Abstract
Distribution and composition of micro （1.0-4.0mm） and meso （4.0-25.0mm） plastic debris were investigated on 20 beaches of Ago Bay and Gokasho Bay， Mie Prefecture， in September 2014. The total of collected plastic debris were 111,080 items and the plastic fragments accounted for 98.1% of the total number. Micro plastic debris accounted for 89.9% of total number and the average densities were 34,713 pieces per m2. Micro and meso plastic debris of average densities over 50 pieces per m2 were seven items and these were consisted by foamed plastic fragments （96.5%）, capsule of chemical fertilizers （1.6%）, hard plastic fragments（0.7%）, line fragments（0.3%）, plastic film fragments（0.2%）, resin pellets（0.2%） and tips of synthetic lawn（0.1%）. The maximum density of foamed plastic fragments was at Yadoura（158,602 pieces per m2） and the average density（33,499 pieces per m2） was about ten times for the beaches of Ise Bay.
