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Additional Nutritional Factors
Water Quality Action and Reaction
Water Quality Management and Biofilter Maintenance
Post larval fitness parameters
YOU ARE IN HEALTH MANAGEMENT
Risk Management, Bio-security and HACCP Implementation
System Disinfection Procedures
Record Keeping and Report Templates
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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
Chitinolytic bacteria (Gram negative rods) including Vibrio spp. (=Benekea spp.), Pseudomonas spp., Aeromonas spp., Spirillum, spp. and Flavobacterium spp.
Geographic distribution
Ubiquitous, especially evident on shrimp held in long term captivity/culture.
Host species
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.
Diagnostic techniques
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.
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. HEALTH MANAGEMENT & DISEASE CONTROL INDEX
Variables to be used in health evaluation
Health evaluation tests
Wet Mount Procedure . PL visual examination . Stress test for post larva . Gill examination . Mid-gut Examination . Stomach Contents AnalysisShrimp Diseases
Viruses
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)
Bacterial Diseases
Vibriosis . Epicommensal fouling disease (filementous bacteria) . Necrotizing Hepatopancreatitis (NHP) . You are here . Mycobacteriosis
Fungal Diseases
Larval mycosis . Fusariosis
Protozoans
Haplosporidia . Gregarines . Cotton Disease
Other
Black Gill Disease (BGD) Dissolved Oxygen Crisis Nitrogen Gas Bubble DiseaseDisease control
Decreasing density, partial or early harvests . Drugs, chemicals and treatments . Sanitation.