The ascidian Styela clava has been one of the favorite seafood in Korea. Suspended culture of Styela
clava was initiated in 2001 and the annual production reached 15,084 M/T, but declined to 2,655 M/T in 2011. In
order to solve this problem, it is necessary to estimate the material balance according to the farm-environment.
Vertical particulate fluxes and release fluxes were estimated at 2 stations, an ascidian farm (AF) and a
non-cultivated area (control) in Jindong Bay. An in-situ benthic chamber(BelcI) was used in summer and winter
season. The sedimentation fluxes of organic carbon were 72 mmol C m-2 d-1, 93 mmol C m-2 d-1, 34 mmol C m-2
d-1 in Jul. AF, Feb. AF, Feb. control. The organic carbon oxidation rates were 13 mmol C m-2 d-1, 81 mmol C m-2
d-1, 31 mmol C m-2 d-1, in each. The release fluxes of nutrients followed the general pattern, well. Consequently,
the ratio of the organic carbon burial fluxes were 20:4:1, in each. By the estimation of the carbon circulation, it
could be a scientific basis to analyze the reason of production decline for cultivated organism.