Haemorrhaging in the mouth Essentially generalised haemorrhaging

Haemorrhaging in the mouth essentially generalised

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Haemorrhaging in the mouth Essentially, generalised haemorrhaging (Figures 6.3, 6.4 [see colour section]) or discrete blood spots become apparent on or around the mouth; a phenomenon attributed to infection by Aeromonas sp., Ps. anguilliseptica, Shewanellaputrefaciens, V. anguillarum, V. ordalii and Y. ruckeri. Erosion of the jaws/mouth This condition occurs principally with infections by Aer. bestiarum/hydrophila (Figures 6.5-6.7 [see colour section]), Fla. Johnsoniae, T. maritimum and Y. ruckeri. Haemorrhaging in the opercula region/gills This occurs with infections by Chrys. scophthalmum, Lactococcus garvieae, Ps. anguilliseptica, Sta. epidermidis. Streptococcus spp. and Vag. salmoninarum. Gill damage This includes the presence of swollen gill lamellae, anaemia/pale gills, clubbing and gill rot, which are symptoms of gill disease, caused by Bac. cereus, Bac. mycoides. Arc. cryaerophilus, Chrys. scophthalmum, Esch. vulneris, Fla. branchiophilum, Fla. colum- nare, Fla. hydatis, J. lividum. Micrococcus luteus. Mycoplasma mobile, Myxococcus piscicola, Piscirickettsia salmonis, Planococcus sp., V. alginolyticus, V. anguillarum and V. ordalii.
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Diagnosis 191 White nodules on the gills/skin This is one of the characteristics of infections by Edw. tarda and V. fischeri. White spots on the head This occurs with infection by Planococcus sp. Fin rot/damage The presence of badly damaged (rotted) fins may be a sign of infection by Aer. hydrophila, Arc. cryaerophilus, Klebsiella pneumoniae, Mycobacterium spp., Nocardia spp., Ps.fluorescens, Shewanella putrefaciens and V. pelagius. Haemorrhaging at the base of fins The presence of clusters of tiny haemorrhagic lesions at the base of the fins is associated with disease caused by Aer. hydrophila, Lactococcus garvieae, Ps. fluor- escens, Streptococcus spp., V. anguillarum, V. ordalii, V. pelagius, V. splendidus and Y. ruckeri. Haemorrhaging on the fins This occurs with infections caused by Aeromonas sp. (Figure 6.8 [see colour section]), Sta. epidermidis and Str. parauberis. Tail rot/erosion This occurs with infection by Aeromonas sp. (Figure 6.9 [see colour section]), T. maritimum, Klebsiella pneumoniae, Mycobacterium spp., Nocardia spp., Ps.fluor- escens and Y. intermedia. Saddle-like lesions on the dorsal surface (columnaris, saddleback disease) This condition develops with infections by Fla. columnare (Figure 6.10 [see colour section]), Fla. psychrophilum and Sporocytophaga sp. Distended abdomen This condition, where the abdomen is often filled with ascitic fluid, should not be confused with overfeeding. The presence of a distended abdomen is a sign of many diseases, including those caused by Aer. hydrophila, Aer. salmonicida. Car. piscicola, Chrys. scophthalmum, Edw. ictaluri, Edw. tarda, J. lividum, Lactobacillus spp., Lactococcus garvieae, Lactococcus piscium. Micrococcus luteus, Myc. abscessus, Ps.
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192 Bacterial Fish Pathogens chlororaphis, Ps. fluorescens, Ren. salmoninarum (Figure 6.11 [see colour section]), Sta. warneri, Streptococcus spp., Vag. salmoninarum and V. splendidus.
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