Crayfish Pathology Gallery
 
The Crayfish Pathology Gallery is a collection of around 100 light and electron micrographs of pathogens and disease conditions of freshwater crayfish. The Crayfish Pathology Gallery represents a complete catologue of my work as a crayfish pathologist and virologist. I hope that it is of value to fellow pathologists and virologists in their study of disease conditions in freshwater crayfish and in other aquatic animals.
 
Almost all photographs were taken by myself from my own work. If I have included a photograph supplied by a colleague, or a micrograph by me of a slide supplied by a colleague, this has been acknowledged in the caption. Please do not reproduce these photographs without first obtaining my permission.
 
Sincerely Brett F Edgerton

 

Viruses
Light micrograph of hepatopancreatocytes of Cherax quadricarinatus infected by bacilliform virus (CqBV).
Light micrograph of acute infection by Cherax quadricarinatus bacilliform virus (CqBV).
Electron micrograph of hepatopancreatocyte of Cherax quadricarinatus infected by bacilliform virus (CqBV).
Light micrograph of hepatopancreatocytes of Cherax destructor infected by bacilliform virus (CdBV).
Electron micrograph of hepatopancreatocyte of Cherax destructor infected by bacilliform virus (CdBV).
Light micrograph of hepatopancreatocytes of Astacus astacus infected by bacilliform virus (AaBV).
Electron micrographs showing the morphologies of the crayfish gut-infecting intranuclear bacilliform viruses.
Light micrograph gill epithelial cells of Cherax quadricarinatus infected by a putative parvo-like virus.
Electron micrograph gill epithelial cells of Cherax quadricarinatus infected by a putative parvo-like virus.
Electron micrograph of putative parvo-like virus in the gill of Cherax quadricarinatus.
Light micrograph of gill necrosis associated with Cherax destructor systemic parvo-like virus.
Light micrograph of Cherax destructor systemic parvo-like virus Cowdry type A inclusion in gill.
Electron micrograph of Cherax destructor systemic parvo-like virus.
Light micrograph of spawner isolated mortality virus infection in the midgut of Cherax quadricarinatus detected by in-situ hybridisation (Photograph supplied by Dr Leigh Owens).
Light micrograph of a hepatopancreatic tubule of Cherax quadricarinatus infected by a putative reo-like virus.
Light micrograph of a hepatopancreatocytes of Cherax quadricarinatus infected by a putative reo-like virus (higher magnification).
Electron micrograph of a putative reo-like virus which infects hepatopancreatocytes of Cherax quadricarinatus.
Light micrograph of hepatopancreatocytes of Cherax quadricarinatus infected by Cherax Giardiavirus-like virus (CGV).
Light micrographs showing staining reactions for the inclusions of Cherax Giardiavirus-like virus (CGV).
Light micrograph of a nucleus infected by both CGV and CqBV.
Electron micrograph of Cherax Giardiavirus-like virus (CGV).
Light micrograph of antennal gland cells of Cherax destructor infected by a picorna-like virus. (histological slide provided by Brian Jones, Photograph by Brett Edgerton)
  
Electron micrograph of the picorna-like virus in Cherax destructor. (Photograph supplied by Brian Jones)
    

 

 

Bacteria
Light micrograph of hepatopancreas of Cherax quadricarinatus with bacteraemia (low magnification)
Light micrograph of hepatopancreas of Cherax quadricarinatus with bacteraemia (higher magnification)
Light micrograph of hepatopancreas of Cherax quadricarinatus with bacteraemia (early stage lesion)
Light micrograph of antennal gland of Cherax quadricarinatus with bacteraemia (low magnification)
Light micrograph of enteric bacterial infection in Cherax quadricarinatus (low magnification)
Light micrograph of enteric bacterial infection in Cherax quadricarinatus (higher magnification)
Light micrograph of enteric bacterial infection in Cherax quadricarinatus (early stage lesion)
Light micrograph of enteric bacterial infection in Cherax destructor (low magnification)
Light micrograph of enteric bacterial infection in Cherax destructor (higher magnification)
Light micrograph of Cherax quadricarinatus with eye necrosis (early stage lesion)
Light micrograph of Cherax quadricarinatus with eye necrosis (early stage lesion; higher magnification)
Light micrograph of Cherax quadricarinatus with eye necrosis (advanced stage lesion)
Light micrograph of filamentous bacteria attached to the gills of Cherax quadricarinatus.
Light micrograph of systemic rickettsia-like organism infection of the cuticular epithelium of Cherax quadricarinatus.
Light micrograph of systemic rickettsia-like organism infection of the hepatopancreas of Cherax quadricarinatus.
Light micrograph of systemic rickettsia-like organism infection of the antennal gland of Cherax quadricarinatus.
Light micrograph of systemic rickettsia-like organism infection of haemocytes of Cherax quadricarinatus.
Light micrograph of rickettsia-like organism infection of hepatopancreatocytes of Cherax quadricarinatus (low magnification).
Light micrograph of rickettsia-like organism infection of hepatopancreatocytes of Cherax quadricarinatus (high magnification).
Light micrograph of rickettsia-like organism infection of hepatopancreatocytes of Cherax quadricarinatus (Brown and Brenn Gram stain).
Electron micrograph of rickettsia-like organism infection of hepatopancreatocytes of Cherax quadricarinatus.

