Bacterial diseases

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Bacteria are probably the most significant pathogens of cultured fish, causing the highest levels of both morbidity and mortality. The rapid expansion of the aquaculture industry over the past two decades has led to a reasonable understanding of the pathogenesis of bacteria causing disease to farmed fish. This chapter examines causal factors, diagnosis and interpretation of results and bacterial pathogens.

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Image of Figure 22.2
Figure 22.2 The problem of bacterial resistance to antibiotics is illustrated by this isolated from a koi, which is resistant to all five antibiotics tested.
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Figure 22.3 The characteristic green pigment that is produced by is fluorescent under ultraviolet light.
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Figure 22.4 The characteristic brown pigment produced by typical isolated from a salmonid. Atypical strains are more commonly isolated from ornamental fish and do not produce pigment.
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Figure 22.5 The growth of dark blue colonies on coomassie brilliant blue agar is characteristic of . (Courtesy of M. Algoet. © W.H. Wildgoose)
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Figure 22.6 Mycobacterial granulomas in (a) anterior and (b) posterior kidney of a goldfish that was sampled from an aquarium experiencing chronic mortalities. Despite the extensive lesions, only a few acid-fast bacteria were found on histological examination. (© W.H. Wildgoose)
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Figure 22.7 Wet preparation revealing colonies of in columns (arrowed), amorphous masses of bacteria attached to pieces of necrotic tissue (× 100 original magnification). (Reproduced with the permission of In Practice.)
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Figure 22.8 Histological section of a gill with epitheliocystis. A large granular basophilic inclusion is seen in an infected epidermal cell (arrowed) (H&E stain, × 400 original magnification). (Courtesy of P. Southgate)

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