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Pacifastacus leniusculus (Dana) and its resistance to the parasitic fungus Aphanomyces astaci Schikora
Persson M and Söderhäll K 
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Abstract
The parasite Psorospermium haeckeli was described as occurring in crayfish as far back as 1857, but was first observed in Finland in the native crayfish Astacus astacus in 1975. In spite of numerous studies, its taxonomic position is still uncertain. The groups to which it has been tentatively assigned include the Protozoa, Trematoda, and Nematoda. Our recent electron microscope studies failed to reveal any features characteristic of one of the above groups. On the other hand, the thick-shelled, spore-like stage occurring in the crayfish showed certain structural similarities to dimorphic pathogenic fungi. Little information is available on the life cycle of the parasite, its possible intermediate hosts, or its significance to the crayfish.
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Persson M and Söderhäll K. (1983). Pacifastacus leniusculus (Dana) and its resistance to the parasitic fungus Aphanomyces astaci Schikora. Freshwater Crayfish 5(1):292-298. doi: 10.5869/fc.1983.v5.292
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