Aquatic Animal Diseases
Significant to Asia–Pacific
Identification Field Guide
CLICK ON IMAGE TO ENLARGE
Source: T Poppe
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.
Infectious salmon anaemia (ISA) virus is consistent with those of the Orthomyxoviridae family of viruses.
The only species seen to show clinical signs of ISA is the Atlantic salmon (Salmo salar).
Species known to be naturally asymptomatic carriers:
brown trout* (Salmo trutta) - least susceptible
coho trout* (Oncorhynchus kisutch)
rainbow trout* (Oncorhynchus mykiss)
Species shown experimentally to be asymptomatic carriers include:
Atlantic herring (Clupea harengus)
salmon louse (Lepeophtheirus salmonis)
* naturally susceptible (other species have been shown to be experimentally susceptible)
EXOTIC — has not been officially reported in the Asia–Pacific region under the NACA–FAO–OIE quarterly aquatic animal disease reporting program.
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.
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.
For your national emergency disease hotline number, see Whom to contact if you suspect a disease.
The currently accepted procedures for a conclusive diagnosis of ISA are summarised at http://www.oie.int/eng/normes/fmanual/A_00026.htm
These hyperlinks were correct and functioning at the time of publication.