nodular and other pathogens Flashcards
(18 cards)
Lymphocystis agent
Lymphocystisvirus group
Lymphocystis hosts and distribution
> 100 freshwater and marine
↑seabream
↑sparidae
↑young
Cosmopolitan
Lymphocystis symptoms
pearl-like nodules (0.5-2mm) on skin and fins
● chronic: lymphocytes, macrophages and plasma cells
● fibroblast hypertrophy
● chronic lymphoid dermatitis with bening course
● nodules (0.5-2mm) on skin and fins
Lymphocystis diagnosis
clinical signs + histology
cauliflower disease cause in eel: agent and symptoms
birnavirus
bening tumoral mass in eel
Infectious pancreatic necrosis (IPN) agent and affected species and distribution
Birnavirus
salmonids (trouts <60 days up to <5 months) + invertebrate vectors
cosmopolitan
Infectious pancreatic necrosis (IPN) symptoms
● melanosis
● exophthalmos
● severe pancreatic necrosis
● anorexia
● ventral skin hemorrhages + pale gills
● abnormal swimming
● abdominal swelling + stomach swelling + ascites
winter disease cause and host
● ↓T 6.5-18°C
● malnutrition
● physiological imbalance due to sharp ↓T
seabream circa 1 year
winter disease symptoms
Types:
● acute: Dec-Feb T<12°C
● chronic March-April T 15-17°C
External:
● emaciation + steatosis
● ascites + intestine filled with fluid and mucus + ecstatic gallbladder (overly filled or swollen with bile)
● anemia
● necrosis in fins
● skin erosions
● keratitis
enteromyxosis agent and lesion
enteromyxum leei
marine waterborne
enteritis
papilloma in mouth, head and barbels in brown bullhead
tubercolosis agents and hosts
gram +
● Mycobacterium marinum
● M. fortuitum
● M. chelonae
hosts: all >160
tubercolosi symptoms
● lethargy
● anorexia→emaciation
● exophthalmus
● white skin patches
● scale loss
● fin rot
● skin ulcers
● internal granulomas filled with bacteria
Photobacteriosis or Pastulleurosis
or Pseudotuberculosis agent, species and transmission
Photobacterium damselae gram -
marine
● seabass: ongrowing
● sea bream: fry and fingelings
● mullet
● yellow fin tuna
● sole
USA, EU, Japan
horizontal
Contributing factors:
● ↑T: T>18-20°C, outbreaks if T>25°C
● ↑δ
Photobacteriosis or Pastulleurosis
or Pseudotuberculosis sympthoms:
● typical septicemia
● granulomas in liver and kidney
● splenomegaly
Proliferative Kidney Disease (PKD) or swollen kidney disease agent, T, hosts:
Tetracapsuloides bryosalmonae,
salmonids
T>14°C
Proliferative Kidney Disease (PKD) or swollen kidney disease symptoms
kidney large and grayish
Bacterial kidney disease agent, hosts and transmission
Renibacterium salmoninarum
gram +
salmonids
vertical + horizontal
Bacterial kidney disease symptoms
● Lethargy
● melanosis
● Exophthalmos
● Pale gills
● Ascites
● Blisters
● Focal, multi-focal grey nodules→glomerular nephritis
● Enlarged kidney and greyish
● Hemorrhage in abdominal wall
● Pseudomembrane (fibrinous cast over visceral organs)
● focal pyo-/granuloma (macrophages + lymphocytes), may caseate
● glomerular nephritis
