EFI+ Project. Improvement and spatial extension of the European Fish Index Deliverable 4.1 : Report on the modelling of reference conditions and on the sensitivity of candidate metrics to anthropogenic pressures. Deliverable 4.2: Report on the final development and validation of the new European Fish Index and method, including a complete technical description of the new method. 6th Framework Programme Priority FP6-2005-SSP-5-A. N° 0044096. Rapport final