Purpose: This community service activity aims to optimizing the governance of fishing community cooperatives in Batu Rusa Village, Bangka Regency. Methodology/approach: Implementation of activities includes observation, socialization, mentoring, as well as monitoring and evaluation which is carried out in a participatory manner by involving cooperative administrators and members. Results/findings: The results of the activities demonstrated an increase in the institutional capacity of cooperatives through the creation of legal documents in the form of notarial deeds, articles of association (AD/ART), governance guidelines, and a financial record-keeping manual. Furthermore, there was an increased understanding among cooperative administrators and members of the importance of transparency, accountability, and professionalism in managing joint ventures. Conclusions: This activity contributes to strengthening the economy of coastal communities by optimizing the governance of fishing cooperation in Batu Rusa Village. Limitations: This activity has limited time and budget, so not all issues within the Batu Rusa Village fishing community cooperative can be resolved. We hope to continue this activity in the future to ensure the sustainability of the Batu Rusa Village fishing community cooperative. Contributions: Batu Rusa Village fishing community cooperative has good legal standing and governance, as well as transparent and accountable financial management guidelines. Furthermore, this activity has been proven to increase the awareness and skills of cooperative members regarding the importance of legality, governance, and sound financial record-keeping for the cooperative's sustainability.