Oceans and coastal environments are home to tremendous biodiversity, provide food to over a billion people, and livelihoods for hundreds of millions more. But fisheries are common-pool resources and therefore subject to systematic overexploitation. Economic analysis, in combination with sound biological assessments, can help create the political will and technical knowledge to implement strong fisheries management (or co-management) systems, marine protected areas, and ocean infrastructure that maintain the economic value of fisheries and oceans over the long term. CSF’s Oceans and Fish program provides training for local resource managers and targeted economic analyses to guide public investments and policy decisions.