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자료유형
학술저널
저자정보
저널정보
한국수산과학회 양식분과 한국양식학회지 한국양식학회지 제16권 제3호
발행연도
2003.8
수록면
171 - 178 (8page)

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Inorganic nutrients such as nitrogen and phosphate compounds accumulate in recirculating aquaculture systems. These nutrients must be removed from the system before they affect pH and fish health. For this purpose, aquatic plants are a simple and inexpensive method of removal. There are four commonly used aquatic plants: Eichhornia crassipes (water hyacinth), Pistia stratiotes (water lettuce), Hygrophila angustifolia, and Hydrocotyle leucocephala in freshwater recirculating aquaculture systems in Korea, but their efficiencies are not known. Therefore, removal efficiencies of inorganic nutrients from a freshwater recirculating aquaculture water with four commonly used aquatic plants were tested. Removing efficiencies of TAN, NO₂ ̄-N, and NO₃ ̄-N of the plants in 210 L aquaria for 48-hour period were tested. The removing efficiencies of TAN, NO₃ ̄-N, and PO₄³ ̄-P of the two most effective plants, water hyacinth and water lettuce, were also tested in 690 L (surface area of 1.55 ㎡) tanks under 2 different initial stocking densities, 4 ㎏ and 6 ㎏, for 22 days. Proximate analysis major nutrients and N and P contents of the all plants were analyzed for calculating net removal weight of N and P by the plants. Water lettuce was the most effective for removing TAN, NO₂ ̄-N, and NO₃ ̄-N from the water for 48-hour period tested followed by water hyacinth and Hygrophila angustifolia. Water lettuce reduced TAN, NO₂ ̄-N, and NO₃ ̄-N concentration from 2.3 ㎎/L, 0.197 ㎎/L, and 21.4 ㎎/L to 0.4 ㎎/L, 0.024 ㎎/L and 17.4 ㎎/L, respectively while water hyacinth reduced them down to 0.6 ㎎/L, 0.029 ㎎/L and 17.9 ㎎/L, respectively. The concentrations of TAN, NO₂ ̄-N, and NO₃ ̄-N in Hydrocotyle leucocephala group were rather increased up to 3.7 ㎎/L, 5.7 ㎎/L and 48.2 ㎎/L, respectively. This is because the creeping stem of Hydrocotyle leucocephala had to be cut to meet stocking weight resulting in decaying of the stem in the aquaria during experiment. The net growth in weight of water hycinth and water lettuce of 4 ㎏ each in the 1.55 ㎡ tanks for 22 days were 9.768 ㎏ and 10.803 ㎏ respectively, and those at initial weight of 6 ㎏ each were 8.393 ㎏ and 9.433 ㎏, respectively. The reason of lower net growth in the later group was restricted growth space. Nitrogen and phosphorus contents in water hyacinth were 2.89% and 0.27%, and those in water lettuce were 3.87% and 0.36%, respectively. Average quantities of removed N and P from 1.55 ㎡ tanks by water hyacinth for 22 days were 18.9 g and 1.75 g, while those by water lettuce were 36.8 g and 3.5 g, respectively. Therefore water lettuce showed much higher efficiencies for removing both N and P from recirculating aquaculture water than water hyacinth.

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