Fungal diseases and harmful algae

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The biological feature that characterizes fungi, above all else, is their osmotrophic (absorptive) mode of nutrition. They can neither ingest their food nor manufacture it in the way that plants do. This chapter discusses saprolegniasis, branchiomycosis, ichthyophonus, dermocystidium and harmful algae.

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Image of Figure 23.1
Figure 23.1 A fancy goldfish with infection. The disease produces a dense mass of cotton wool-like growth when viewed under water. (By permission of .)
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Figure 23.2 The same fish as in Figure 23.1, having been removed from the water. The delicate fungal structure has collapsed into a slimy mass. (By permission of .)
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Figure 23.3 Algae frequently become entrapped in the fungal mass and give the lesion a green coloration, as seen in this goldfish. The epidermis has been lost from the dorsum and is continuing to detach further down the sides of the fish. (© W.H. Wildgoose.)
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Figure 23.4 A wet mount preparation of revealing a tangled network of aseptate hyphae and zoosporangia (arrowed). The latter are not always present in samples from lesions. × 100 original magnification. (Courtesy of Peter Scott.)
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Figure 23.5 A club-shaped zoosporangium of containing primary zoospores. SEM mount, × 1000 original magnification. (Courtesy of Gordon Beakes.)
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Figure 23.6 Cross-section of a granulomatous lesion in the heart caused by infection. There is a chronic inflammatory response surrounding some spores (arrowed). H&E stain, × 100 original magnification. (Courtesy of David Bruno.)
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Figure 23.7 A raised lesion on the operculum of a koi due to infection with koi. Scale in millimetres. (By permission of .)
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Figure 23.8 Strong thick white ‘hyphae’ of plucked from a mature lesion on a koi. Scale in centimetres. (By permission of .)
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Figure 23.9 Spores (S) released from the ‘hyphae’ (H) of . The characteristic spherical spores contain a large central vacuole or refractile body, with the cytoplasm and nucleus restricted to the narrow periphery. They are similar in size to an erythrocyte (E). Wet mount preparation, × 400 original magnification. (By permission of .)
Image of Figure 23.10
Figure 23.10 Histological section of lesion showing ‘hyphae’ (H). The thin-walled hyaline capsules are filled with spores but show little inflammatory reaction in the surrounding tissue. PAS stain, × 400 original magnification. (By permission of .)

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