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  • 1
    Electronic Resource
    Electronic Resource
    Trichodinid Protozoa (Ciliophora: Peritrichida) from Freshwater Fishes of Rybinsk Reservoir, USSR (1984)
    Oxford, UK : Blackwell Publishing Ltd
    The @journal of eukaryotic microbiology 31 (1984), S. 0 
    Details
    ISSN: 1550-7408
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: During the spring of 1981, trichodinid protozoa were collected from the gills or urinary bladder of the following species of fishes of Rybinsk Reservoir, USSR, located on the upper reaches of the Volga River system: Esox lucius, Rutilus rutilus, Leuciscus idus, Blicca bjoerkna, Abramis ballerus, Pelecus cultratus, Lota lota, and Perca fluviatilis. A total of 13 species of Trichodinidae was recovered from Rybinsk fishes, among which are three new species of the genus Trichodina: T. izyumovae n. sp. from the gills of L. idus, T. borokensis n. sp. from the gills of P. cultratus, and T. kupermani n. sp. from the gills of A. ballerus. Other species of trichodinids reported are T. modesta Lom, 1980; T. nigra Lom, 1969; T. pediculus (O. F. Müller, 1786); T. prowazeki Grupcheva & Lom, 1980; T. rostrata Kulemina, 1968; T. urinaria Dogiel, 1940; T. ophiocephalus Kostenko & Karaev, 1976; Paratrichodina incisa (Lom, 1959); Trichodinella epizootica (Raabe, 1950); and Tripartiella copiosa Lom, 1959. Photomicrographs and morphometric data are presented for each species and aspects of their host and geographic distribution discussed. Trichodina algonquinensis Li & Desser, 1983 is considered a synonym of T. urinaria Dogiel, 1940.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1550-7408.1984.tb04294.x
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  • 2
    Electronic Resource
    Electronic Resource
    Dermocystidiosis–a gill disease of the carp due to Dermocystidium cyprini n.sp. (1974)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 6 (1974), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: A new species of Dermocystidium is reported to be the causative agent of three outbreaks of gill disease in carp observed in recent years in Czechoslovakia. No other parasites or influences could be held responsible for the disease. It is suggested that at least some of gill disease of unknown aetiology in carp is due to dermocystidia, and the disease might be distributed in many regions of Europe. A description of a greater part of the developmental cycle of the species D. cyprini n.sp. Červinka et Lom, is presented, supplemented by a discussion of other species of the genus. A summary of known facts on the host-parasite relation in these parasites is also given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1974.tb05112.x
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  • 3
    Electronic Resource
    Electronic Resource
    Histopathological changes in fish gills infected with myxosporidian parasites of the genus Henneguya (1978)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 12 (1978), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Tissue reaction to invasion by two Henneguya species was studied in gills of three species of fish. Henneguya psorospermica and Henneguya creplini develop in secondary lamellar arterioles in perch (perca fluviatilis) and ruff (Acerina cernua). In pike (Esox lucius), H. psorospermica develops in the artery. During the growth of the vegetative stage, the gill tissue may undergo local atrophy or hyperplasia of the epithelium and displacement and disfiguration of the lamellae. After the myxosporidian cyst, surrounded by a host tissue capsule has reached maturity and contains fully-formed spores, an inflammatory reaction may set in which reduces the cyst to granulomatous tissue. This inflammatory process is essentially of the same type as that observed in mammals. There is evidence that inflammatory responses are of regular occurrence in the final stages of most myxosporidian infections. Transfer from low to room temperature provokes a rapid elimination of the cysts by granulomatous inflammation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1978.tb04165.x
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  • 4
    Electronic Resource
    Electronic Resource
    New evidence of fungal nature of Dermocystidium koi Hoshina and Sahara, 1950 (1992)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of applied ichthyology 8 (1992), S. 0 
    Details
    ISSN: 1439-0426
