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Indonesia possesses one of the world's largest fisheries resources, yet many smallscale fishermen continue to experience poverty and economic vulnerability. Limited ownership of productive assets, restricted access to formal financing, weak bargaining power, and dependence on middlemen have created a cycle of economic dependency that prevents fishermen from improving their welfare. Existing government assistance programs have largely focused on asset distribution without establishing sustainable financing and governance mechanisms. This study develops a cooperative-based productive asset financing model through the integration of Koperasi Desa Merah Putih (KDMP) and Kampung Nelayan Merah Putih (KNMP). Guided by the Five-Stakeholder Innovation Ecosystem Framework, cooperative governance, and sustainable financing concepts, the research employs a qualitative case study approach using focus group discussions, stakeholder interviews, field observations, and secondary data. The findings reveal that fishermen's vulnerability is driven by limited productive assets, dependence on informal financing, weak cooperative institutions, fragmented stakeholder coordination, and limited market access. To address these challenges, the study proposes an integrated ecosystem in which investors finance productive assets, KDMP manages governance and assets, fishermen operate the vessels, and KNMP functions as an off-taker and market integrator. Economic simulations indicate that the model has the potential to improve fishermen's income while providing sustainable returns for investors. The model is considered implementable because it aligns with the government's KDMP and KNMP initiatives, utilizes existing cooperative institutions, and promotes collaboration among government, cooperatives, investors, and universities. Future research should validate the model through pilot implementation and evaluate its long-term socio-economic impacts across different fisheries regions.