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Fungal disease of marine fish • Fungi, opportunistic, weak pathogen • Pathogenic, when stressful & reduce def

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Fungal disease of marine fish • Fungi, opportunistic, weak pathogen • Pathogenic, when stressful & reduce defences • Uncommon in estuarine & marine ecosystem • Pathogenic fungi, Ichthyophonus , ulcerative syndrome, redspot disease/epizootic ulcerative syndrome.

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Presentation Transcript
slide1

Fungal disease of marine fish

• Fungi, opportunistic, weak pathogen

• Pathogenic, when stressful & reduce

defences

• Uncommon in estuarine & marine

ecosystem

• Pathogenic fungi, Ichthyophonus, ulcerative

syndrome, redspot disease/epizootic

ulcerative syndrome

slide2

1. Ichthyophonus

• Fungus-like, systemic infection, cold water

• Pathology depend host, dosage, species

fungus

• Gross signs, loss equilibrium, abnormal pig-

mentation,abdominal distention, muscle

athrophy, spinal curvature, roughening skin,

ulcers

• Internal, white nodule escp vascular organ

(kidney,heart,spleen,liver),hyperpigmentation

slide3

• Muscle liquefaction seen in acute cases

• Early stage mononuclear infiltrate, chronic

form chronic inflamatory

• Obligate pathogen, transmission by feeding

spore, water-borne, amoeboid penetrate

mucosa, entering bloodstream

2. Ulcerative mycosis

• Very deep penetrating lesion, commonly

perforate body wall

slide4

• Lesion infected by bacteria & protozoa

• High mortality, systemic bacterial infection

• Lesion, UM begin as skin infection under-

lying muscle & viscera

• Skin lesion, up to 5 mm, red-yellow foci,

mononuclear infiltrate

• Fungal infection, near skin surface, invasion

underlying muscle

• Large ulcers, fungal hyphae, bacteria,

necrotic muscle

slide5

• Fungi in UM lesion, Aphanomyces,

Saprolegnia

• Saprolegniaceous common in freshwater,

form fuzzy, cottony growth on skin

3. Redspot disease/ epizootic ulcerative syndrome

• 1980 EUS reported from Malaysia from frsh

water fish-estuarine fish

• Caused deep skin ulcers, inflamatory

• Lesion began on skin surface, deep ulcers

slide6

• Early stages, epithelial edema, loss surface

epithelium, dermal edema with hyperemia &

hemorrhage

• Vibrio the initiator of RSD later digenean

trematode

Miscellaneous pathogens

• from marine to freshwater-- classical oomycete

skin infection-- superficial foci of cottony hyphae

• salmonids, oomycete epidemics associated

slide7

• with ulcerative dermal necrosis (UDN)

• necrosis consist of oomycete Saproglenia

diclina-parasitica

• Exophiala responsible in net cage salmon

• other fungal disease, Aureobasidium in stingray,

Sarcinomyces in black seabream, Cladosporium

in cod, Fusarium in trigger fish and bonnethead

shark