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'''Epidemiology'''
 
'''Epidemiology'''
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*Largely found in salt water
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*Most wild salmonids migrate to the sea for part of their life cycle
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*Sealice numbers are low on wild salmonids (adults only)
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*Sealice numbers are high on farmed salmonids (larvae and adults)
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**90% prevalence
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**Average of 5-10 sealice upon a single fish
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**Most sealice found on dorsal fin, head and back and underside of tail and fins
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**Adults survive for over 3 weeks
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**Migration of larval stages can be up to 1km
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**Larvae locate host by responding to changes in light and vibration
    
'''Pathogenesis'''
 
'''Pathogenesis'''
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*Adults and larval stages are epidermal browsers
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*Mouth tube of toothed ridges abrades fish epidermis
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*Heavy infections leads to:
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**Epidermal abrasion
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**Haemorrhage
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**Immunosuppression
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**Decreased productivity
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**Death
   −
''Control'''
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'''Control'''
 
*Ectoparasites
 
*Ectoparasites
    
*Hidden antigen vaccine
 
*Hidden antigen vaccine
   −
*Wrasse which feed on sea lice
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*Wrasse which feed on sealice
    
*Managment improvements
 
*Managment improvements
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