swimming phase, the parasite sinks slowly, performing while it does so twisting and turning movements. The duration of this resting phase is similar to that of the swimming phase. A unique feature of the haptor of G. rysavyi is a posterior shift in the position of the 16 hooklets relative to the two large hamuli. The long handles of the hooklets radiate outwards, and like ribs support the fan-shaped posterior region of the haptor. This arrangement may be a specialization related to the adoption of looping and unlooping swimming movements, since the hooklet-supported fan is likely to provide most of the propulsion during swimming. Consideration is given to the possible role of swimming and the twisting and turning behaviour of the passively sinking parasite in the dispersal and transmission of G. rysavyi. The gyrodactylids Macrogyrodactylus congolensis and M. clarii, which also parasitize C. gariepinus, do not swim when detached from the substrate.

16

The first record of Macrogyrodactylus species [Monogenea, Gyrodactylidae] on freshwater fishes in Senegal with the description of Macrogyrodactylus simentiensis sp.nov., a parasite of Polypterus senegalus Cuvier

67%

Prikrylova I. , Gelnar M.

Acta Parasitologica

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2008

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tom 53

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nr 1

EN

The first record of monogenean parasites of the genus Macrogyrodactylus Malmberg, 1957 on freshwater fish in Senegal is presented. Macrogyrodactylus congolensis Prudhoe, 1957 from the skin and Macrogyrodactylus heterobranchii N’Douba et Lambert, 1999 from the gills of Clarias anguillaris L. were found, representing new host records for these parasites. On Polypterus senegalus Cuvier, three Macrogyrodactylus species were identified, Macrogyrodactylus polypteri Malmberg, 1957, Macrogyrodactylus simentiensis sp. nov. and Macrogyrodactylus sp. M. simentiensis sp. nov. can be readily distinguished from the other Macrogyrodactylus species by the size of its hamuli and the shape of its marginal hook sickles. The marginal hooks on the anterolateral lobes of M. simentiensis differ in size and shape from those on the posterior margin of the haptor. Measurements and drawings of the haptoral sclerites of all five identified species are provided.

17

Two new species of entobdelline skin parasites [Monogenea, Capsalidae] from the blotched fantail ray, Taeniura meyeni, in the Pacific Ocean, with comments on spermatophores and the male copulatory apparatus

59%

Whittington I. D. , Kearn G. C.

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tom 54

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nr 1

12-21

EN

We made a comparative anatomical study of entobdelline monogenean skin parasites from the blotched fantail ray, Taeniura meyeni (= T. melanospila) from public aquaria and fish-holding facilities distributed widely across the western Pacific Ocean. These facilities were located in Australia (Mooloolaba, southern Queensland; Cairns, northern Queensland), Taiwan and Japan. The capture localities of the aquarium fishes are unknown to us, with the exception of the individual fish from northern Queensland which came from Sudbury Reef, a local inshore reef. Entobdellines from southern Queensland differed morphologically from those from northern Queensland and Taiwan and the 2 new monogenean species are described and named Neoentobdella garneri sp. nov. and N. taiwanensis sp. nov., respectively. We determined that an entobdelline collected by Dyer and co-workers from a ray identified as T. melanospila (= T. meyeni) from an aquarium in Okinawa, Japan and identified by them as Entobdella squamula (Heath, 1902) Johnston, 1929 was misidentified and is tentatively assigned to N. taiwanensis sp. nov. The male copulatory organ of each new species resembles a penis, but evidence that these organs are eversible like a cirrus is presented. Caution is advised in deciding whether the male copulatory organs of capsalids may function as a penis or as a cirrus and we suggest that possession of a penis versus a cirrus may not necessarily indicate wide evolutionary divergence. In N. garneri, spermatophores consist of a sausage-shaped capsule and a long hollow stalk. A spermatophore received from a donor is anchored in the vagina by means of the stalk, with the capsule protruding outside the body.

18

An ultrastructural study of the egg assembly region of the female reproductive tract of the monogenean [platyhelminth] skin parasites Entobdella soleae and E.hippoglossi

59%

Tappenden T. , Kearn G. C.

