Table 7.1 Principal fungal and related oomycete infections of salmonids
Pathogen
Family
Principal salmonid host
Environment
Saprolegnia spp.
Saprolegniaceae
All
FW
Exophiala salmonis, E. psycrophila
Herpotrichiellaceae
Rainbow trout, Atlantic salmon
SW
Phialophora sp.
Herpotrichiellaceae
Rainbow trout, Atlantic salmon
FW
Isaria farinosa (Paecilomyces farinosus)
Cordycipitaceae
Atlantic salmon parr
FW
Phoma herbarum
Didymellaceae
Chinook salmon fingerlings
FW
FW freshwater, SW sea water
‘He had wet his hand before he touched the trout, so he would not disturb the delicate mucus that
covered him. If a trout was touched with a dry hand, a white fungus attacked the unprotected spot.
Years before when he had fished crowded streams, with fly fishermen ahead of him and behind him,
Nick had again and again come on dead trout, furry with white fungus, drifted against a rock, or
floating belly up in some pool. Nick did not like to fish with other men on the river. Unless they
were of your party, they spoiled it.’
Ernest Hemingway 1927: Big two-hearted river In: The Nick Adams stories
Fig. 7.1 Brook trout with severe Saprolegnia infection following handling
Fig. 7.2 Adult Atlantic salmon returning to spawn in freshwater and infected with Saprolegnia
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7 Fungal and Related Oomycete Infections
Pathogen
Family
Principal salmonid host
Environment
Saprolegnia spp.
Saprolegniaceae
All
FW
Exophiala salmonis, E. psycrophila
Herpotrichiellaceae
Rainbow trout, Atlantic salmon
SW
Phialophora sp.
Herpotrichiellaceae
Rainbow trout, Atlantic salmon
FW
Isaria farinosa (Paecilomyces farinosus)
Cordycipitaceae
Atlantic salmon parr
FW
Phoma herbarum
Didymellaceae
Chinook salmon fingerlings
FW
FW freshwater, SW sea water
‘He had wet his hand before he touched the trout, so he would not disturb the delicate mucus that
covered him. If a trout was touched with a dry hand, a white fungus attacked the unprotected spot.
Years before when he had fished crowded streams, with fly fishermen ahead of him and behind him,
Nick had again and again come on dead trout, furry with white fungus, drifted against a rock, or
floating belly up in some pool. Nick did not like to fish with other men on the river. Unless they
were of your party, they spoiled it.’
Ernest Hemingway 1927: Big two-hearted river In: The Nick Adams stories
Fig. 7.1 Brook trout with severe Saprolegnia infection following handling
Fig. 7.2 Adult Atlantic salmon returning to spawn in freshwater and infected with Saprolegnia
100
7 Fungal and Related Oomycete Infections