Fusarium sp. (Fungus or Burn Spot Disease) of Lobsters
Category 4 (Negligible Regulatory Significance in Canada)
Common, generally accepted names of the organism or disease agent
Fungus (Fusarium ) or Burn spot disease of juvenile lobsters.
Scientific name or taxonomic affiliation
Imperfect fungus Fusarium sp., possibly Fusarium solani.
Reported only from one lobster rearing facility in New York.
Homarus americanus. This same, or similar species, has also been reported on shrimps and prawns.
Impact on the host
Mortality due to gill dysfunction. Infected individuals do not survive molt.
Gross Observations: Black spots on exoskeleton and brownish discoloration of the gills.
Wet Mounts: Hyphae and conidia develop on and in gill lamellae.
Histology: Examine gills and exoskeleton for mycelia. Sections show hyphae in cuticular and subcuticular exoskeleton encapsulated and melanized.
Culture: Culture fungus on Sabouraud dextrose or fluid glycollate medium.
Methods of control
No treatment reported. Disease probably related to poor husbandry. Careful cleaning and maintenance of rearing systems are essential prophylaxis.
Brock, J.A. and D.V. Lightner. 1990. Diseases of Crustacea. Diseases caused by microorganisms. In: O. Kinne (ed.). Diseases of Marine Animals. Volume III: Introduction, Cephalopoda, Annelida, Crustacea, Chaetognatha, Echinodermata, Urochordata. Biologische Anstalt Helgoland, Hamburg, p. 339-344.
Sindermann, C.J. 1988. Fungus (Fusarium ) disease of lobsters. In: C.J. Sindermann and D.V. Lightner (eds.). Disease Diagnosis and Control in North American Aquaculture. Developments in Aquaculture and Fisheries Science 17. Elsevier, Amsterdam, p. 255-257.
Bower, S.M., McGladdery, S.E., Price, I.M. (1994): Synopsis of Infectious Diseases and Parasites of Commercially Exploited Shellfish: Fusarium sp. (Fungus or Burn Spot Disease) of Lobsters.
Date last revised: December 2006
Comments to Susan Bower
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