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Diseases of crustaceans

Viral diseases—Infectious myonecrosis

CLICK ON IMAGE TO ENLARGE Infectious myonecrosis Infectious myonecrosis

Infectious myonecrosis Infectious myonecrosis

Gross signs of infectious myonecrosis in naturally infected farmed Pacific white shrimp (P. vannamei), exhibiting various degrees of skeletal muscle necrosis, visible as an opaque, whitish discolouration of the abdomen

Source: DV Lightner

Signs of disease

Important: animals with disease may show one or more of the signs below, but disease may still be present in the absence of any signs.

Disease signs at the farm level
Clinical signs of disease in an infected animal

Disease agent

The causative agent is infectious myonecrosis virus, an RNA virus.

Host range

Crustaceans known to be susceptible to infectious myonecrosis:
white shrimp* (Penaeus vannamei)
tiger prawn (Penaeus monodon)
blue shrimp (Penaeus stylirostris)

* naturally susceptible (other species have been shown to be experimentally susceptible)

Presence in Asia–Pacific

Map showing presence in Asia–Pacific

Infectious myonecrosis has been officially reported from Indonesia.


Differential diagnosis

The differential diagnostic table and the list of similar diseases appearing at the bottom of each disease page refer only to the diseases covered by this field guide. Gross signs observed might well be representative of a wider range of diseases not included here. Therefore, these diagnostic aids should not be read as a guide to a definitive diagnosis, but rather as a tool to help identify the listed diseases that most closely account for the gross signs.

Similar diseases

White tail disease

Further images

Sample collection

Because of uncertainty in differentiating diseases using only gross signs, and because some aquatic animal disease agents might pose a risk to humans, you should not try to collect samples unless you have been trained. Instead, you should phone your national hotline number and report your observations. If samples have to be collected, the agency taking the call will advise you on what you need to do. Local or district fisheries/veterinary authorities could advise you on sampling.

Emergency disease hotline

For your national emergency disease hotline number, see Whom to contact if you suspect a disease.

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