Parallel studies confirm Francisella halioticida causes mortality in Yesso scallops Patinopecten yessoensis.

Francisella halioticida is a marine bacterium originally described as the causative agent of mass mortality among giant abalone Haliotis gigantea. Recent field studies in Canada and Japan have suggested that this bacterium is also the cause of adductor muscle lesions and high mortality of Yesso scallops Patinopecten yessoensis, although a causal relationship has not been established. In the present study, the pathogenicity of F.

Molecular taxonomy of Mikrocytos boweri sp. nov. from Olympia oysters Ostrea lurida in British Columbia, Canada.

Mikrocytos mackini is a microcell parasite that usually infects Crassostrea gigas distributed along the Pacific Northwest coast of North America. For many years, M. mackini was the only known species in the genus, but there have been multiple recent findings of genetically divergent forms of Mikrocytos in different hosts and in distantly located geographic locations.

The diversity of microsporidia in parasitic copepods (Caligidae: Siphonostomatoida) in the Northeast Pacific Ocean with description of Facilispora margolisi n. g., n. sp. and a new Family Facilisporidae n. fam.

Three distinct microsporidia were identified from parasitic copepods in the northeast Pacific Ocean. Sequencing and phylogenetic analysis of a partial small subunit ribosomal RNA gene (SSU rDNA) sequence identified a genetically distinct variety of Desmozoon lepeophtherii from Lepeophtheirus salmonis on cultured Atlantic salmon Salmo salar, and this was confirmed by transmission electron microscopy. Phylogenetic analysis resolved the SSU rDNA sequence of the second organism in a unique lineage that was most similar to microsporidia from marine and brackish water crustaceans.

The occurrence of Lepeophtheirus salmonis and Caligus clemensi (Copepoda: Caligidae) on three-spine stickleback Gasterosteus aculeatus in coastal British Columbia.

Infections with sea lice species belonging to Lepeophtheirus and Caligus are reported from examinations of 1,309 three-spine sticklebacks collected in coastal British Columbia. Over 97% of the 19,960 Lepeophtheirus specimens and nearly 96% of the 2,340 Caligus specimens were in the copepodid and chalimus developmental stages. The parasites were identified as Lepeophtheirus salmonis and Caligus clemensi based on morphology of adult stages.