Two species of <i>Kudoa</i> (Myxosporea: Multivalvulida) parasitic in the flesh of <i>Merluccius productus</i> (Ayres, 1855) (Pisces: Teleostei) in the Canadian Pacific

Kabata, Z.; Whitaker, David

doi:10.1139/z81-285

Cited by 77 publications

(61 citation statements)

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“…Several of the species (e.g. K, lunata, K. miniaunculata, K. paniformls, K. thyrsites) are intracellular parasites as their site of infection is within the muscle fiber (Gilchrist 1924, Kabata & Whitaker 1981, Lorn et al 1983, Whitaker et al 1996.…”

Section: Discussionmentioning

confidence: 99%

Development of Kudoa thyrsites (Myxozoa:Myxosporea) in netpen-reared Atlantic salmon determined by light microscopy and a polymerase chain reaction test

Moran

Margolis²,

Webster³

et al. 1999

Dis. Aquat. Org.

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The intramuscular phase of development of Kudoa thyrsites, the myxosporean associated with post-mortem myoliquefaction, or 'soft flesh syndrome', is described using histological preparations of the musculature of seawater netpen-reared Atlantic salmon Salmo salar. Hatchery-reared Atlantic salmon were naturally exposed to the infective stage whlle held in the expenmental seawater netpens of the Pacific Biological Station in Nanaimo, British Columbia, Canada. In fish exposed during the summer of 1995, K. thyrsites infections were first detected in the somatic musculature at 13 wk postexposure (p.e.) using only light microscopy. In the 1997 exposure, infections were first detected at 6 wk p.e. using a PCR test and at 9 wk p.e. using light microscopy. The earliest stage detected by histology was a small plasmodium containing 4 nuclei. No host response was observed that was directly related to the presence of intact plasmodia within muscle fibers. However, a response was associated with ruptured plasmodia, which was characterized by chronic, multlfocal inflammation between the muscle fibers.

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Section: Discussionmentioning

confidence: 99%

Development of Kudoa thyrsites (Myxozoa:Myxosporea) in netpen-reared Atlantic salmon determined by light microscopy and a polymerase chain reaction test

Moran

Margolis²,

Webster³

et al. 1999

Dis. Aquat. Org.

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“…Other species have been found in extramuscular localisations, e.g., gills, brain, kidney, gallbladder, and ovaries (Swearer and Robertson 1999). Of the muscle-infecting species, the agents of post-mortem myoliquefaction (K. thyrsites, K. paniformis and K. miniauriculata), have been frequently studied and papers describing their biology, impact of infections on the aquaculture industry and commercial fisheries and diagnostic methods have been published (Egusa and Nakajima 1980, Kabata and Whitaker 1981, Patashnik et al 1982, Langdon et al 1992, Whitaker and Kent 1992, Moser and Kent 1994, Whitaker at al. 1996, Moran et al 1999.…”

Section: Kudoa Dianae Sp N (Myxosporea: Multivalvulida) a New Paramentioning

confidence: 99%

Kudoa dianae sp. n. (Myxosporea: Multivalvulida), a new parasite of bullseye puffer, Sphoeroides annulatus (Tetraodontiformes: Tetraodontidae)

Dyková¹,

Avila²,

Fiala³

2002

FOLIA PARASIT

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Abstract.A new multivalvulid myxosporean species, Kudoa dianae sp. n., is described from bullseye puffer, Sphoeroides annulatus (Jenyns) (Tetraodontiformes: Tetraodontidae). Plasmodia develop in extramuscular sites, in the wall of oesophagus and less frequently on mesenteries. Mature spores can reach lumen of the digestive tract directly by disruption of plasmodial wall or via macrophage transport to the oesophageal epithelium. New species is characterised by morphology of spores and by the complete sequence of SSU rRNA gene that differs from all hitherto known sequences of Kudoa species. Spore morphology (moderate-sized, simple non-ornate spores, quadrate in apical view) clusters with that of Kudoa scienae, K. cerebralis, K. chilkaensis, K. leiostomi, K. funduli, K. cascasia and K. ovivora. Analysis of phylogenetic relationships (using SSU rRNA gene sequences) among five Kudoa species, the molecular data of which are available thus far, revealed that K. dianae is distinguishable from these five species and that its closest relation is with K. miniauriculata.

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“…As to the members of Multi valvulida the criterion of the measurement of spores had not been fixed. The present scheme referred to that employed by KABATA and WHITAKER (1981) for the measurement of Kudoa spores. Spores were not always regular polygonal in anterior view and the polar capusles were also not always uniform in size and shape even in a given spore, as will be mentioned later.…”

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A myxosporean of the order multivalvulida from the brains of Lateolabrax japonicus and some other marine fishes.

Egusa

1986

Fish Pathol.

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A myxosporean found in the brains of Lateolabrax japonicus, Seriola quinqueradiata, Pagrus major and Takifugu rubripes was characterized by producing two forms of spores; hexaradiate spores with six shell valves and six polar capsules and heptaradiate spores with seven shell valves and seven polar capsules. The description of these forms was given. These two forms of spores coexisted in intracerebral pseudocysts and extracerebral cysts in all the fish studied. The ratio be tween the two was variable.The generally accepted principle that the number of shell valves is constant in a given species of the order Multivalvulida and therefore serves as the main family criterion does not apply to this myxosporean.From the observations it may be assumed that one of the two forms is abnormal due to an unusual cell division, or this myxosporean is on an extention of the Trilospora-Kudoa-Penta capsula-Hexacapsula evolutinary line, but its character is still genetically unfixed. Further research on these questions is needed to discuss the systematic position of this myxosporean.

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Two species of Kudoa (Myxosporea: Multivalvulida) parasitic in the flesh of Merluccius productus (Ayres, 1855) (Pisces: Teleostei) in the Canadian Pacific

Cited by 77 publications

References 0 publications

Development of Kudoa thyrsites (Myxozoa:Myxosporea) in netpen-reared Atlantic salmon determined by light microscopy and a polymerase chain reaction test

Development of Kudoa thyrsites (Myxozoa:Myxosporea) in netpen-reared Atlantic salmon determined by light microscopy and a polymerase chain reaction test

Kudoa dianae sp. n. (Myxosporea: Multivalvulida), a new parasite of bullseye puffer, Sphoeroides annulatus (Tetraodontiformes: Tetraodontidae)

A myxosporean of the order multivalvulida from the brains of Lateolabrax japonicus and some other marine fishes.

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