Using Dispersal Modelling Connectivity Outputs to Produce a Meta-population Model of Salmon Lice on Farms in Loch Linnhe. Nabeil KG Salama Marine Scotland Science
[email protected]
INTRODUCTION
Connectivity (p)
• Loch Linnhe : Scotland’s largest fjord • Ten salmon farms + side loch farms • Two Management areas • Coordinated practices • Important wild fish run (Lochy) • Bio-physical model • 100 m x 100 m • Tides, freshwater, winds • Lice Mature 10% h -1 • Death 1% h -1 • Run for 19d May & Oct 2011 – 2013 • Assessed against physical & Map of Loch Linnhe on the Scottish biological observations west coast • Site monthly biomass reported aquaculture.scotland.gov.uk
• Lice particles released from 12 sites • (5 particles 0.5h -1 ) • Weighted by farm observations • Record the proportion of copepodid lice recorded at neighbouring sites + 500m • Mean across all simulation Range P : 10-6 – 10-2
AIM Establish Connectivity probabilities to drive a meta• population model for informing salmon lice management
POPULATION MODEL Temperature (T) mediated: • Maturation (m) settlement (s), egg production (λ) salmon lice sources: • wild salmon, neighbours, internal Treatment parameters: • Efficacy, Thresholds
s
Chalimus
p λ Gravid Eggs
Regime A Treatment level: 0.5 gravid Efficacy : 0.5
Vertical dotted lines = wild salmon returns
m
m
Regime B Treatment level: : 1 gravid Efficacy : 0.7
Connectivity between sites: red p>10-5 green p
