Henneguya lesteri n. sp. (Myxosporea) is described from sand whiting, Sillago analis, the southern Queensland coast of Australia. H. displays a preference for pseudobranchs and typically positioned along afferent blood vessels, displacing adjoining lamellae disrupting their normal array. The plasmodia appeared as whitish-hyaline, elliptical cysts (mean dimensions 230 x 410 microm) attached to oral mucosa lining hyoid arch on inner surface operculum. Infections gills were also found, in which...

ABSTRACT The myxozoan parasite Ceratomyxa shasta is a significant pathogen of juvenile salmonids in the Pacific Northwest North America and limiting recovery Chinook ( Oncorhynchus tshawytscha ) coho O. kisutch salmon populations Klamath River. We conducted 5-year monitoring program that comprised concurrent sentinel fish exposures water sampling across 212 river kilometers used percent mortality degree-days to death measure disease severity fish. analyzed samples using quantitative PCR...

A coelomic myxozoan infection was detected in freshwater polychaetes, Manayunkia speciosa from the Klamath River, Oregon/California, a site enzootic for parasites Ceratomyxa shasta and Parvicapsula minibicornis. The tetractinomyxon type actinospores had near-spherical spore body 7.9 × 7.1 μm, with 3 spherical, protruding polar capsules, no valve cell processes, binucleate sporoplasm. minibicornis-specific primers Parvi1f Parvi2r amplified DNA infected polychaetes polymerase chain reaction...

SUMMARY Myxobolus cerebralis , the myxozoan parasite responsible for whirling disease in salmonid fishes, has a complex life-cycle involving an invertebrate host and 2 spore stages. Water flow rate is environmental variable thought to affect establishment propagation of M. ; however, experimental data that separates effects from those other variables are scarce. To compare how this parameter affected infection dynamics vertebrate hosts, dead, infected fish were introduced into naïve habitat...

Abstract The parasite responsible for salmonid whirling disease, Myxobolus cerebralis, was introduced to the USA in 1958. It has since spread across country causing severe declines wild trout populations, but never been documented from Alaska. However, while assessing risk of introduction M. cerebralis into state, we detected using a species‐specific polymerase chain reaction (PCR) assay. Testing 180 hatchery rainbow trout, Oncorhynchus mykiss (Walbaum), by pepsin trypsin digest (PTD) and...

Journal of Fish DiseasesVolume 25, Issue 10 p. 627-631 Molecular characterisation two aurantiactinomyxon (Myxozoa) phenotypes reveals one genotype S L Hallett, Hallett Institute Zoology, Biology and Diseases, University Munich, GermanySearch for more papers by this authorS D Atkinson, Atkinson authorM El-Matbouli, M El-Matbouli author First published: 21 October 2002 https://doi.org/10.1046/j.1365-2761.2002.00405.xCitations: 29 Dr Kaulbachstrasse 37, 80539 Germany. (e-mail:...

DAO Diseases of Aquatic Organisms Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsSpecials 85:147-155 (2009) - DOI: https://doi.org/10.3354/dao02068 Complete life cycle Myxobolus rotundus (Myxosporea: Myxobolidae), a gill myxozoan common bream Abramis brama Cs. Székely1,*, S. L. Hallett2, D. Atkinson2, K. Molnár1 1Veterinary Medical Research Institute, Hungarian Academy Sciences, PO Box 18, 1581 Budapest,...

Manayunkia speciosa is the obligate invertebrate host of Ceratonova (syn Ceratomyxa) shasta (Myxozoa), parasite that causes ceratomyxosis (enteronecrosis) in salmon and trout. High peak discharge has been correlated with reduced hosts but how it may influence dynamics unknown. We sampled M. populations from three sections Klamath River, California, spring summer months 2006, a water year was characterized by i) winter equivalent magnitude to 10 flood ii) low risk for salmon. were observed...

Abstract Salmon in the Klamath River of northern California contend with water temperatures that reach stressful and sometimes lethal levels during summer, forcing them to seek thermal refuge at coolwater tributary junctions. During migration, these fish also encounter a range pathogens affect their survival. A significant myxozoan parasite, Ceratonova shasta , causes enteronecrosis salmon, this disease increases severity as temperature parasite dose increase. In complementary laboratory...

ABSTRACT This is the first ultrastructural study of development a marine actinosporean and species belonging to genus Sphaeractinomyxon Caullery & Mesnil, 1904. S. ersei n. sp. described from limnodriloidine oligochaete, Doliodrilus diverticulatus Erséus, 1985, Moreton Bay. Queensland, Australia. Development asynchronous, there being all stages two‐celled pansporoblasts through mature spores present simultaneously within host. Spores develop in groups eight coelom when are located also...

Although widespread throughout the continental United States, Myxobolus cerebralis, myxozoan parasite that causes whirling disease in salmonids, has not been reported from state of Alaska. As part a risk assessment for introduction and establishment M. cerebralis into Alaska, distribution invertebrate host Tubifex tubifex was surveyed, its genetic composition susceptibility to were determined. Many oligochaetes, but no T. tubifex, collected southeastern Alaska; however, 4 lineages (I, III,...

In February 2004, a mass die-off of common goldfish Carassius auratus L., presumptively caused by bacterial coldwater disease (Flavobacterium psychrophilum), occurred at Fern Ridge Reservoir, Oregon. A range size classes was affected, but all mature fish were female and infected with single myxozoan, Chloromyxum auratum n. sp. No histological changes observed associated the parasite. Infection represented mictosporic plasmodia free-floating spores in gall bladder. Parasite nearly spherical,...

Abstract Genotypes of the myxosporean parasite Ceratonova shasta are defined by number ATC repeats in parasite's ribosomal DNA internal transcribed spacer region 1. These genotypes correlate with specific salmonid fish hosts. We observed coho salmon ( Oncorhynchus kisutch ) and rainbow trout mykiss mixtures II III, assumed that this was a consequence having an aggregate infection from multiple individual parasites. hypothesized although ITS copies present within spore, sequences these...