Drifting and grounding of plastic pipes used in oyster farming in the Seto Inland Sea
瀬戸内海に漂流漂着するカキ養殖用パイプ類の実態

SHIGERU FUJIEDA
2011 Nippon Suisan Gakkaishi  
Plastic pipes are a major item of beach litter on the shores of the Seto Inland Sea. They are also frequently seen on the shore of the north Paciˆc. This paper investigates the scattering of plastic pipes on the coast of the Seto Inland Sea. The pipes are used in oyster farming, and are divided into "pipes" about 205 mm long used for hanging, "broken pipes" cut at harvesting time, "short pipes" about 15 mm long used for spat collection and "washers" attached to the end of collectors. Scattered
more » ... lectors. Scattered pipes were collected from 251 beaches, and the locations of drifting pipes on the sea surface were veriˆed by visual observation from a ship. On average, 7.5 short pipes, 4.5 broken pipes and 2.9 pipes were found per m 2 of beach. The discovery rate of pipes, broken pipes and washers on
doi:10.2331/suisan.77.23 fatcat:q4zcgvofrzazvmmyv54gm6nwka