 

 

Protozoans
Light micrograph of heavy Psorospermium sp. infection in antennal gland of Cherax quadricarinatus with eye necrosis.
Light micrograph of heavy Psorospermium sp. infection in gill of Cherax quadricarinatus.
Light micrograph showing morphology of Psorospermium sp. infection in haemopoietic tissue of Cherax quadricarinatus.
Light microcrograph of uncommon form of Psorospermium sp. in Cherax quadricarinatus.
Light micrograph of heavy infection of sub-cuticular connective tissue of Astacus astacus by Psorospermium haeckeli
Light micrograph showing morphology of Psorospermium haeckeli infection in connective tissue of Astacus astacus.
Light micrograph of an unidentified microsporidian infecting connective tissue in Cherax quadricarinatus (haemocytes have also infiltrated adjacent muscle).
Light micrograph of an unidentified microsporidian infecting connective tissue in Cherax quadricarinatus (showing pansporoblasts).
Light micrograph showing morphology of spores of an unidentified microsporidian infecting connective tissue in Cherax quadricarinatus.
Light micrograph of Thelohania-like species infecting striated muscle of Astacus astacus.
Light micrograph of Thelohania-like species infecting myocardium of Astacus astacus.
Light micrograph of Tetrahymena pyriformis infection of hepatopancreas of Cherax quadricarinatus.
Light micrograph of Tetrahymena pyriformis infection of hepatopancreas of Cherax quadricarinatus (in haemolymph vessel and free in haemocoel).
Light micrograph of Tetrahymena pyriformis infection of gill of Cherax quadricarinatus.
Light micrograph of Tetrahymena pyriformis inserting itself into a hepatopancreatocyte of Cherax quadricarinatus.
Severe fouling of Cherax quadricarinatus by Epistylus. (or is it an Alaskan crayfish?)

 

Fungi
Light micrograph of unidentified fungus in the hepatopancreas of Cherax quadricarinatus.
Light micrograph of unidentified fungus in the hepatopancreas of Cherax quadricarinatus.
Light micrograph of unidentified fungus in the hepatopancreas of Cherax quadricarinatus (silver methanamine stain).
Light micrograph of unidentified fungus in the gills of Cherax destructor.
Light micrograph of unidentified fungus in the gills of Cherax destructor (Grocott’s stain).

 

Idiopathic Lesions
Black spots on exoskeletion of Cherax quadricarinatus
Light micrograph of haemocytic infiltration and sloughing of cells in the antennal gland of Cherax quadricarinatus.
Light micrograph of haemocytic infiltration and sloughing of cells in the antennal gland of Cherax quadricarinatus (higher magnification showing cytoplasmic inclusion in sloughed cell).
Light micrograph of crystals in antennal gland of Cherax quadricarinatus.
Light micrograph of crystals in antennal gland of Cherax quadricarinatus
Light micrograph of haemocytic enteritis in Cherax quadricarinatus.
Light micrograph of haemocytic enteritis in Cherax quadricarinatus (more advance lesion).
Light micrograph of thickening of haemolymph vessels in hepatopancreas of Cherax quadricarinatus.
Light micrograph of thickening of haemolymph vessels in hepatopancreas of Cherax quadricarinatus Ð eosinophilic inclusions in endothelial cells.
Light micrograph of multi and mononucleated giant cells in antennal gland of Cherax quadricarinatus.
Light micrograph of multinucleated giant cells in antennal gland of Cherax quadricarinatus.
Light micrograph of multinucleated giant cells in antennal gland of Cherax quadricarinatus.

 

Non-infectious diseases
Light micrograph of iron inclusions in hepatopancreas of Cherax quadricarinatus (Perl’s Prussian Blue).
Light micrograph of iron inclusions in hepatopancreas of Cherax quadricarinatus (Perl’s Prussian Blue; higher magnification).

 

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