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A review of existing fish assemblage indicators and methodologies

Introduction
Reviewing existing fish-based methods
– Historical background: the original IBI
– Defining a theoretical fish assemblage: « type-specific » vs « site-specific » approaches
– An empirical approach based on fish assemblage conditions
– Explicit approach based on environmmental evaluation
– Using historical data instead of minimally disturbed sites
Considerations in sampling
Identifying the main sources of variability
– Large-scale spatial patterns
– Temporal variability
– Natural vs anthropogenic variability
Reviewing existing fish-based methods in Europe
Overview of metrics used for IBI development worldwide
Metric selection
Conclusion – future needs
Acknowledgements
References