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Black spot disease (BSD), Chitinolytic bacterial disease, Shell disease, Brown spot disease, Burned spot disease, Rust disease.
Scientific name or taxonomic affiliation
Ubiquitous, especially evident on shrimp held in long term captivity/culture.
Numerous species of wild and cultured marine and freshwater shrimps, also lobsters, and many species of crabs and crayfish.
Impact on the host
The exoskeleton becomes pitted, eroded, and melanized at the site of infection.
Gross Observations: Erosion of chitin demarked by dark brown to black pigmentation demonstrates chitinolysis.
Histology: Progressive necrosis, inflammation and subsequent melanization of the body surface and appendages.
Culture: Culture lesion on marine agar. Test isolated bacteria for chitinolytic activity in saline solution with thin chitin strips.
Methods of Control
No known treatment. Shell disease can be managed in captive and cultured populations by reducing crowding, wound avoidance, proper husbandry, and system hygiene.
HEALTH MANAGEMENT & DISEASE CONTROL INDEX
Hepatopancreatic parvo-like virus (HPV) . Reo-like virus (REO) . Lymphoid organ vacuolization virus (LOVV) . Taura Syndrome Virus (TSV) . Rhabdovirus of Penaeid Shrimp (RPS) . White Spot Syndrome Virus (WSSV) . Infectious hypodermal and hematopoietic virus (IHHNV) . Baculovirus penaei (BP)
Vibriosis . Epicommensal fouling disease (filementous bacteria) . Necrotizing Hepatopancreatitis (NHP) . You are here . Mycobacteriosis
Larval mycosis . Fusariosis
Haplosporidia . Gregarines . Cotton Disease
Black Gill Disease (BGD) Dissolved Oxygen Crisis Nitrogen Gas Bubble Disease