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Dermocystidium koi Hoshina and Sahara, 1950 is characterized by formation of a web of aseptate hyplye which pervade the subcutaneous tissue of the host, Cyprinus carpio var. koi. Within the hyphae, multinucleate cytoplasmic contents eventually produce a large number of spores with a typical central refractile inclusion. They are of extremely variable size (diameter from 6.5 to 15 μm); there is some indication that the size range may reflect tle gradual growth of spores. Hyphae formation confirms the assumption of the fungal nature of this organism, yet its precise osition remains unsolved. The host reaction is first reflected in oedema formation, later with cellular infiltrate leading to proliferative inflammation followed by the formation of granulation tissue.〈section xml:id="abs1-2"〉〈title type="main"〉Zusammenfassung Ein neuer Beweis der pilzartigen Natur von Dermocystidium koi Hoshina und Sahara, 1950 Dermocystidium koi Hoshina und Sahara, 1950 wird durch ein Netz von aseptaten Hyphen charakterisiert, die das subkutane Gewebe seines Wirtes, Cyprinus carpio var. koi durchdringen. Die Hyphen enthalten ein vielkerniges Cytoplasma, woraus schließlich eine große Zahl von Sporen entsteht, die durch einen großen neutralen lichtbrechenden Körer gekennzeichnet werden. Sorengröße ist außerordentlich veränderlich mit einem Bereich von 6.5 bis 15 μm. Aus den durchefußrten Beobachtungen kann man vermuten, daß es sich urn ein progressives Wachstum der Sporen tandelt. Die Bildung van Hyphen bestätigt die Annahrne der Angehörigkeit von Dermocystidium zu den pilzartigen Organismen, eine genaue taxonomische Stellung kann man aber leider nicht beurteilen. Die Wirtsreaktion wird zuerst als Oedema zum Ausdruck gebracht, später als zelluläres Infiltrat und proliferative Entzündung. Der Prozeß wird durch Erscheinung von Granulationsgewebe vollendet.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1439-0426.1992.tb00681.x
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  • 5
    Electronic Resource
    Electronic Resource
    A skin disease of the eels caused by Myxobolus kotlami n. sp. (1986)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of applied ichthyology 2 (1986), S. 0 
    Details
    ISSN: 1439-0426
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: In elvers (Anguilla anguilla) imported yearly to a fish farm in Hungary the regular occurrence of a Myxobolus infection was recorded. The parasite produces oval or spherical plasmodia of 0.1–0.2·0.07–0.12mm in the subcutaneous and intermuscular connective tissue of the head. In each piasmodium about 200 to 400 spores develop which differ morphologically from the spores of all Myxobolus species known from the eel and other fishes. Based upon the characteristic location of plasmodia and spore morphology, this parasite is described as a new species, Myxobolus kotlani.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1439-0426.1986.tb00428.x
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  • 6
    Electronic Resource
    Electronic Resource
    Histopathological changes due to infections with Cryptobia iubilans Nohýnková 1984, in two cichlid fishes (1985)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of applied ichthyology 1 (1985), S. 0 
    Details
    ISSN: 1439-0426
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Histopathological study of infections with Cryptobia iubilans Nohýnková 1984 in two species of freshwater aquarium cichlids (Herichthys cyanoguttatum and Cichlasoma meeki) revealed severe tissue changes which were not limited to the digestive tract but also affected other principal body organs. The lesions were extensive enough to cause mortalities C. iubilans is thus far the only clearly pathogenic species among cryptobias infecting fish.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1439-0426.1985.tb00409.x
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  • 7
    Electronic Resource
    Electronic Resource
    Cryptobia branchialis Nie from fish gills: ultrastructural evidence of ectocommensal function (1980)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish diseases 3 (1980), S. 0 
    Details
    ISSN: 1365-2761
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: Abstract. Flagellates infesting the gills of freshwater fish are reviewed and Cryptobia branchialis Nie is differentiated from them. Gill filaments of two species of fish heavily infested with C. branchialis were examined with the transmission electron microscope. The flagellates are attached to the surface of the gill epithelium by their recurrent flagella. A prominent ridge on the flagellar membrane contacts the host cell membrane, forming a zone of gap junction and leaving a space of about 10 nm between the two membranes. The flagella do not penetrate into the epithelial cells. No other modifications of the cell membrane could be detected and the host cell reveals no signs of damage. Assumptions on the pathogenicity of C. branchialis are discussed in view of ultrastructural findings, which suggest that this flagellate is non-pathogenic and ectocommensal.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2761.1980.tb00426.x
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  • 8
    Electronic Resource
    Electronic Resource
    Ultrastructural study of Pisdnoodinium pillulare (Schäperclaus, 1954) Lom, 1981 with special emphasis on its attachment to the fish host (1983)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish diseases 6 (1983), S. 0 
