title: The potential for targeted surveillance of live fish movements in Scotland.
abstract: The network structure of the movements of live fish in the Scottish aquaculture industry has recently been demonstrated for 2003. In this paper, we enlarge this analysis to a longer 3-year period from 2002 to 2004, the new data allowing complete coverage of at least one production cycle. The resulting network contains slightly more sites than that for a single year and is denser with more arcs (directed site-to-site connections) present, but otherwise features recognizable in the 1-year network are still recognizable in the 3-year network. Arc-removal algorithms (a proxy for targeted surveillance) were identified that could successfully reduce the portion of the network reachable from a node (a proxy for potential epidemic size) by approximately one-third by removing as few as four arcs. This results from the high centrality of particular nodes and arcs. A strong community structure was identified in the network, corresponding with species farmed, but only weakly geographical, with a high proportion of arcs occurring between management areas and catchments.
authors.affiliation: Institute of Aquaculture, University of Stirling, Stirling, UK. darren.green@stir.ac.uk
authors.forename: D M
authors.initials: DM
authors.lastname: Green
authors.forename: M
authors.initials: M
authors.lastname: Werkman
authors.forename: L A
authors.initials: LA
authors.lastname: Munro
mesh_terms: D000465:Algorithms; D025041:Animal Migration; D000818:Animals; D017756:Aquaculture; D008954:Models, Biological; D011159:Population Surveillance; D012487:Salmonidae / Q000502:physiology*; D012606:Scotland