Result of an epidemiological study of sea lice infestation in South Connemara, West of Ireland

Sea lice infestation patterns within a bay in Connemara, Co Galway were investigated to elucidate sources of infestation pressure and dynamics of lateral and vertical transmission of infective stages of sea lice within and between sites in a series of complex embayments. Direct measurement of sea lice infestation using sentinel cages and 3D modelling of particle distribution were used to analyse sea lice distribution. The results indicate the potential value of sentinel cages for investigating sea lice transfer between locations within a bay system and shows the potential usefulness of hydrographic modelling in informing choices of site location and sea lice management strategies.

► Sentinel cages and 3D modelling used to analyse sea lice distribution.
► Study looks at use of modelling to inform site location and management strategies.
► Results show a high variability in lice infestation pressure within the bay.
► The model has been validated against measured currents and infestation rates.