Ultrastructure of Spironucleus salmonis n. comb. (formerly Octomitus salmonis sensu Moore 1922, Davis 1926, and Hexamita salmonis sensu Ferguson 1979), with a guide to spironucleus species

Diseases of Aquatic Organisms
S L PoyntonHugh W Ferguson

Abstract

Diplomonad flagellates can be associated with significant morbidity and mortality in fishes, particularly in farmed salmonids. Diagnosis using only light microscopy is limited, and species cannot be confirmed. We therefore undertook a comprehensive transmission electron microscopy study of 20 trophozoites from the intestine of farmed juvenile rainbow trout Oncorhynchus mykiss from Northern Ireland (reported as Hexamita salmonis by Ferguson in 1979). Re-assignment to the genus Spironucleus was determined based on the anteriorly tapering and intertwined elongate nuclei, anterior-medial kinetosomes, and the presence of a flagellar pocket. At the species level we observed a tri-radiate pattern of microtubules in the opening of the asymetrical striated lamina, comprising 3 to 5 microtubules following the edge of the flagellar pocket, 3 radiating away from the opening of the striated lamina, and 4 to 5 curving over the striated lamina. We observed electron-dense plaques adjacent to the kinetosomes, electron-dense bodies, numerous free ribosomes, aggregations of glycogen, bowl-shaped membranous structures, rough endoplasmic reticulum, and a novel distinctive pyriform sac of densely packed free ribosomes at the posterior of the cell (8...Continue Reading

Citations

Sep 30, 2005·Avian Pathology : Journal of the W.V.P.A·S LloydJ S Gibson
Mar 31, 2010·Veterinary Pathology·C BaileyA D Miller
Apr 10, 2014·Journal of Zoo and Wildlife Medicine : Official Publication of the American Association of Zoo Veterinarians·Caries Juan-SallésSara Soto
Aug 24, 2010·The Journal of Eukaryotic Microbiology·Coralie O M MilletDavid Lloyd
Nov 25, 2006·The Journal of Eukaryotic Microbiology·Anders Jørgensen, Erik Sterud
Apr 15, 2016·Acta Parasitologica·Natalia DenikinaNatalia Belkova
Jul 20, 2012·The Veterinary Record·K SupamattayaM El-Matbouli

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