Acta Parasitologica

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1999

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tom 44

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nr 1

EN

An ultrastructural study has been made of the egg assembly apparatus of the monopisthocotylean monogenean skin parasites Entobdella soleae and E. hippoglossi from the common sole, Solea solea, and the halibut, Hippoglossus hippoglossus, respectively. The ootype consists of a distal tetrahedral chamber where the egg capsule is assembled and a proximal ootype tube where the egg appendage is made. Two types of Mehlis' gland (alpha and beta) open at the proximal end of the ootype tube, which has a non-secretory lining. In both species, the tetrahedral ootype chamber has a syncytial lining, which apparently is not secretory and possesses on its luminal surface stud-like projections, each with vacuolated cytoplasm and an electron-dense core. The ootype chamber is enclosed by a single layer of muscle fibres and is embedded in a spongy "connective tissue". The uterus in E. soleae has a cellular secretory lining, with densely packed luminal microvilli.

19

A new genus and new species of microbothriid monogenean [Platyhelminthes] with a functionally enigmatic reproductive system, parasitic on the skin and mouth lining of the largetooth sawfish, Pristis microdon, in Australia

51%

Kearn G. C. , Whittington I. D. , Evans-Gowing R.

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tom 55

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nr 2

115-122

EN

Dermopristis paradoxus gen. et sp. nov., a microbothriid monogenean parasite from the skin and mouth lining of the largetooth sawfish, Pristis microdon (Elasmobranchii, Pristidae) in Australia, is described. The parasite has 2 juxtaposed testes and differs from other microbothriids in possessing a unique and unusual terminal male reproductive tract comprising a proximal and a distal tube, the latter with a conspicuous opening on the ventral surface and lacking a recognisable male copulatory organ. The smalltooth sawfish, P. pectinata, also has a skin-parasitic microbothriid, Dermophthirioides pristidis Cheung et Nigrelli, 1983, but this parasite species has a prominent copulatory papilla. Dermopristis paradoxus also has parallel ridges with broad tops running in a roughly transverse direction across the ventral surface of the body. The ventral ridges are prominent from the level of the pharynx to the posterior region of the body. The function of the ridges is unknown. Reproductive biology, attachment and feeding in D. paradoxus are discussed. In the absence of unmounted parasite specimens for sectioning, a mounted specimen of D. paradoxus was released from the slide and successfully processed to provide serial, stained, resin sections. This useful technique is recommended to provide anatomical information in situations where only specimens on slides are available for study.

20

Pseudodactylogyrosis in Anguilla anguilla (Actinopterygii: Anguilliformes: Anguillidae): change of control strategies due to occurrence of anthelmintic resistance

51%

Buchmann K. , Kania P. W. , Neumann L. , De'Besi G.

Acta Ichthyologica et Piscatoria

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2011

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tom 41

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nr 2

EN

Background. The European eel, Anguilla anguilla (L.), is considered an endangered species and a series of protective measures have been implemented within the European community in order to enhance natural stocks. Restocking natural habitats with larger eels reared from the glass-eel stage in recirculated farming systems may be one solution. Gill diseases caused by monogenean parasites of the genus Pseudodactylogyrus are currently causing morbidity and mortality in these farms and previously applied standard treatments have recently failed. Therefore the applied control methods should be verified and novel solutions proposed. Materials and methods. Eels infected by Pseudodactylogyrus anguillae were obtained from a typical recirculated eel-culture system which had been treated regularly but recently unsuccessfully with benzimidazole anthelmintics. In the laboratory infected eels were subjected to bath treatments with flubendazole (5 or 10 mg · L–1) or praziquantel (5 or 10 mg · L–1) for 24 h at 25ºC and parasite infections were recorded three days post-treatment. Results. Gill monogeneans, Pseudodactylogyrus anguillae, were not controlled by the anthelmintic flubendazole at any of the dosages tested whereas praziquantel showed a significant effect when used as bath (5 and 10 mg · L–1). Conclusion. The failure of flubendazole for control of pseudodactylogyrosis may result from selection of anthelmintic resistant parasite strains due to use of benzimidazoles for decades. Future treatment regimes during acute outbreaks may be based on praziquantel. A risk for future continued selection for anthelmintic resistance exists and supplementary non-chemical methods (mechanical and biological) in rearing of European eel should be emphasized in the future management practice of eel.