Planktonic crustaceans were collected monthly around Hamduck, northern part of Cheju Island from April 1989 to March 1990. Occurrence of mean individuals (244 rods. m^(-3)) from inner~ay stations was 2.4 times higher than that (102 rods. m^(-3)) in outer-bay stations. Mean biomass (wet weight, 18.6 mgm^(-3)) from inner-bay stations was 3.6 times higher than that(5.2 mgm^(-3)) in outer-bay ones. The estimated mean values (251.5 ㎍Cm^(-3)d^(-1)) of daily production from inner-bay, having 141.1 ㎍Cm^(-3)d^(-1) of annual mean, was 2.8 times higher than that (90 ㎍Cm^(-3)d^(-1)) in outer-bay. The ratio of daily production of biomass with average value 0.17 suggested a high turnover rate to maintain a temperate costal ecosystems, in spite of a low biomass around Cheju Island.

Marine wastes could be divided into coastal, sink and floating waste by the distribution location. From the results of standing stock estimation of the marine wastes, the amount of coastal waste was similar to the results of previous study, that of sink waste was higher in this study as much as 1.47 to 2.83 times, and that of floating waste was estimated to be higher up to approximately 2.3 times in this study. Overall, the total amount of marine waste in the sea of our country is estimated at 180,148 ~ 331,197 tons, being 1.43 to 2.63 times higher than the results of previous study.