다영양입체양식을 위한 다시마(Saccharina japonica)의 생물여과효과|RISS 상세보기

다국어 초록 (Multilingual Abstract)

To determine whether the seaweed Saccharina japonica can effectively utilize dissolved nutrients from Sebastes schlegeli fish cultures, a laboratory experiment was conducted in a static system for 7 days at ESFRI, NFRDI in Korea. The experiment included an S. schlegeli monoculture system and an S. schlegeli-S. japonica IMTA system. Saccharina schlegeli density (415±24 g; mean±SE) remained the same in all treatments, whereas seaweed density varied across treatments of 0, 0.5, 1, 2, and 3 kg (control and T1-T4, respectively). During the experiment, nutrient (NH4+ and PO43-) concentrations were measured at 24-h intervals. NH4+ concentration of the control group increased from 0.117±0.021 mg/L at the start of experiment to 5.836±0.904 mg/L at the end of experiment. NH4+ concentrations of each treatment were 3.004±0.040,2.086±0.133, 1.642±0.121 and 0.775±0.007 mg/L in T1, T2, T3, and T4, respectively, at the end of experiment. The concentration of PO43- exhibited a similar trend to NH4+ concentration. NH4+ and PO43- concentrations significantly decreased with increased S. japonica thallus density each day (P<0.05). The nutrient removal efficiency (NRE) and nutrient uptake rate (NUR) showed different relationships with changes in thallus density; NRE increased but NUR decreased as thallus density increased. Based on measured concentrations of NH4+ and S. japonica weight, regression analysis defined the relationship between as an exponential function, Y = 3.8165e-0.505X (R2 = 0.9552). Our results demonstrated that S.
japonica can function as an efficient component in IMTA with environmental and potentially economic benefits for fish hatcheries.

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