1. MASTS Marine Population Modelling Group; Department of Mathematics and Statistics; University of Strathclyde; Livingstone Tower, 26 Richmond Street Glasgow G1 1XH UK
2. European Commission; Joint Research Centre; Institute for the Protection and Security of the Citizen/Maritime Affairs Unit; 21027 Ispra Italy
3. Marine Scotland Science; Marine Laboratory; PO Box 101 375 Victoria Road Aberdeen AB11 9DB UK