    Details
    ISSN: 1365-2761
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: Abstract. Trophonts of Pisdnoodinium pillulare (Schäperclaus, 1954), a common ectoparasite of freshwater aquarium fish, are attached to host cells by means of a specialized structure, the attachment disc. Unlike other dinoflagellate genera parasitic on fish and invertebrates, this disc features nail-like organelles, the rhizocysts. Head-parts of the rhizocysts are inverted in separate compartments, rhizothecas, in the sole of the disc while their long shafts are firmly embedded in the cytoplasm of cells of the host epidermis or gill epithelium. The attachment inflicts a serious injury on the host cells which may ultimately be destroyed. Rhizocysts originate in the subnuclear cytoplasm from where they migrate into the attachment disc. There are other specialized organelles and inclusions; fibrous vesicles, membraneous bodies, striated tubular bodies and paracrystalline bodies. Pisdnoodinium has well-developed chloroplasts. While its cytological adaptations indicate a nutritional dependence on the host, there is no evidence of ingestion of host-derived particulate material. Pisdnoodinium may derive an essential part of its nutrition from photosynthesis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2761.1983.tb00096.x
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  • 9
    Electronic Resource
    Electronic Resource
    Fish coccidia: critical notes on life cycles, classification and pathogenicity (1981)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish diseases 4 (1981), S. 0 
    Details
    ISSN: 1365-2761
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: Abstract. The present knowledge of oocyst morphology, life cycles, classification and pathogenicity of eimeriid coccidia infecting fishes is reviewed. Compared with typical Eimeria species from higher vertebrates, fish coccidia, currently classified as all belonging to the same genus, differ in having, as a rule, a thin oocyst wall and endogenous sporulation. Some species possess a bivalved sporocyst, a structure and consequently an excystation mechanism, essentially different from that of the genus Eimeria. An analysis of the life cycles of more than 120 recorded species of fish coccidia has shown six different types of developmental patterns. The life cycles offish coccidia are compared with the life cycles of coccidia in general. None of the fish coccidia having a sporocyst with a Stieda body sporulates exogenously and therefore do not display a true eimerian developmental pattern. In view of the importance of sporocyst structure and developmental patterns in taxonomy, the revalidation of Labbé's genera Goussia and Crystallospora is proposed along with the establishment of a new genus, Epieimeria n.g. Most of the species offish coccidia are left within the genus Eimeria until new data make possible their correct classification. Detailed data on histopathological changes are available only in infections by two carp-infecting species, E. carpelli and E. subepithelialis and E. funduli infections in killifishes. The potential threat of coccidiosis in fishes reared under intensive conditions requires a thorough study of the pathogenicity of further species infecting commercially important hosts.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2761.1981.tb01161.x
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  • 10
    Electronic Resource
    Electronic Resource
    Some marine fish coccidia of the genera Eimeria Schneider, Epieimeria Dyková & Lom and Goussia Labbé (1982)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish diseases 5 (1982), S. 0 
    Details
    ISSN: 1365-2761
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: Abstract. Descriptions of six coccidian species infecting marine fishes are presented. Goussia cascosa sp.nov. is described from the visceral organs of the roughhead grenadier, Macrourus berglax Lacépède, from Newfoundland waters; it is a species closely related to G. gadi. Goussia luciae sp.nov. is described from the intestine of sea mullet, Mullus barbatus L., collected, as were the hosts of all the following species, from the French Mediterranean coast at Banyuls-sur-Mer. Goussia lucida (Labbé, 1893) is redescribed from the intestine of a new host, the lesser spotted dogfish, Scyliorhinus canicula (L.). Epieimeria isabellae sp.nov. is described from the intestine of conger eel, Conger conger L. Two species were provisionally allotted to the genus Eimeria: E. banyulemis sp.nov. from the intestine of axillary wrasse, Crenilabrus mediterraneus L., and Eimeria insignis sp.nov. from the intestine of scorpion fish, Scorpaena notata Rafinesque. Taxonomic affinities and the pathogenicity of these coccidian species are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2761.1982.tb00486.x
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