Haplosporidosis of Crabs
Category 1 (Not Reported in Canada)
Common, generally accepted names of the organism or disease agent
Haplosporidosis, Haplosporidian disease.
Scientific name or taxonomic affiliation
Haplosporidium louisiana in mud crabs and an undescribed Minchinia-like species in blue crabs.
Eastern coast of the United States.
Callinectes sapidus as well as several species of mud crabs (i.e., Panopeus herbstii, Eurypanopeus depressus, Rhithropanopeus harrisii).
Impact on the host
Causes haemocytic dysfunction. The disease is considered to be lethal but the prevalence is rare.
Gross Observations: Sluggishness, drawn haemolymph is opaque white, of low viscosity, and fails to clot properly.
Histology: Masses of uninucleate (3.4-7.3 µm in diameter with nuclei 1.1-2.2 µm in diameter) or multinucleate plasmodial bodies filling vascular spaces and interstitial tissues.
Electron Microscopy: Ultrastructural details indicate that the species in blue crabs is different from those in oysters and mud crabs.
Methods of control
No known methods of prevention or control.
Messick, G.A. and C.J. Sindermann. 1992. Synopsis of principal diseases of the blue crab, Callinectec sapidus. NOAA Technical Memorandum NMFS-F/Nec-88. 24 p.
Newman, M.W., C.A. Johnson and G.B. Pauley. 1976. A Minchinia-like haplosporidan parasitizing blue crabs, Callinectes sapidus. Journal of Invertebrate Pathology 27: 311-315.
Sparks, A.K. 1985. Synopsis of Invertebrate Pathology Exclusive of Insects. Elsevier Science Publishing Co., Amsterdam. p. 294-295.
Bower, S.M., McGladdery, S.E., Price, I.M. (1994): Synopsis of Infectious Diseases and Parasites of Commercially Exploited Shellfish: Haplosporidosis of Crabs.
Date last revised: Fall 1994
Comments to Susan Bower
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