Signs
Infection with Aphanomyces astaci is accompanied by few signs in its early stages, and the first indication of infection may be mortality. In the later stages, the muscles of the tail may appear whitened, or brownish-red where blood cells have encapsulated the hyphae. The effects of the neurotoxins in the oömycete can include appearing in daytime (crayfish are typically nocturnal) and a lack of co-ordination.
Read more about this topic: Crayfish Plague
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—Susan Sontag (b. 1933)