Microplastic pollution threatens marine ecosystems and human health through seafood consumption in the Philippines. This study assessed the prevalence, abundance, and morphology of microplastics in the gastrointestinal tracts of Indian squid (Uroteuthis duvaucelii) from two major Bureau of Fisheries and Aquatic Resources – National Stock Assessment Program (BFAR-NSAP) landing sites in Region 1: Tubod, Sto. Tomas, La Union, and Port Sual, Pangasinan. Six specimens (n=3/site) underwent gastrointestinal tract dissection, 10% potassium hydroxide (KOH) digestion at 80°C for 48 hours, density separation, vacuum filtration, Nile red staining, and fluorescence. Prevalence reached 66.67% at Tubod (2/3 samples positive; up to 7 fragments and 6 fibers per specimen) versus 33.33% at Sual (1/3 positive; 3 mixed particles), with non-significant spatial differences (Fisher’s exact test, p=0.52) attributable to limited sample size (n=6). Fragments (50% or total particles; irregular, jagged shapes) and fibers (50% of total particles; linear morphology) dominated, all exhibiting
