Healthy ocean ecosystems and fisheries are vital to the food security and well-being of much of the world’s population, particularly in developing coastal and island states. The increasing human impact on the underlying natural processes and ecosystems upon which these wide-ranging benefits depend, represents the single greatest threat to the sustainability of fisheries. A large proportion of the world’s fisheries are currently over-exploited, and as a result are underperforming in terms of their full biological and economic potential. Ineffective fisheries management continues to perpetuate these negative outcomes. To-date, a majority of investments in fisheries management improvements have disproportionately depended on public and philanthropic sources of funding, with few cases of private-sector investment being deployed despite the potential upside to fisheries recovery. The latter is at least in part the result of a lack of project pipeline for fisheries investment. The OPP project responds directly to this challenge by providing technical assistance and analytical support to identify and design a series of fisheries investment proposals that are attractive to return-seeking investors. The latter will in-turn catalyze pilot investment into selected transformational public-private partnerships that mainstream the sustainable management of highly migratory fish stocks spanning areas within and beyond national jurisdictions.