MSX disease of oysters caused by Haplosporidium nelsoni
The parasite can cause annual mortalities of up to 90% during an initial outbreak and chronic losses of 50% per year thereafter, with reductions in shell growth, meat quality, and reproductive capabilities among still-infected survivors.
This is a revision and update of Identification Leaflet 38, original by Jay. D. Andrews.
Published under the auspices of the following ICES Steering Group or Committee