The purpose of the proposed work is to assess and enhance the performance of the coastal fisheries and mariculture sector in addressing plastics pollution relating to Abandoned; Lost; or otherwise Discarded Fishing Gear (ALDFG) and other plastics used for harvesting in the Philippines; Thailand; and Viet Nam.To this end; the study aims to provide a better understanding of the contribution of coastal fisheries and mariculture to regional marine plastic pollution and to provide recommendations that help strengthen national and regional policies aimed at reducing ALDFG and other marine-based plastic pollution from the fisheries sectors of the Philippines; Thailand and Viet Nam. The specific objectives are as follows:* a) To review existing ALDFG data and identify/apply appropriate methods in each of the 3 countries to ensure comprehensive national baseline assessments on ALDFG and other marine plastics used in coastal fisheries and mariculture.* b) To develop a cumulative situational analysis of the extent of ALDFG and other marine plastics used in coastal fisheries and mariculture at a sub-regional level.* c) To develop GIS-based heatmaps to identify hotspots of ALDFG and other marine plastics.* d) To conduct detailed legal; policy and institutional analysis to:i. deliver a comprehensive gap analysis of the legal; regulatory and policy frameworks of the three countries; relating to the governance of ALDFG.ii. identify potential circular economy solutions to address plastic leakage and pollution from coastal fisheries and mariculture; in addition to areas for regional-level collaboration.iii. Identify institutional and investment opportunities to improve identification; registration; monitoring; and enforcement across the coastal fishery fleets in each of the 3 countries with the aim of reducing ALDFG. * e) To create an action plan to address marine plastic pollution from coastal fisheries and mariculture in each of the 3 countries; outlining a roadmap for successful implementation.* f) To disseminate the results of this study across the 3 countries and the wider SE Asia region and support them in adopting and informing their positions with respect to negotiations on the Global Plastics Treaty.