Mycotic Periostracal Sloughing of Mussels
Category 4 (Negligible Regulatory Significance in Canada)
Common, generally accepted names of the organism or disease agent
Mycotic periostracal sloughing of mussels, MPS.
Scientific name or taxonomic affiliation
A few locations on the coasts of Newfoundland and Prince Edward Island, Canada.
Impact on the host
Affected shells exhibit brown discolouration associated with sloughing of the periostracum. Mussel farmers and processors have expressed concern that MPS may affect marketability.
Gross Observations: Brown discolouration of the shell and possible evidence of sloughing of the periostracum.
Wet Mounts: Presence of fungal hyphae beneath the remaining periostracum of affected mussels.
Electron Microscopy: Fungal hyphae associated with the periostracum of affected mussels.
Methods of control
Concerns about the possibility of transferring MPS with mussel culture activities should be addressed through research efforts to understand the disease, identify the fungus involved, determine its current distribution and assess if the condition can be controlled or circumvented.
Moret, K., K. Williams, C. Couturier and J. Parsons. 1999. Newfoundland cultured mussel (Mytilus edulis) industry 1997 health survey. Bulletin of the Aquaculture Association of Canada 99-3: 35-37.
Bower, S.M. (2004): Synopsis of Infectious Diseases and Parasites of Commercially Exploited Shellfish: Mycotic Periostracal Sloughing of Mussels.
Date last revised: June 2004
Comments to Susan Bower
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