Ecosystem-based management objectives for the North Sea: riding the forage fish rollercoaster

The North Sea provides a useful model for considering forage fish within ecosystem based management as it has a complex assemblage of forage fish species. This paper is designed to encourage further debate and dialogue between stakeholders about management objectives. Changing management of fisheries on forage fish will have economic consequences for all fleets in the North Sea. The predators that arevulnerable to depletion of forage fish are sandwich terns, Great skua and common guillemots, and to a lesser extent marine mammals. Comparative evaluations of management strategies are required to consider whether maintaining reserves of prey biomass or a more integral approach of monitoring mortality rates across the trophic system, is more robust under the ecosystem approach.In terms of trophic energy transfer, stability and resilience of the ecosystem, forage fish should be considered as both a sized-based pool of biomass and as speciescomponents of the system by managers and modellers. Policy developers should not consider the knowledge base robust enough to embark on major projects of ecosystem engineering. Management plans appear able to maintain sustainable exploitation in the short term. Changes in the productivity in forage fish populations are inevitable so management should remain responsive and adaptive.JRC.G.4-Maritime affair