Fish practical Flashcards
Label
Label
What is this
Gills
What is this
diseased gills
What histopathology samples are collected for fish
Gill, heart, liver, pyloric caecae, spleen, hindgut, kidney, skin/muscle
From where are blood samples collected in fish?
Blood can be sampled from caudal/tail vein
What are signs of disease seen on a fish farm
Elevated mortality
Inappetance
Poor growth/ill thrift
Moribund/lethargic individuals (best for diagnostic sampling!)
Signs of respiratory distress/gasping
Erratic swimming behaviour (e.g. corkscrewing)
What are external signs of disease in fish
Discolouration (pale or dark)
Congestion/bleeding skin (especially fin bases)
Exophthalmia or hyphaema
Skin ulcers or wounds
Gil pathology- pale, mucus patches, bleeding etc
Presence of external parasites
Fin erosion
What sign of disease is seen here?
Furuncle in skin
What sign of disease is seen here?
external ulcer
What sign of disease is seen here?
ulcerative jaw lesions
What sign of disease is seen here?
exophthalmia
What sign of disease is seen here?
skin haemorrhage/congestion (cardiomyopathy syndrome)
What sign of disease is seen here?
gill mucus plaques
What sign of disease is seen here?
sea lice
What are internal signs of disease in fish?
Congestion/discolouration of tissues
Bleeding/haemorrhage (petechiae to frank bleeding)
Ascites
Focal lesions in viscera or muscle
What sign of disease is seen here?
Swim bladder haemorrhage (bacterial septicaemia)
What sign of disease is seen here?
Petechial bleeding on swim bladder surface (bacterial - Aeromonas salmonicida)
What sign of disease is seen here?
Ecchymotic haemorrhage in liver (bacterial - Moritella viscosa)
What sign of disease is seen here?
Blood clot obscuring heart due to ruptured atrium (Viral - Cardiomyopathy syndrome)
What sign of disease is seen here?
Congested liver with fibrinous pseudomembrane (viral - Cardiomyopathy syndrome)
