Abstract
We assessed the function of a Patinopecten yessoensis and Saccharina japonica integrated multi-trophic aquaculture (IMTA) model on the level of organic matter produced in the environment. The study was conducted in March-July 2012 using stable carbon and nitrogen isotope methods. Results showed that the quantity of rotten kelp increased considerably over these 5 months, with the length of the rotten blades reaching 150 cm in July. The contribution rates of biodeposits by the shellfish and kelp to the suspended particulate matter (SPM) were 3.93 +/- A 0.39 and 4.99 +/- A 1.09 %, respectively, but contribution rates to the sediments in the IMTA area were very low. In May and July, rotting kelp contributed 1.06 +/- A 0.46 and 1.64 +/- A 0.13 % in the kelp area, respectively. The organic carbon and nitrogen content of sediments from the IMTA area was significantly higher than from the kelp area (P < 0.05). C% and N% in SPM from the IMTA area were four times those from the kelp area (P < 0.05), but the C and N content in sediments were still at a low level.
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