The Biology of Fish Coccidia

Davies, Angela J.; Ball, S. J.

doi:10.1016/s0065-308x(08)60210-9

Cited by 37 publications

(30 citation statements)

References 102 publications

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“…1) (Dykova & Lom 1981, Paperna & Cross 1985 and their sporocysts lack true Stieda and Substieda bodies (Paperna & Landsberg 1985, Davies 1990, Azevedo et al 1993. Piscine coccidia demonstrate extreme morphological and biological diversity, and consequently have been divided into several genera (Dykova & Lom 1981, Davies & Ball 1993. The purpose of this review is to summarize and update our knowledge on the ultrastructure and biology of piscine coccidia and to examine, in light of this new knowledge, our concept of the piscine coccidia's phylogenetic origin and affiliations.…”

Section: Introductionmentioning

confidence: 99%

Ultrastructural and developmental affinities of piscine coccidia

Paperna¹

1995

Dis. Aquat. Org.

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Piscine coccidia differ from terrestrial-host coccidia in having a soft, membranous oocyst wall. In contrast, however, to the structural and developmental conformity observed among the highly evolved and specialized monoxenous eimeriid coccidia of avian and mammalian hosts, piscine coccidia demonstrate extreme diversity in developmental sites, sporocyst morphology, macrogamont organization and oocyst wall formation. Sporozoites and some merozoites of several piscine coccidia contain refractile bodies, while those of others contain crystalline ones. Some are obligatorily heteroxenous, while in others transmission is mediated by paratenic hosts. Structural and developmental variability among piscine coccidia could imply a polyphyletic origin, but it could also be an evidence for a lower degree of evolutionary specialization. Many of the structural and developmental features found in piscine coccidia occur in other lower vertebrate and invertebrate-host coccidia, as well as in the heteroxenous cyst-formlng coccidia of higher vertebrates.

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Section: Introductionmentioning

confidence: 99%

Ultrastructural and developmental affinities of piscine coccidia

Paperna¹

1995

Dis. Aquat. Org.

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“…Microgamete development was typical of that seen in other fish coccidia (Lom andDyková 1992, Davies andBall 1993), including chromatin condensation within peripheral nuclei, nuclear constriction to create residual and DNA-containing microgamete nuclei, and the formation of perforatoria and associated flagella.…”

Section: Discussionmentioning

confidence: 66%

“…None of the Eimeria and Goussia species reported to infect the spleen of fishes Lom 1983, Davies andBall 1993) has been examined ultrastructurally to any extent. In infected gudgeon examined here, gamogonic stages and sporulated oocysts of G. metchnikovi were present.…”

Section: Discussionmentioning

confidence: 99%

“…Goussia metchnikovi occurs in the spleen of G. gobio in South East (SE) England (Ball 1983, Davies and Ball 1993, Davies and Stewart 2000. Lom and Dyková (1992) also recorded it from the liver and kidney of G. gobio and in whitefinned gudgeon, Gobio albipinnatus Lukasch, 1933 in Europe.…”

Section: Introductionmentioning

confidence: 98%

“…Lom and Dyková (1992) reported merogony and gamogony of G. metchnikovi in splenic tissue and sporogony to be endogenous. An inflammatory host response culminates in encapsulation of oocyst clusters (Pellérdy and Molnár 1968, Lom and Dyková 1992, Davies and Ball 1993, Dyková and Lom 2007 and this occurs in summer and autumn (Pellérdy and Molnár 1968).…”

Section: Introductionmentioning

confidence: 99%

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Utrastructural observations on Goussia metchnikovi (Laveran, 1897) in the spleen of gudgeon, Gobio gobio L.

Ball

Daszak

Davies

2012

Acta Parasitologica

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The ultrastructure of gamonts and sporulated oocysts of Goussia metchnikovi in the spleen of gudgeon, Gobio gobio from the river Lee, England is described. In developing microgamonts, small amylopectin granules were grouped centrally and nuclei were often arranged peripherally, close to the surface membrane. Nuclear chromatin condensed into peripheral dense portions that became the nuclei of flagellated microgametes, released to the parasitophorous vacuole. The cytoplasm of macrogametes had larger, scattered amylopectin granules, lipid globules and small electron-dense bodies, but no obvious wall forming bodies; peripheral vesicular structures with the appearance of mitochondria were also present and the parasitophorous vacuole contained flocculent material, but was otherwise free of structures. Sporulated oocysts contained four sporocysts and oocyst walls appeared to consist of a single membrane. Sporocyst walls showed a dehiscence suture, characteristic of the genus Goussia, which had filamentous extensions in places. The sporocyst wall comprised a dense inner layer and a thin outer layer with a fuzzy coat, separated by an electron lucent layer. Groups of oocysts were encapsulated by fibrous layers and inflammatory cells, and many sporocysts and their contained sporozoites showed evidence of elimination by the host.

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Eimerian infection in the gut of the tube-nosed gobyProterorhinus marmoratus (Pallas) of the River Danube

Molnár

1996

Syst Parasitol

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The Biology of Fish Coccidia

Cited by 37 publications

References 102 publications

Ultrastructural and developmental affinities of piscine coccidia

Ultrastructural and developmental affinities of piscine coccidia

Utrastructural observations on Goussia metchnikovi (Laveran, 1897) in the spleen of gudgeon, Gobio gobio L.

Eimerian infection in the gut of the tube-nosed gobyProterorhinus marmoratus (Pallas) of the River Danube

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