The present conditions of fishing debris used for marine culture (Net-cage raft and frame, foamed float) were observed visually on the coast of Kagoshima Bay. Foamed floats were classified into three types (Grounded floats, Floats for marine use, and Floats for land use). Grounded floats are grounded foamed floats on the coast. Floats for marine use are foamed floats without covers used for mooring buoys, fenders, and fishing floats on the sea. Floats for land use are foamed floats without covers used or stocked on land.
Grounded floats were observed on the whole coast of Kagoshima Bay. There were a total of 3,043 Grounded floats, and the average density of Grounded floats was 10.3 pieces/km. The highest density fishing district was on Ushine (38.9 pieces/km). The total number of Floats for marine use was 4,856, and the total number of Floats for land use was 1,344. Floats for marine use (80.2%) were used for mooring buoys and fenders of pleasure boats in harbors. The total number of grounded net-cage rafts was 127 pieces, and the total number of frames was 223. These have been mainly grounded around the coast of areas used for agviculture.