they suggest a unified framework approach to forecasting the implications of climate changes for marine fish production which involves i identifying relevant mechanisms ii conducting a feasibility assessment of the implications of downscaling climate scenarios iii evaluating climate model scenarios and selecting intergovernmental panel on climate change ipcc models iv extracting environmental variables from climate scenarios and incorporating them into projection models and v evaluating fish and shellfish production under a changing ecosystem recently zhang et al according to the food and agriculture organization s fao exploitation state summary of assessed stocks were fully exploited or overfished depleted or recovering kelleher