From Fish-Landing Inventories to Microplastic Monitoring: Development of a Proposed Surveillance Protocol for Pasacao, Philippines

Background: Fish-landing inventories may provide an entry point for local microplastic monitoring, but their suitability depends on traceable sampling and analytical quality assurance. Objective: To assess the documentation readiness of a Pasacao, Camarines Sur fish-landing study and specify a prospective microplastic surveillance protocol. Methods: A revision-stage documentary appraisal of a 2026 graduate thesis examined its species inventory, landing-site sampling description, laboratory procedures and supporting appendices. Source statements were classified by documentary status and mapped to requirements for repeatability, biological replication, contamination control, polymer confirmation and reporting. No new field or laboratory observations were generated. Results: The source reported 17 landed taxa, provisional feeding-guild labels and chemical analysis involving three selected taxa. Although composite preparation was specified, the accessible records did not establish the numbers of independently processed samples. Fish-capture provenance, sampling denominators and particle-level confirmation remained incompletely reported. The proposed architecture differentiates Tier A landing registration and biological sampling, Tier B1 laboratory screening and quality control, and Tier B2 spectroscopic confirmation. A prospective pilot-evaluation matrix specifies coverage, workload, cost, recovery, reproducibility and reporting performance. Conclusion: The inventory can inform protocol design but cannot establish monitoring feasibility, geographic contamination levels or feeding-guild differences. Prospective assessment is required before routine adoption.