Sea lice data
See our interactive lice monitoring map for the most up-to-date picture of sea lice levels on wild fish in the sea lochs of lochaber.
Our analysis uses the Taranger et al. (2015) risk assessment framework, which estimates the increased risk of lice-related mortality in sea trout based on the number of lice present relative to fish body weight.
The Taranger risk assessment framework assumes that small sea trout post-smolts will suffer 100% lice-related marine mortality, or premature return to freshwater, if they are infected with >0.3 lice/g fish weight. The lice-related marine mortality is estimated to be 50% if the infection is between 0.2 and 0.3 lice/g, 20% if the infection rate is between 0.1 and 0.2 lice/g, and finally 0% lice-related mortality if the sea lice infection is <0.1 lice/g.
2025 reports
LFT Fisheries Monitoring Annual Report 2025
Atlantic Salmon Genetics Surveillance
