Zoothamnium duplicatum infestation of cultured horseshoe crabs (Limulus polyphemus)

[Display omitted] •Mass mortality event in a pilot, commercial scale horseshoe crab hatchery.•A protozoan infestation of juvenile horseshoe crabs.•The protozoan was identified as the sessile peritrich, Zoothamnium duplicatum.•Zoothamnium duplicatum colonised extensively the carapace and gills.•Treat...

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